WO2011054160A1 - Method and system for digital demodulation error parameter measurement based on continuous wave combination approach - Google Patents
Method and system for digital demodulation error parameter measurement based on continuous wave combination approach Download PDFInfo
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- WO2011054160A1 WO2011054160A1 PCT/CN2009/075137 CN2009075137W WO2011054160A1 WO 2011054160 A1 WO2011054160 A1 WO 2011054160A1 CN 2009075137 W CN2009075137 W CN 2009075137W WO 2011054160 A1 WO2011054160 A1 WO 2011054160A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
- H04L27/3863—Compensation for quadrature error in the received signal
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- the invention relates to the measurement of digital demodulation error parameters, in particular to a digital demodulation error parameter measurement method and system based on continuous wave combination method. Background of the invention
- EvmRms error vector magnitude rms value
- EvmPeak error vector amplitude peak
- MagErrRms amplitude error rms value
- MagErrPeak amplitude error peak
- phaseErrPeak phase error mean square
- PhaseErrRms phase error peak
- FrequencyErr frequency error
- VSA vector signal analyzer
- the above measurement process is obviously a closed-loop mutual measurement process, and it is a non-traceable closed-loop mutual test.
- the process is the "castle in the air" in the measurement system. That is to say, the error parameters obtained by the current digital modulation error parameter measurement are not traceable, which is difficult to ensure the accuracy and credibility of the measurement process.
- the digital modulation signal used to calibrate the VSA lacks the setting of the error parameters.
- digitally modulated signals are often subject to errors due to interference from multiple factors, and the error is not a fixed value. Therefore, in order to ensure that the VSA can accurately measure the individual error parameters of the digital modulation signal, the error parameters of the digital modulation signal used as the calibration VSA standard should be configurable within a certain range. However, the current calibration method does not set the error parameters, which is required for practical applications away from the digital modulation error parameters. Summary of the invention
- embodiments of the present invention provide a digital demodulation error parameter measurement method and system, which can generate an equivalent digital modulation signal traceable by an error parameter as a standard signal for calibrating a VSA, to completely solve the digital demodulation error parameter measurement.
- the accuracy and credibility of the process can be implemented using a digital demodulation error parameter measurement method and system, which can generate an equivalent digital modulation signal traceable by an error parameter as a standard signal for calibrating a VSA, to completely solve the digital demodulation error parameter measurement.
- the digital demodulation error parameter measurement method provided by the embodiment of the present invention includes: generating a continuous wave signal whose carrier frequency is the sum or difference of the first frequency and the second frequency, wherein the first frequency is greater than the second frequency;
- the generated continuous wave signal is input to the input end of the VSA as an equivalent digital modulation signal, wherein the carrier frequency of the VSA is set to the first frequency, the demodulation mode is set to the M-ary phase shift keying MPSK, and the symbol rate is set to M times the second frequency, where M is a positive integer.
- a digital demodulation frequency error parameter measurement method includes: Generating a continuous wave signal having a carrier frequency of a sum of a first frequency and a second frequency and a difference between the error frequency and the error frequency, wherein the first frequency is greater than the second frequency, and the error frequency is less than one-half of the second frequency;
- the generated continuous wave signal is divided into a continuous wave signal and a continuous wave signal by a power splitter;
- the chopped continuous wave signal is input as an equivalent digital modulation signal to the input end of the vector signal analyzer VSA, and the measured value of the frequency error of the equivalent MPSK signal of the chopper continuous wave signal is obtained, wherein the carrier frequency of the VSA is set to be the first Frequency, the demodulation mode is set to MPSK, the symbol rate is set to ⁇ times the second frequency, where ⁇ is a positive integer; the B continuous wave signal is input to the frequency meter to obtain the frequency value measured by the frequency meter, and according to the frequency The measured frequency value is used to calculate the actual value of the frequency error; and the VSA is calibrated based on the actual value pair of the frequency error and the measured value of the frequency error obtained by the VSA measurement.
- the actual value of the above frequency error is the difference between the frequency value measured by the frequency meter minus the sum or difference of the first frequency and the second frequency.
- the method further includes: after combining the first continuous wave signal and the second continuous wave signal into one combined signal, calculating an error parameter of the equivalent MPSK signal of the synthesized signal; after receiving the synthesized signal, the VSA is measured
- the composite signal is equivalent to an error parameter of the MPSK signal, and the VSA is calibrated according to the calculated error parameter of the equivalent MPSK signal of the composite signal and the measured error parameter.
- the error parameter includes: an error vector magnitude rms value EvmRms; the calculating an error parameter of the composite signal equivalent MPSK signal comprises: calculating EvmRms of the composite signal equivalent MPSK signal according to the following formula: EvmRms 2 - 2.
- the above error parameters include: amplitude error rms value MagErrRms; the error parameter of the synthesized signal equivalent MPSK signal includes: Ma ErrRms of the synthesized signal equivalent MPSK signal according to the following formula:
- the error parameter includes: a phase error root mean square value PhaseErrRms; the calculating an error parameter of the composite signal equivalent MPSK signal includes: calculating according to the following formula The synthesized signal is equivalent to the PhaseErrRms of the MPSK signal:
- the ISR is the ratio of the power of the second continuous wave signal to the power of the first continuous wave signal.
- the ISR is the ratio of the power of the second continuous wave signal input to the VSA to the power of the first continuous wave signal.
- the above is less than -8 dB; and if the number of symbols used for statistical analysis in the VSA is Nx M , Wy3 ⁇ 4 is an integer, where A is the ratio of the third frequency to the second frequency.
- Embodiments of the present invention provide a digital demodulation error parameter measurement system, including: a continuous wave signal generator for generating a continuous wave signal having a carrier frequency of a sum or a difference between a first frequency and a second frequency, wherein the first The frequency is greater than the second frequency;
- the vector signal analyzer VSA is used for receiving the continuous wave signal generated by the continuous wave signal generator, and measuring the error parameter of the equivalent MPSK signal of the received continuous wave signal. When the continuous wave distortion is small, it can be considered as such.
- the digital modulation error parameter of the MPSK signal is zero.
- the carrier frequency of the VSA is set to the first frequency
- the demodulation mode is set to MPSK
- the symbol rate is set to ⁇ times the second frequency, where ⁇ is a positive integer.
- Embodiments of the present invention provide a digital demodulation frequency error parameter measurement system, including: a continuous wave signal generator, configured to generate a continuous wave signal having a carrier frequency of a sum of a first frequency and a second frequency and a sum of a difference and an error frequency, wherein the first frequency is greater than the second frequency; preferably, the error frequency is less than One-half of the two frequencies.
- a power splitter for dividing the continuous wave signal generated by the continuous wave signal generator into a chopped continuous wave signal and an E continuous wave signal
- the vector signal analyzer VSA is configured to receive the chopped continuous wave signal, measure the frequency error of the equivalent cue phase shift keying MPSK signal of the received chopped continuous wave signal, and obtain a measured value of the frequency error, wherein the carrier frequency of the VSA Set to the first frequency, the demodulation mode is set to MPSK, and the symbol rate is set to M times of the second frequency, where M is a positive integer;
- the frequency meter is used to receive the continuous wave signal of the B road and measure the frequency value of the continuous wave signal of the B road.
- the above system further includes: an atomic clock for providing a stable clock signal to the continuous wave signal generator and the frequency meter, wherein the atomic clock is a helium atomic clock.
- Embodiments of the present invention provide another digital demodulation error parameter measurement system based on continuous wave combination method, including:
- a first continuous wave signal generator configured to generate a first continuous wave signal whose carrier frequency is a sum or a difference between the first frequency and the second frequency, wherein the first frequency is greater than the second frequency;
- a second continuous wave signal generator configured to generate a second continuous wave signal whose carrier frequency is a sum or a difference between the first frequency and the third frequency, wherein the first frequency is greater than the third frequency; and the recommended value is that the second frequency is greater than the third frequency frequency.
- a combiner for synthesizing the first continuous wave signal generated by the first continuous wave signal generator and the second continuous wave signal generated by the second continuous wave signal generator to obtain a composite signal
- a vector signal analyzer VSA for receiving a composite signal output from the combiner, measuring an error parameter of the equivalent MPSK signal of the received composite signal, wherein the carrier frequency of the VSA
- the rate is set to the first frequency
- the demodulation mode is set to MPSK
- the symbol rate is set to M times the second frequency, where M is a positive integer.
- the digital demodulation error parameter metering system further includes: a first isolator connected between the first continuous wave signal generator and the combiner for isolating the first continuous wave signal generator and the second continuous wave signal; The isolator is connected between the second continuous wave signal generator and the combiner for isolating the first continuous wave signal generator and the second continuous wave signal.
- the digital demodulation error parameter metering system further includes: an attenuator connected between the second continuous wave signal generator and the combiner or connected between the second isolator and the combiner for adjusting the output of the second continuous wave signal to The power of the VSA.
- the present invention provides an equivalent digital modulated signal with error, and the six error parameters of the digital modulated signal are EvmRms, EvmPeak, MagErrRms,
- MagErrPeak, PhaseErrRms, and PhaseErrPeak can be accurately set and calculated. Since the error parameter of the digitally modulated signal can ultimately trace the power ratio of the two continuous wave signals, the vector can be accurately calibrated using the signal. Therefore, the present invention can solve both the problem of metering traceability and error setting.
- FIG. 2 is a flowchart of a digital demodulation error parameter measurement method according to another embodiment of the present invention.
- FIG. 3 is a flowchart of a method for measuring a digital demodulation error parameter according to still another embodiment of the present invention
- FIG. 4 is a schematic structural diagram of a digital demodulation error measurement system according to an embodiment of the present invention
- FIG. 5 is a schematic structural diagram of a digital demodulation error measurement system according to another embodiment of the present invention
- FIG. 6 is a schematic structural diagram of a digital demodulation error measurement system according to still another embodiment of the present invention.
- Figure 7 shows the calculated and measured values of the error parameter EvmRms of the equivalent MPSK signal after combining two continuous wave signals under different ISRs
- Figure 8 shows the calculated and measured values of the error parameter EvmPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals
- Figure 9 shows the calculated and measured values of the error parameter MagErrRms of the equivalent MPSK signal after combining two continuous wave signals under different ISRs
- Figure 10 shows the calculated and measured values of the error parameter MagErrPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals
- Figure 1 shows the calculated and measured values of the error parameter PhaseErrRms of the equivalent MPSK signal after the combination of the two lower continuous wave signals.
- Figure 12 shows the calculated and measured values of the error parameter PhaseErrPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals.
- the embodiment of the present invention provides a digital demodulation error parameter measurement and calibration method. As shown in FIG. 1 , the method mainly includes :
- Step 1 11 Generate a carrier frequency of the sum of the first frequency and the second frequency / + + / ⁇ or The continuous wave signal c c (t) of the difference ⁇ - , , wherein the first frequency ⁇ is greater than the second frequency ⁇ ; it should be noted that the first frequency and the second frequency ⁇ are both positive values in this step.
- the continuous wave signal generated by the above step 1 1 can be expressed by the following formula (1):
- Step 1 12 Input the generated continuous wave signal as an equivalent digital modulation signal to
- the input end of the VSA wherein the carrier frequency of the VSA is set to the first frequency ⁇ , the demodulation mode is set to the binary phase shift keying (MPSK), and the symbol rate is set to the second frequency ⁇ times Mf b , where M is a positive integer.
- MPSK binary phase shift keying
- the embodiment of the present invention also provides a digital demodulation frequency error parameter measurement method, which can measure the frequency error FrequencyErr of the digital modulation signal, as shown in FIG. 2,
- the method mainly includes: Step 121: generating a continuous wave signal with a carrier frequency of a sum of a first frequency and a second frequency ⁇ and a sum of an error frequency/ ⁇ , wherein the first frequency ⁇ is greater than the second frequency ⁇ , and
- Step 122 The generated continuous wave signal is divided into a continuous wave signal and a continuous wave signal of the B through the power splitter.
- Step 123 Input the chopped continuous wave signal to the input end of the vector signal analyzer VSA to obtain a measured value f ED of the frequency error of the equivalent MPSK signal of the compulsory continuous wave signal, wherein the carrier frequency of the VSA is set to the first frequency
- the demodulation mode is set to MPSK, and the symbol rate is set to ⁇ times the second frequency, where ⁇ is a positive integer.
- Step 124 Input the continuous wave signal of the B path to the frequency meter to obtain the frequency value /: measured by the frequency meter, and calculate the actual value of the frequency error according to the frequency value measured by the frequency meter.
- Step 125 Calibrate the VSA based on the actual value pair of the frequency error and the measured value of the frequency error measured by the VSA.
- the frequency error of the equivalent MPSK signal of the chopped continuous wave signal is related to the error frequency / £S , which can be set by the error frequency / £S .
- the continuous wave signals generated in the above steps 111 and 121 are equivalent to the MPSK signal after being demodulated by the VSA, and are capable of traversing all the symbol points on the MPSK signal.
- the continuous wave signal generated in step 111 is exemplified as follows:
- a vector circle rotating at an angular velocity is represented. If the vector circle is sampled at a rate, the constellation point formed is a vector circle with a regular square shape. A vertice. If the VSA has an MPSK demodulation mode built in, the M sample constellation points can be synchronized to the design constellation point by carrier phase synchronization and symbol synchronization.
- the single carrier signal with a frequency of ⁇ can be equivalent to the MPSK signal with the carrier frequency of the symbol rate ⁇ Baud (Baud), and the symbol sequence is sequentially taken along the MPSK design constellation point instead of random. Value.
- the above equivalent MPSK signal is essentially a continuous wave signal, and if the continuous wave signal is low distortion, the modulation error of this equivalent MPSK signal can be considered to be close to zero. Therefore, traceable calibration can be implemented for the VSA using this equivalent MPSK signal, typically using binary phase shift keying (2PSK), quaternary phase shift keying (4PSK), and octal phase shift keying (8PSK). .
- 2PSK binary phase shift keying
- 4PSK quaternary phase shift keying
- 8PSK octal phase shift keying
- the error parameter of the above equivalent MPSK signal is fixed and cannot be set.
- the embodiment of the invention also provides a digital demodulation error parameter measurement method, which is also called a digital demodulation error parameter measurement method based on the continuous wave combination method. As shown in FIG. 3, the method mainly includes:
- Step 21 Generate a first continuous wave signal c cl W whose carrier frequency is the sum of the first frequency and the second frequency + + / ⁇ or difference - ,, wherein the first frequency is greater than the second frequency / ⁇ .
- Step 22 Generate a second continuous wave signal C C2 (t) whose carrier frequency is the sum of the first frequency and the third frequency ⁇ + ⁇ or the difference - ⁇ , wherein the first frequency is greater than the third frequency
- the second continuous wave signal C C2 (t) generated by the above step 22 can be expressed by the following formula (3):
- Step 23 Combine the first continuous wave signal C C1 (t) and the second continuous wave signal C C2 (t) into one combined signal as an equivalent number
- the modulation signal is input to the input end of the VSA, wherein the carrier frequency of the VSA is set to the first frequency ⁇ , the demodulation mode is set to MPSK, and the symbol rate is set to M times of the second frequency /, where M is a positive integer.
- the merging described in this step refers to adding the first continuous wave signal C cl (t) and the second continuous wave signal C C2 (t).
- a combiner can be used. Combine two continuous wave signals.
- A is a positive number less than 1,
- V ⁇ t) exp(72 ⁇ t + ⁇ ⁇ ) + lSR ⁇ V (j2 M b t + ⁇ 2 ) (4) If the number of symbols used for statistical analysis in the VSA is NxM, then In this embodiment, the sampling time of the VSA is required to be an integral multiple of two component periods of the above formula (4), that is, the sampling time of the VSA is (j2Kf b t + (Pl , the period and An integer multiple of the period of +), that is, ⁇ 3 ⁇ 4 is an integer, and the larger the value, the better.
- the above composite signal can be equivalent to an MPSK signal with error, and EvmRms, EvmPeak, MagErrRms, MagErrPeak of the equivalent MPSK signal, PhaseErrRms, PhaseErrPeak, can be accurately set and calculated.
- the accuracy of the VSA measurement is affected, and therefore, it should be guaranteed to be less than a certain threshold, and preferably, it should be guaranteed /57? ⁇ -8 ( 1 ⁇
- the VSA's demodulation bandwidth span is recommended to be set to 3 ⁇ .
- the above-mentioned synthetic signal equivalent MPSK signal MagErrRms can pass the following formula MagErrRms 2 (1 + ISR ) -
- PhaseErrRms of the above synthetic signal equivalent MPSK signal can be as follows
- the PhaseErrPeak of the above synthetic signal equivalent MPSK signal can be calculated by the following formula (9):
- the error parameters PhaseErrRms, PhaseErrPeak, MagErrRms, EvmRms, MagErrPeak and EvmPeak of the above-mentioned composite signal equivalent MPSK signal are the power of the second continuous wave signal and the power of the first continuous wave signal included in the synthesized signal.
- Ratio /5? Related, and /5? It can be traced to the high frequency power standard, that is, the error parameter of the synthetic signal equivalent MPSK signal generated by the above method is traceable. And, by adjusting, the equivalent of the generated synthetic signal can be achieved.
- the error parameters of the MPSK signal are PhaseErrRms, PhaseErrPeak, MagErrRms, EvmRms, MagErrPeak and EvmPeak settings.
- step 24 may be further performed: calculating error parameters of the equivalent MPSK signal of the composite signal according to the above formulas (4) to (8), including: PhaseErrRms, PhaseErrPeak, MagErrRms, EvmRms, MagErrPeak, and EvmPeak.
- step 25 measuring an error parameter of the equivalent MPSK signal of the composite signal, and obtaining according to the calculation The composite signal is equivalent to the error parameter of the MPSK signal and the measured error parameter of the synthesized signal equivalent MPSK signal calibrates the VSA.
- the above VSA calibration process satisfies the magnitude traceability requirement.
- an embodiment of the present invention also discloses a digital demodulation error parameter measurement system. As shown in FIG. 4, the system mainly includes:
- a continuous wave signal generator for generating a continuous wave signal C c (t) having a carrier frequency of a sum of a first frequency and a second frequency + ⁇ or a difference - ,, wherein the first frequency is greater than the second frequency /
- the VSA is configured to receive the continuous wave signal generated by the continuous wave signal generator, and measure an error parameter of the equivalent MPSK signal of the received continuous wave signal, wherein the carrier frequency of the VSA is set to the first frequency ⁇ , and the demodulation mode is set to MPSK , the symbol rate is set to the second frequency / times ⁇ , where M is a positive integer.
- Another embodiment of the present invention also discloses another digital demodulation frequency error parameter measurement system. As shown in FIG. 5, the system mainly includes:
- a continuous wave signal generator for generating a continuous wave signal having a carrier frequency of a sum or difference of a first frequency and a second frequency ⁇ and an error frequency / S , wherein the first frequency is greater than the second frequency ⁇ , and the error frequency is less than One-half of the second frequency ⁇ ;
- a power splitter for dividing the continuous wave signal generated by the continuous wave signal generator into a chopped continuous wave signal and an E continuous wave signal
- the VSA is configured to receive the chopped continuous wave signal, measure the frequency error of the equivalent MPSK signal of the received choppy continuous wave signal, and obtain a frequency error measurement, wherein the VSA carrier frequency is set to the first frequency, and the demodulation mode is set to MPSK , the symbol rate is set to M times the second frequency, where M is a positive integer;
- Frequency meter used to receive the continuous wave signal of the B road, and measure the continuous wave signal of the B road
- the frequency value is ⁇ .
- the above digital demodulation error parametric metering system should further include: an atomic clock for providing a stable clock signal for the continuous wave signal generator and the frequency meter.
- the atomic clock is a cesium atomic clock.
- Another embodiment of the present invention also discloses a digital demodulation error parameter measurement system. As shown in FIG. 6, the system mainly includes:
- a first continuous wave signal generator for generating a first continuous wave signal c cl (where the first frequency ⁇ is greater than the second frequency) with a carrier frequency of a sum of the first frequency and the second frequency + + ⁇ or a difference ⁇
- a second continuous wave signal generator for generating a second continuous wave signal c C2 having a carrier frequency of a sum of a first frequency and a third frequency ⁇ + ⁇ or a difference f d -Af d ( ⁇ , wherein the first frequency is greater than the first Three frequency ⁇ ;
- a combiner for combining the first continuous wave signal c cl (t) generated by the first continuous wave signal generator and the second continuous wave signal c C2 (t) generated by the second continuous wave signal generator to obtain a composite signal ;
- the VSA is configured to receive a composite signal outputted by the combiner, and measure an error parameter of the equivalent MPSK signal of the received composite signal, wherein the carrier frequency of the VS A is set to the first frequency, the demodulation mode is set to MPSK, and the symbol rate is set to M times the second frequency ⁇ where M is a positive integer.
- the values of the respective error parameters of the synthesized MPSK signal obtained by the above formulas (4) to (8) can be compared with the respective error parameters of the equivalent MPSK signal of the received composite signal obtained by the VSA measurement. Yes, the calibration of the VSA is achieved.
- the digital demodulation error parameter metering system may further include: a first isolator connected between the first continuous wave signal generator and the combiner
- Isolator for isolating the first continuous wave signal generator and the second continuous wave signal
- a second isolator (Isolator) connected between the second continuous wave signal generator and the combiner for isolating the second continuous The wave signal generator and the first continuous wave signal.
- the above digital demodulation error parametric metering system may further comprise: an attenuator connected between the second continuous wave signal generator and the combiner or connected between the second isolator and the combiner for adjusting the second continuous wave signal The power output to the VSA.
- Tables 1 and 2 below show the frequency of the first continuous wave signal at 999 MHz (the first frequency is 1000 MHz, the second frequency is ⁇ ), and the second continuous wave signal frequency is 999.499 MHz (the third frequency is 0.501 ⁇ ).
- the calculated values and measurement errors of the EvmRms, EvmPeak, MagErrRms, MagErrPeak, PhaseErrRms, and PhaseErrPeak error parameters of the above-mentioned composite signal equivalent MPSK signals under different ISRs, where the measurement error is VSA The ratio of the error between the measured value and the calculated value to the calculated value.
- the carrier frequency of the VSA is set to 1000MHz and the modulation mode is set to QPSK.
- the above calculated value is also the actual value of each error parameter of the equivalent MPSK signal of the composite signal.
- Figure 7 shows the calculated and measured values of the error parameter EvmRms of the equivalent MPSK signal after combining two continuous wave signals under different ISRs.
- the curve indicated by the triangle represents the measured value of EvmRms; the curve identified by the square represents the measured value of EvmRms.
- Figure 8 shows the calculated and measured values of the error parameter EvmPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals.
- the curve of the triangle mark represents the measured value of EvmPeak
- the curve of the square mark represents the measured value of EvmPeak.
- Figure 9 shows the calculated and measured values of the error parameter MagErrRms of the equivalent MPSK signal after combining two continuous wave signals under different ISRs.
- the triangle marked curve represents the measured value of MagErrRms; the square marked curve represents the measured value of MagErrRms.
- Figure 10 shows the calculated and measured values of the error parameter MagErrPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals.
- the triangle marked curve represents the measured value of MagErrPeak;
- the square marked curve represents the measured value of MagErrPeak.
- Figure 1 shows the calculated and measured values of the error parameter PhaseErrRms of the equivalent MPSK signal after the combination of the two lower continuous wave signals.
- the curve identified by the triangle represents the measured value of PhaseErrRms; the curve identified by the square represents the measured value of PhaseErrRms.
- Figure 12 shows the calculated and measured values of the error parameter PhaseErrPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals.
- the curve indicated by the triangle represents the measured value of PhaseErrPeak; the curve identified by the square represents the measured value of PhaseErrPeak.
- Figure 13 shows a typical experimental phenomenon.
- the present invention provides a digitally modulated signal having an equivalent error value using a composite signal of a two-way signal continuous wave signal, and the six error parameters of the digital modulated signal are EvmRms, EvmPeak, MagErrRms, MagErrPeak, PhaseErrRms and PhaseErrPeak can be accurately set and calculated. Since the error parameter of the composite signal can ultimately be traced to the ratio of the power of the two continuous wave signals, the signal can be accurately calibrated using this signal. Therefore, the present invention can solve both the problem of measurement traceability and error setting.
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Abstract
The present invention provides a method and system for digital demodulation error parameter measurement based on continuous wave combination approach. The method includes: generating a continuous wave signal whose carrier frequency is the sum or difference of a first frequency and a second frequency, wherein the first frequency is greater than the second frequency; and taking the generated continuous wave signal as an equivalent digital modulation signal, and inputting it to the input end of a vector signal analyzer (VSA), wherein the carrier frequency of the VSA is set as the first frequency, the demodulation mode of the VSA is set as multiple phase shift keying (MPSK), and the symbol rate of the VSA is set as M multiples of the second frequency. M is a positive integer. The error parameter generated by the method of the present invention, used for calibration of the equivalent digital modulation signal of the VSA, can be set and calculated accurately. Therefore, the present invention can simultaneously solve the problems of digital demodulation error parameter value tracing and error setting.
Description
基于连续波组合法的数字解调误差参量计量方法及*** 技术领域 Digital demodulation error parameter measurement method and system based on continuous wave combination method
本发明涉及数字解调误差参量的计量， 特别涉及基于连续波组合法 的数字解调误差参量计量方法及***。 发明背景 The invention relates to the measurement of digital demodulation error parameters, in particular to a digital demodulation error parameter measurement method and system based on continuous wave combination method. Background of the invention
目前， 数字调制信号是信息传输的主要载体， 已成为信息社会的 重要基石。 其中， 误差矢量幅度均方根值（以下简称 EvmRms ) 、 误 差矢量幅度峰值 （以下简称 EvmPeak ) 、 幅度误差均方根值（以下简 称 MagErrRms)、 幅度误差峰值（以下简称 MagErrPeak ) 、 相位误差 均方根值（以下简称 PhaseErrRms)、 相位误差峰值（以下简称 PhaseErrPeak)以及频率误差 （以下简称 FrequencyErr )是衡量数字调 制信号误差的重要误差参量。 和所有的物理量一样， 这些误差参量也 必须经过可信的、 可溯源的计量， 才能保证量值准确和统一， 才能保 证信息***的正常运转。 然而， 在目前的数字调制误差参量计量中仍 存在如下问题： At present, digital modulation signals are the main carrier of information transmission and have become an important cornerstone of the information society. Wherein, the error vector magnitude rms value (hereinafter referred to as EvmRms), the error vector amplitude peak (hereinafter referred to as EvmPeak), the amplitude error rms value (hereinafter referred to as MagErrRms), the amplitude error peak (hereinafter referred to as MagErrPeak), the phase error mean square The root value (hereinafter referred to as PhaseErrRms), the phase error peak (hereinafter referred to as PhaseErrPeak), and the frequency error (hereinafter referred to as FrequencyErr) are important error parameters for measuring the error of the digital modulation signal. As with all physical quantities, these error parameters must be calibrated and traceable to ensure accurate and uniform values to ensure proper operation of the information system. However, the following problems still exist in the current digital modulation error parameter measurement:
1、 闭环互测， 难于溯源。 这主要是指： 根据目前国内外的数字 调制误差参量计量方法 （例如 JJF 1128-2004矢量信号分析仪校准规 范或 JJF 1 174-2007 数字信号发生器校准规范规定的数字调制误差 参量计量方法）， 一方面， 数字信号发生器是用矢量信号分析仪（以 下简称 VSA ) 来校准的， 即数字信号发生器所生成数字调制信号的 各个误差参量并不是已知的， 而是由 VSA测量并分析得出的； 另一 方面， 对 VSA的校准则基于数字信号发生器作为标准器。 上述计量 过程明显是一个闭环互测的过程，而且是一个不可溯源的闭环互测的
过程， 是计量体系中"空中楼阁"。 也就是说， 目前的数字调制误差参 量计量得到的误差参量是不可溯源的，这难于保证计量过程的准确度 和可信度。 1, closed-loop mutual testing, difficult to trace. This mainly refers to: According to the current domestic and international digital modulation error parameter measurement methods (such as JJF 1128-2004 vector signal analyzer calibration specification or JJF 1 174-2007 digital signal generator calibration specification specified digital modulation error parameter measurement method), On the one hand, the digital signal generator is calibrated by a vector signal analyzer (hereinafter referred to as VSA), that is, the respective error parameters of the digital modulated signal generated by the digital signal generator are not known, but are measured and analyzed by the VSA. On the other hand, the calibration of the VSA is based on a digital signal generator as a standard. The above measurement process is obviously a closed-loop mutual measurement process, and it is a non-traceable closed-loop mutual test. The process is the "castle in the air" in the measurement system. That is to say, the error parameters obtained by the current digital modulation error parameter measurement are not traceable, which is difficult to ensure the accuracy and credibility of the measurement process.
2、 用于校准 VSA的数字调制信号缺乏误差参量的设置。 在实际 应用***中，由于多种因素的干扰，数字调制信号往往是存在误差的， 且误差不会是固定的值。 因此， 为了保证 VSA能够准确计量数字调 制信号的各个误差参量， 作为校准 VSA标准器的数字调制信号的误 差参量在一定范围内应当是可以设置的。 然而， 当前校准方法却是不 对误差参量进行设置的，这是脱离数字调制误差参量的实际应用要求 的。 发明内容 2. The digital modulation signal used to calibrate the VSA lacks the setting of the error parameters. In practical applications, digitally modulated signals are often subject to errors due to interference from multiple factors, and the error is not a fixed value. Therefore, in order to ensure that the VSA can accurately measure the individual error parameters of the digital modulation signal, the error parameters of the digital modulation signal used as the calibration VSA standard should be configurable within a certain range. However, the current calibration method does not set the error parameters, which is required for practical applications away from the digital modulation error parameters. Summary of the invention
为了解决上述问题，本发明的实施例提供了数字解调误差参量计 量方法及***，可以生成误差参量可溯源的等效数字调制信号作为校 准 VSA的标准信号， 以彻底解决数字解调误差参量计量过程的准确 度和可信度问题。 In order to solve the above problems, embodiments of the present invention provide a digital demodulation error parameter measurement method and system, which can generate an equivalent digital modulation signal traceable by an error parameter as a standard signal for calibrating a VSA, to completely solve the digital demodulation error parameter measurement. The accuracy and credibility of the process.
本发明实施例提供的数字解调误差参量计量方法， 包括： 生成载波频率为第一频率与第二频率之和或差的连续波信号，其 中第一频率大于第二频率； The digital demodulation error parameter measurement method provided by the embodiment of the present invention includes: generating a continuous wave signal whose carrier frequency is the sum or difference of the first frequency and the second frequency, wherein the first frequency is greater than the second frequency;
将所生成的连续波信号作为等效数字调制信号输入到 VSA的输 入端， 其中， VSA 的载波频率设置为第一频率， 解调模式设置为 M 进制相移键控 MPSK, 符号速率设置为第二频率的 M倍， 其中， M 为正整数。 The generated continuous wave signal is input to the input end of the VSA as an equivalent digital modulation signal, wherein the carrier frequency of the VSA is set to the first frequency, the demodulation mode is set to the M-ary phase shift keying MPSK, and the symbol rate is set to M times the second frequency, where M is a positive integer.
本发明实施例提供的一种数字解调频率误差参量计量方法， 包 括：
生成载波频率为第一频率与第二频率的和或差与误差频率之和 的连续波信号， 其中第一频率大于第二频率， 误差频率小于第二频率 的二分之一； A digital demodulation frequency error parameter measurement method provided by an embodiment of the present invention includes: Generating a continuous wave signal having a carrier frequency of a sum of a first frequency and a second frequency and a difference between the error frequency and the error frequency, wherein the first frequency is greater than the second frequency, and the error frequency is less than one-half of the second frequency;
将所生成的连续波信号通过功分器分为曱路连续波信号和乙路 连续波信号； The generated continuous wave signal is divided into a continuous wave signal and a continuous wave signal by a power splitter;
将曱路连续波信号作为等效数字调制信号输入到矢量信号分析 仪 VSA的输入端， 获得曱路连续波信号等效 MPSK信号的频率误差 的测量值， 其中， VSA 的载波频率设置为第一频率， 解调模式设置 为 MPSK, 符号速率设置为第二频率的 Λ 倍， 其中， Λ 为正整数； 将乙路连续波信号输入到频率计， 得到频率计测量得到的频率 值， 并根据频率计测量得到的频率值计算频率误差的实际值； 以及根 据频率误差的实际值对以及 VSA 测量得到的频率误差的测量值对 VSA进行校准。 The chopped continuous wave signal is input as an equivalent digital modulation signal to the input end of the vector signal analyzer VSA, and the measured value of the frequency error of the equivalent MPSK signal of the chopper continuous wave signal is obtained, wherein the carrier frequency of the VSA is set to be the first Frequency, the demodulation mode is set to MPSK, the symbol rate is set to Λ times the second frequency, where Λ is a positive integer; the B continuous wave signal is input to the frequency meter to obtain the frequency value measured by the frequency meter, and according to the frequency The measured frequency value is used to calculate the actual value of the frequency error; and the VSA is calibrated based on the actual value pair of the frequency error and the measured value of the frequency error obtained by the VSA measurement.
上述频率误差的实际值为频率计测量得到的频率值减去第一频 率与第二频率的和或差后得到的差值。 The actual value of the above frequency error is the difference between the frequency value measured by the frequency meter minus the sum or difference of the first frequency and the second frequency.
本发明实施例提供的另一种基于连续波组合法的数字解调误差 参量计量方法， 包括： Another method for digital demodulation error parameter measurement based on continuous wave combination method provided by an embodiment of the present invention includes:
生成载波频率为第一频率与第二频率之和或差的第一连续波信 号， 其中第一频率大于第二频率； Generating a first continuous wave signal whose carrier frequency is a sum or a difference between the first frequency and the second frequency, wherein the first frequency is greater than the second frequency;
生成载波频率为第一频率与第三频率之和或差的第二连续波信 号， 其中第一频率大于第三频率； Generating a second continuous wave signal whose carrier frequency is the sum or difference between the first frequency and the third frequency, wherein the first frequency is greater than the third frequency;
将第一连续波信号和第二连续波信号合并为一路合成信号作为 等效数字调制信号输入到 VSA的输入端， 其中， VSA的载波频率设 置为第一频率， 解调模式设置为 MPSK, 符号速率设置为第二频率的 M倍， 其中， M为正整数。
上述的合并为将第一连续波信号和第二连续波信号相加。 Combining the first continuous wave signal and the second continuous wave signal into one combined signal as an equivalent digital modulation signal input to the input end of the VSA, wherein the carrier frequency of the VSA is set to the first frequency, and the demodulation mode is set to MPSK, the symbol The rate is set to M times the second frequency, where M is a positive integer. The above combination is to add the first continuous wave signal and the second continuous wave signal.
上述方法进一步包括：在将第一连续波信号和第二连续波信号合 并为一路合成信号后， 计算所述合成信号等效 MPSK信号的误差参 量； VSA 在接收到所述合成信号后， 测量得到所述合成信号等效 MPSK信号的误差参量， 并根据计算得到的所述合成信号等效 MPSK 信号的误差参量以及测量得到的误差参量对 VSA进行校准。 The method further includes: after combining the first continuous wave signal and the second continuous wave signal into one combined signal, calculating an error parameter of the equivalent MPSK signal of the synthesized signal; after receiving the synthesized signal, the VSA is measured The composite signal is equivalent to an error parameter of the MPSK signal, and the VSA is calibrated according to the calculated error parameter of the equivalent MPSK signal of the composite signal and the measured error parameter.
上述误差参量包括： 误差矢量幅度均方根值 EvmRms; 所述计算 所述合成信号等效 MPSK信号的误差参量包括： 根据如下公式计算 所述合成信号等效 MPSK信号的 EvmRms: EvmRms 2 - 2. The error parameter includes: an error vector magnitude rms value EvmRms; the calculating an error parameter of the composite signal equivalent MPSK signal comprises: calculating EvmRms of the composite signal equivalent MPSK signal according to the following formula: EvmRms 2 - 2.
l + ISR 上述误差参量包括： 幅度误差均方根值 MagErrRms; 所述计 所述合成信号等效 MPSK信号的误差参量包括： 根据如下公式计 所述合成信号等效 MPSK信号的 Ma ErrRms: l + ISR The above error parameters include: amplitude error rms value MagErrRms; the error parameter of the synthesized signal equivalent MPSK signal includes: Ma ErrRms of the synthesized signal equivalent MPSK signal according to the following formula:
MagErrRmsMagErrRms
上述误差参量包括： 幅度误差峰值 MagErrPeak; 所述计算所述 合成信号等效 MPSK信号的误差参量包括： 根据如下公式计算所述 合成信号等效 MPSK信号的 MagErrPeak: MagErrPeak ο
The error variable comprises: a peak amplitude error MagErrPeak; calculating the composite signal equivalent to the MPSK signal error parameters comprises: calculating the composite signal equivalent MagErrPeak MPSK signal according to the formula: MagErrPeak ο
上述误差参量包括： 误差矢量幅度峰值 EvmPeak; 所述计算所述 合成信号等效 MPSK信号的误差参量包括： 根据如下公式计算所述 合成信号等效 MPSK信号的 EvmPeak: EvmPeak=l - 。 The error parameter includes: an error vector amplitude peak value EvmPeak; the calculating the error parameter of the synthesized signal equivalent MPSK signal comprises: calculating EvmPeak of the composite signal equivalent MPSK signal according to the following formula: EvmPeak=l - .
上述误差参量包括： 相位误差均方根值 PhaseErrRms; 所述计算 所述合成信号等效 MPSK信号的误差参量包括： 根据如下公式计算
所 述 合 成 信 号 等 效 MPSK 信 号 的 PhaseErrRms ：
The error parameter includes: a phase error root mean square value PhaseErrRms; the calculating an error parameter of the composite signal equivalent MPSK signal includes: calculating according to the following formula The synthesized signal is equivalent to the PhaseErrRms of the MPSK signal:
上述误差参量包括： 相位误差峰值 PhaseErrPeak; 所述计算所述 合成信号等效 MPSK信号的误差参量包括： 根据如下公式计算所述 合 成 信 号 等 效 MPSK 信 号 的 PhaseErrPeak ： PhaseErrPeak= arcsin V75;R , 其中， ISR 为第二连续波信号功率与第 一连续波信号功率的比值。 The error parameter includes: a phase error peak value PhaseErrPeak; the calculating an error parameter of the composite signal equivalent MPSK signal includes: calculating a PhaseErrPeak of the composite signal equivalent MPSK signal according to the following formula: PhaseErrPeak= arcsin V75 ; R , wherein The ISR is the ratio of the power of the second continuous wave signal to the power of the first continuous wave signal.
上述公式中， ISR为输入 VSA的第二连续波信号功率与第一连 续波信号功率的比值。 In the above formula, the ISR is the ratio of the power of the second continuous wave signal input to the VSA to the power of the first continuous wave signal.
特别地， 上述 小于 -8dB; 且若在 VSA中一次解调分析用于 统计结果的符号数为 Nx M , Wy¾为整数， 其中， A为第三频率与第 二频率的比值。 Specifically, the above is less than -8 dB; and if the number of symbols used for statistical analysis in the VSA is Nx M , Wy3⁄4 is an integer, where A is the ratio of the third frequency to the second frequency.
本发明的实施例提供了一种数字解调误差参量计量***， 包括： 连续波信号发生器，用于生成载波频率为第一频率与第二频率之 和或差的连续波信号， 其中第一频率大于第二频率； Embodiments of the present invention provide a digital demodulation error parameter measurement system, including: a continuous wave signal generator for generating a continuous wave signal having a carrier frequency of a sum or a difference between a first frequency and a second frequency, wherein the first The frequency is greater than the second frequency;
矢量信号分析仪 VSA, 用于接收连续波信号发生器所生成的连 续波信号， 测量所接收连续波信号等效 MPSK信号的误差参量， 在 连续波失真很小的情况下， 可以认为这种等效 MPSK信号的数字调 制误差参量为零。 其中， VSA 的载波频率设置为第一频率， 解调模 式设置为 MPSK, 符号速率设置为第二频率的 Λ 倍， 其中， Λ 为正 整数。 The vector signal analyzer VSA is used for receiving the continuous wave signal generated by the continuous wave signal generator, and measuring the error parameter of the equivalent MPSK signal of the received continuous wave signal. When the continuous wave distortion is small, it can be considered as such. The digital modulation error parameter of the MPSK signal is zero. The carrier frequency of the VSA is set to the first frequency, the demodulation mode is set to MPSK, and the symbol rate is set to Λ times the second frequency, where Λ is a positive integer.
本发明的实施例提供了一种数字解调频率误差参量计量***，包 括：
连续波信号发生器，用于生成载波频率为第一频率与第二频率的 和或差与误差频率之和的连续波信号， 其中第一频率大于第二频率； 较佳地， 误差频率小于第二频率的二分之一。 Embodiments of the present invention provide a digital demodulation frequency error parameter measurement system, including: a continuous wave signal generator, configured to generate a continuous wave signal having a carrier frequency of a sum of a first frequency and a second frequency and a sum of a difference and an error frequency, wherein the first frequency is greater than the second frequency; preferably, the error frequency is less than One-half of the two frequencies.
功分器，用于将连续波信号发生器生成的连续波信号分为曱路连 续波信号和乙路连续波信号； a power splitter for dividing the continuous wave signal generated by the continuous wave signal generator into a chopped continuous wave signal and an E continuous wave signal;
矢量信号分析仪 VSA, 用于接收曱路连续波信号， 测量所接收 曱路连续波信号等效 进制相移键控 MPSK信号的频率误差， 得到 频率误差的测量值， 其中， VSA 的载波频率设置为第一频率， 解调 模式设置为 MPSK, 符号速率设置为第二频率的 M倍， 其中， M 正整数； The vector signal analyzer VSA is configured to receive the chopped continuous wave signal, measure the frequency error of the equivalent cue phase shift keying MPSK signal of the received chopped continuous wave signal, and obtain a measured value of the frequency error, wherein the carrier frequency of the VSA Set to the first frequency, the demodulation mode is set to MPSK, and the symbol rate is set to M times of the second frequency, where M is a positive integer;
频率计， 用于接收乙路连续波信号， 测量得到的乙路连续波信号 的频率值。 The frequency meter is used to receive the continuous wave signal of the B road and measure the frequency value of the continuous wave signal of the B road.
上述***进一步包括： 原子钟， 用于为所述连续波信号发生器和 频率计提供稳定的时钟信号， 其中， 所述原子钟为铷原子钟。 The above system further includes: an atomic clock for providing a stable clock signal to the continuous wave signal generator and the frequency meter, wherein the atomic clock is a helium atomic clock.
本发明的实施例提供了另一种基于连续波组合法的数字解调误 差参量计量***， 包括： Embodiments of the present invention provide another digital demodulation error parameter measurement system based on continuous wave combination method, including:
第一连续波信号发生器，用于生成载波频率为第一频率与第二频 率之和或差的第一连续波信号， 其中第一频率大于第二频率； a first continuous wave signal generator, configured to generate a first continuous wave signal whose carrier frequency is a sum or a difference between the first frequency and the second frequency, wherein the first frequency is greater than the second frequency;
第二连续波信号发生器，用于生成载波频率为第一频率与第三频 率之和或差的第二连续波信号， 其中第一频率大于第三频率； 推荐值 是第二频率大于第三频率。 a second continuous wave signal generator, configured to generate a second continuous wave signal whose carrier frequency is a sum or a difference between the first frequency and the third frequency, wherein the first frequency is greater than the third frequency; and the recommended value is that the second frequency is greater than the third frequency frequency.
合路器，用于合成第一连续波信号发生器生成的第一连续波信号 和第二连续波信号发生器生成的第二连续波信号得到合成信号； a combiner for synthesizing the first continuous wave signal generated by the first continuous wave signal generator and the second continuous wave signal generated by the second continuous wave signal generator to obtain a composite signal;
矢量信号分析仪 VSA, 用于接收合路器输出的合成信号， 测量 所接收合成信号等效 MPSK信号的误差参量， 其中， VSA的载波频
率设置为第一频率， 解调模式设置为 MPSK, 符号速率设置为第二频 率的 M倍， 其中， M为正整数。 a vector signal analyzer VSA for receiving a composite signal output from the combiner, measuring an error parameter of the equivalent MPSK signal of the received composite signal, wherein the carrier frequency of the VSA The rate is set to the first frequency, the demodulation mode is set to MPSK, and the symbol rate is set to M times the second frequency, where M is a positive integer.
上述数字解调误差参量计量***进一步包括： 第一隔离器， 连接 在第一连续波信号发生器和合路器之间，用于隔离第一连续波信号发 生器和第二连续波信号； 第二隔离器， 连接在第二连续波信号发生器 和合路器之间， 用于隔离第一连续波信号发生器和第二连续波信号。 The digital demodulation error parameter metering system further includes: a first isolator connected between the first continuous wave signal generator and the combiner for isolating the first continuous wave signal generator and the second continuous wave signal; The isolator is connected between the second continuous wave signal generator and the combiner for isolating the first continuous wave signal generator and the second continuous wave signal.
上述数字解调误差参量计量***进一步包括： 衰减器， 连接在第 二连续波信号发生器和合路器之间或连接在第二隔离器和合路器之 间， 用于调整第二连续波信号输出到 VSA的功率。 The digital demodulation error parameter metering system further includes: an attenuator connected between the second continuous wave signal generator and the combiner or connected between the second isolator and the combiner for adjusting the output of the second continuous wave signal to The power of the VSA.
有鉴于此， 本发明提供了等效的存在误差的数字调制信号， 且该 数字调制信号的 6 个误差参量 EvmRms、 EvmPeak, MagErrRms , In view of this, the present invention provides an equivalent digital modulated signal with error, and the six error parameters of the digital modulated signal are EvmRms, EvmPeak, MagErrRms,
MagErrPeak、 PhaseErrRms以及 PhaseErrPeak是可以精确设定、 计算 的。由于该数字调制信号的误差参量最终可以溯源两路连续波信号的 功率比值， 从而能够使用这种信号对矢量解调误差参量进行准确校 准。 因此， 本发明可以同时解决计量溯源和误差设置两个问题。 附图简要说明 MagErrPeak, PhaseErrRms, and PhaseErrPeak can be accurately set and calculated. Since the error parameter of the digitally modulated signal can ultimately trace the power ratio of the two continuous wave signals, the vector can be accurately calibrated using the signal. Therefore, the present invention can solve both the problem of metering traceability and error setting. BRIEF DESCRIPTION OF THE DRAWINGS
下面将通过参照附图详细描述本发明的示例性实施例 ,使本领域 的普通技术人员更清楚本发明的上述及其它特征和优点， 附图中： 图 1 为本发明实施例提供的一种数字解调误差参量计量方法的 流程图； The above and other features and advantages of the present invention will become more apparent to those skilled in the <RTI Flow chart of digital demodulation error parameter measurement method;
图 2 为本发明另一个实施例提供的数字解调误差参量计量方法 的流程图； 2 is a flowchart of a digital demodulation error parameter measurement method according to another embodiment of the present invention;
图 3 为本发明又一个实施例提供的数字解调误差参量计量方法 的流程图；
图 4为本发明实施例提供的数字解调误差计量***结构示意图； 图 5 为本发明另一个实施例提供的数字解调误差计量***结构 示意图； FIG. 3 is a flowchart of a method for measuring a digital demodulation error parameter according to still another embodiment of the present invention; FIG. 4 is a schematic structural diagram of a digital demodulation error measurement system according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of a digital demodulation error measurement system according to another embodiment of the present invention;
图 6 为本发明又一个实施例提供的数字解调误差计量***结构 示意图； 6 is a schematic structural diagram of a digital demodulation error measurement system according to still another embodiment of the present invention;
图 7显示了不同 ISR下两路连续波信号合并后等效 MPSK信号 的误差参量 EvmRms的计算值和测量值； Figure 7 shows the calculated and measured values of the error parameter EvmRms of the equivalent MPSK signal after combining two continuous wave signals under different ISRs;
图 8显示了不同 下两路连续波信号合并后等效 MPSK信号 的误差参量 EvmPeak的计算值和测量值； Figure 8 shows the calculated and measured values of the error parameter EvmPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals;
图 9显示了不同 ISR下两路连续波信号合并后等效 MPSK信号 的误差参量 MagErrRms的计算值和测量值； Figure 9 shows the calculated and measured values of the error parameter MagErrRms of the equivalent MPSK signal after combining two continuous wave signals under different ISRs;
图 10显示了不同 下两路连续波信号合并后等效 MPSK信号 的误差参量 MagErrPeak的计算值和测量值； Figure 10 shows the calculated and measured values of the error parameter MagErrPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals;
图 1 1显示了不同 下两路连续波信号合并后等效 MPSK信号 的误差参量 PhaseErrRms的计算值和测量值； Figure 1 shows the calculated and measured values of the error parameter PhaseErrRms of the equivalent MPSK signal after the combination of the two lower continuous wave signals.
图 12显示了不同 下两路连续波信号合并后等效 MPSK信号 的误差参量 PhaseErrPeak的计算值和测量值； Figure 12 shows the calculated and measured values of the error parameter PhaseErrPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals.
图 13显示了 ISR=-10dB时， 不同 A情况下 VSA输出的 4PSK ( QPSK ) 解调矢量图。 实施本发明的方式 Figure 13 shows the 4PSK (QPSK) demodulation vector of the VSA output for different A cases with ISR = -10dB. Mode for carrying out the invention
为了解决现有数字信号发生器所生成的数字调制信号的误差参 量不可溯源的问题，本发明的实施例提供了一种数字解调误差参量计 量校准方法， 如图 1所示， 该方法主要包括： In order to solve the problem that the error parameter of the digital modulated signal generated by the existing digital signal generator is not traceable, the embodiment of the present invention provides a digital demodulation error parameter measurement and calibration method. As shown in FIG. 1 , the method mainly includes :
步骤 1 11：生成载波频率为第一频率 与第二频率 /έ之和 + /έ或
差^ -Λ的连续波信号 cc (t) , 其中第一频率^大于第二频率 Λ ; 需要 说明的是， 在本步骤中第一频率 和第二频率 Λ均为正值。 Step 1 11: Generate a carrier frequency of the sum of the first frequency and the second frequency / + + / έ or The continuous wave signal c c (t) of the difference ^ - , , wherein the first frequency ^ is greater than the second frequency Λ; it should be noted that the first frequency and the second frequency Λ are both positive values in this step.
通过上述步骤 1 1生成的连续波信号可以通过如下公式（ 1 )表达： The continuous wave signal generated by the above step 1 1 can be expressed by the following formula (1):
Cc (t) = C0S[2 ( 士 ( 1 ) C c (t) = C0S [2 (士( 1 )
其中， 为任意相位值。 Where is the arbitrary phase value.
步骤 1 12: 将所生成的连续波信号作为等效数字调制信号输入到 Step 1 12: Input the generated continuous wave signal as an equivalent digital modulation signal to
VSA的输入端， 其中， VSA的载波频率设置为第一频率 Λ , 解调模 式设置为 Μ进制相移键控（MPSK ) ， 符号速率设置为第二频率 Λ的 Μ倍 Mfb , 其中， M为正整数。 The input end of the VSA, wherein the carrier frequency of the VSA is set to the first frequency Λ, the demodulation mode is set to the binary phase shift keying (MPSK), and the symbol rate is set to the second frequency Λ times Mf b , where M is a positive integer.
另外， 为了实现数字调制信号频率误差的测量， 本发明的实施例 还给出了一种数字解调频率误差参量计量方法，可以实现数字调制信 号频率误差 FrequencyErr的测量， 如图 2所示， 该方法主要包括： 步骤 121 : 生成载波频率为第一频率 与第二频率 Λ的和或差与 误差频率/^之和的连续波信号， 其中第一频率 Λ大于第二频率 Λ ,且 In addition, in order to achieve the measurement of the frequency error of the digital modulation signal, the embodiment of the present invention also provides a digital demodulation frequency error parameter measurement method, which can measure the frequency error FrequencyErr of the digital modulation signal, as shown in FIG. 2, The method mainly includes: Step 121: generating a continuous wave signal with a carrier frequency of a sum of a first frequency and a second frequency Λ and a sum of an error frequency/^, wherein the first frequency Λ is greater than the second frequency Λ, and
^小于/的二分之一。 ^ Less than / half of /.
需要说明的是，在本步骤中，第一频率 和第二频率 Λ均为正值。 步骤 122: 将所生成的连续波信号通过功分器分为曱路连续波信 号和乙路连续波信号。 It should be noted that in this step, the first frequency and the second frequency Λ are both positive values. Step 122: The generated continuous wave signal is divided into a continuous wave signal and a continuous wave signal of the B through the power splitter.
步骤 123 : 将曱路连续波信号输入到矢量信号分析仪 VSA的输 入端 ,获得曱路连续波信号等效 MPSK信号的频率误差的测量值 fED , 其中， VSA的载波频率设置为第一频率， 解调模式设置为 MPSK, 符 号速率设置为第二频率的 Λ 倍， 其中， Λ 为正整数。 Step 123: Input the chopped continuous wave signal to the input end of the vector signal analyzer VSA to obtain a measured value f ED of the frequency error of the equivalent MPSK signal of the compulsory continuous wave signal, wherein the carrier frequency of the VSA is set to the first frequency The demodulation mode is set to MPSK, and the symbol rate is set to Λ times the second frequency, where Λ is a positive integer.
步骤 124: 将乙路连续波信号输入到频率计， 得到频率计测量得 到的频率值/: , 并根据频率计测量得到的频率值计算频率误差的实际 值 。
在本步骤中， 频率误差的实际值 fER可以通过公式 fER = fc -(fd士 Λ) 计算得到。 Step 124: Input the continuous wave signal of the B path to the frequency meter to obtain the frequency value /: measured by the frequency meter, and calculate the actual value of the frequency error according to the frequency value measured by the frequency meter. In this step, the actual value f ER of the frequency error can be calculated by the formula f ER = f c -(f d士Λ).
步骤 125: 根据频率误差的实际值对以及 VSA测量得到的频率 误差的测量值对 VSA进行校准。 Step 125: Calibrate the VSA based on the actual value pair of the frequency error and the measured value of the frequency error measured by the VSA.
从上述方法可以看出， 曱路连续波信号等效 MPSK信号的频率 误差与误差频率 /£S有关， 可以通过误差频率 /£S进行设置。 It can be seen from the above method that the frequency error of the equivalent MPSK signal of the chopped continuous wave signal is related to the error frequency / £S , which can be set by the error frequency / £S .
上述步骤 111和 121生成的连续波信号在 VSA经过解调以后等 效为 MPSK信号， 且能够遍历 MPSK信号上的所有符号点。 以步骤 111生成的连续波信号为例证明如下： The continuous wave signals generated in the above steps 111 and 121 are equivalent to the MPSK signal after being demodulated by the VSA, and are capable of traversing all the symbol points on the MPSK signal. The continuous wave signal generated in step 111 is exemplified as follows:
在使用频率为第一频率 Λ的连续波对 Cc {ή进行正交解调 ,并进行 低通滤波后可以得到表达式为 (0 = exp [j{2 fbt + )]的矢量信号。本领 域的技术人员可以理解， 在 IQ正交坐标系上代表一个以角速度 旋转的矢量圓， 如果以 的速率对该矢量圓进行抽样， 则形成 的星座点就是矢量圓内割正 Μ边形的 Μ个顶点。如果 VSA内置 MPSK 解调模式， 则通过载波相位同步和码元同步， 可以将这 M个抽样星 座点同步到设计星座点。 由此可以看出， 频率为 ±Λ的单载波信号 可以等效为载波频率为 ， 符号速率^ 波特（Baud )的 MPSK信号， 且其符号序列沿 MPSK设计星座点依次取值， 而不是随机取值。 由 于上述等效 MPSK信号本质上是连续波信号， 且如果连续波信号是 低失真的， 则这种等效 MPSK信号的调制误差可以认为接近零。 因 此， 使用这种等效的 MPSK信号可以对 VSA实现可溯源校准， 通常 使用二进制相移键控 （2PSK ) 、 四进制相移键控 （4PSK ) 和八进制 相移键控（8PSK )等模式。 然而， 除频率误差之外， 上述等效 MPSK 信号的误差参量是固定的， 不能进行设置。 The vector signal with the expression (0 = exp [j{2 f b t + )] can be obtained by orthogonally demodulating C c {ή with a continuous wave of the first frequency Λ and performing low-pass filtering. . It will be understood by those skilled in the art that on the IQ orthogonal coordinate system, a vector circle rotating at an angular velocity is represented. If the vector circle is sampled at a rate, the constellation point formed is a vector circle with a regular square shape. A vertice. If the VSA has an MPSK demodulation mode built in, the M sample constellation points can be synchronized to the design constellation point by carrier phase synchronization and symbol synchronization. It can be seen that the single carrier signal with a frequency of ±Λ can be equivalent to the MPSK signal with the carrier frequency of the symbol rate ^Baud (Baud), and the symbol sequence is sequentially taken along the MPSK design constellation point instead of random. Value. Since the above equivalent MPSK signal is essentially a continuous wave signal, and if the continuous wave signal is low distortion, the modulation error of this equivalent MPSK signal can be considered to be close to zero. Therefore, traceable calibration can be implemented for the VSA using this equivalent MPSK signal, typically using binary phase shift keying (2PSK), quaternary phase shift keying (4PSK), and octal phase shift keying (8PSK). . However, in addition to the frequency error, the error parameter of the above equivalent MPSK signal is fixed and cannot be set.
更进一步， 为了实现等效 MPSK信号其他误差参量的设置， 本
发明的实施例还提供了一种数字解调误差参量计量方法，该方法又称 为基于连续波组合法的数字解调误差参量计量方法， 如图 3所示， 该 方法主要包括： Further, in order to realize the setting of other error parameters of the equivalent MPSK signal, The embodiment of the invention also provides a digital demodulation error parameter measurement method, which is also called a digital demodulation error parameter measurement method based on the continuous wave combination method. As shown in FIG. 3, the method mainly includes:
步骤 21： 生成载波频率为第一频率 与第二频率 Λ之和 + /έ或 差 -Λ的第一连续波信号 cclW, 其中第一频率 大于第二频率 /έ。 Step 21: Generate a first continuous wave signal c cl W whose carrier frequency is the sum of the first frequency and the second frequency + + / έ or difference - ,, wherein the first frequency is greater than the second frequency / έ .
已知通过上述步骤 21 生成的第一连续波信号 Ccl(t)可以通过上 述公式 （ 1 )表达。 It is known that the first continuous wave signal C cl (t) generated by the above step 21 can be expressed by the above formula (1).
步骤 22: 生成载波频率为第一频率 与第三频率 ΔΛ之和 +ΔΛ 或差 -ΔΛ的第二连续波信号 CC2(t) , 其中第一频率 大于第三频率 Step 22: Generate a second continuous wave signal C C2 (t) whose carrier frequency is the sum of the first frequency and the third frequency ΔΛ+ΔΛ or the difference -ΔΛ, wherein the first frequency is greater than the third frequency
△Λ。 △Λ.
通过上述步骤 22 生成的第二连续波信号 CC2(t)可以通过如下公 式 （3 )表达：The second continuous wave signal C C2 (t) generated by the above step 22 can be expressed by the following formula (3):
2( = ( 2 (Λ ±ΔΛ)"%] ( 3 ) 步骤 23：将第一连续波信号 CC1 (t)和第二连续波信号 CC2 (t)合并为 一路合成信号作为等效数字调制信号输入到 VSA的输入端， 其中， VSA的载波频率设置为第一频率^,解调模式设置为 MPSK,符号速 率设置为第二频率/的 M倍^ , 其中， M为正整数。 2( = ( 2 (Λ ±ΔΛ)"%] ( 3 ) Step 23: Combine the first continuous wave signal C C1 (t) and the second continuous wave signal C C2 (t) into one combined signal as an equivalent number The modulation signal is input to the input end of the VSA, wherein the carrier frequency of the VSA is set to the first frequency ^, the demodulation mode is set to MPSK, and the symbol rate is set to M times of the second frequency /, where M is a positive integer.
需要说明的是， 本步骤所述的合并是指将第一连续波信号 Ccl(t) 和第二连续波信号 CC2(t)相加， 在实际应用中可以使用合路器 ( Combiner ) 将两路连续波信号进行合并。 It should be noted that the merging described in this step refers to adding the first continuous wave signal C cl (t) and the second continuous wave signal C C2 (t). In practical applications, a combiner can be used. Combine two continuous wave signals.
假设上述第一连续波信号 CC1 (t)和第二连续波信号 CC2 (t)的干扰 频偏比 , 优选地， A为小于 1 的正数， 则通过合并上述第
Assuming an interference frequency offset ratio of the first continuous wave signal C C1 (t) and the second continuous wave signal C C2 (t), preferably, A is a positive number less than 1,
一连续波信号 ccl (t)和第二连续波信号 CC2 (ή得到的合成信号经过正
交解调后的矢量表达式如下面公式（4)所示， 其中， ¾?为第二连续 波信号功率与第一连续波信号功率的比值。 a continuous wave signal c cl (t) and a second continuous wave signal C C2 (the synthesized signal obtained by ή is positive The demodulated vector expression is as shown in the following formula (4), where 3⁄4? is the ratio of the power of the second continuous wave signal to the power of the first continuous wave signal.
V{t) = exp(72^t + φχ ) + lSR^V(j2 M bt + φ2) (4) 若在 VSA中一次解调分析用于统计结果的符号数为 NxM, 则在 本实施例中， 要求 VSA的抽样时间是上述公式（4)两个分量周期的 整数倍， 即 VSA 的抽样时间是 (j2Kfbt + (Pl、的周期以及
+ )的周期的整数倍， 即^ ¾为整数， 且其值越大越好， 上述合成信号可以等效为一个存在误差的 MPSK 信号， 且该等效 MPSK 信号的 EvmRms、 EvmPeak、 MagErrRms、 MagErrPeak、 PhaseErrRms、 PhaseErrPeak , 是可以精确设定并计算的。 V{t) = exp(72^t + φ χ ) + lSR^ V (j2 M b t + φ 2 ) (4) If the number of symbols used for statistical analysis in the VSA is NxM, then In this embodiment, the sampling time of the VSA is required to be an integral multiple of two component periods of the above formula (4), that is, the sampling time of the VSA is (j2Kf b t + (Pl , the period and An integer multiple of the period of +), that is, ^3⁄4 is an integer, and the larger the value, the better. The above composite signal can be equivalent to an MPSK signal with error, and EvmRms, EvmPeak, MagErrRms, MagErrPeak of the equivalent MPSK signal, PhaseErrRms, PhaseErrPeak, can be accurately set and calculated.
由于第二连续波信号功率与第一连续波信号功率的比值太大将 会影响 VSA测量的准确度， 因此， 应当保证 小于一定的门限值， 较佳地， 应当保证 /57?<-8(1Β。 同时， VSA 的解调带宽 span推荐设置 为 3Λ。 Since the ratio of the power of the second continuous wave signal to the power of the first continuous wave signal is too large, the accuracy of the VSA measurement is affected, and therefore, it should be guaranteed to be less than a certain threshold, and preferably, it should be guaranteed /57?<-8 ( 1Β At the same time, the VSA's demodulation bandwidth span is recommended to be set to 3Λ.
在上述情况下， 上述合成信号等效 MPSK信号的 EvmRms可以 In the above case, the EvmRms of the above-mentioned composite signal equivalent MPSK signal can
上述合成信号等效 MPSK信号的 EvmPeak和 MagErrPeak可以通
EvmPeak and MagErrPeak of the above synthetic signal equivalent MPSK signal can pass
JISR + 1 JISR + 1
上述合成信号等效 MPSK信号的 MagErrRms可以通过如下公式
MagErrRms 2 (1 + ISR ) -
The above-mentioned synthetic signal equivalent MPSK signal MagErrRms can pass the following formula MagErrRms 2 (1 + ISR ) -
上述合成信号等效 MPSK信号的 PhaseErrRms可以通过如下公 The PhaseErrRms of the above synthetic signal equivalent MPSK signal can be as follows
arcsm - l + yflSR cos d ( 8 ) Arcsm - l + yflSR cos d ( 8 )
PhaseErrRms= PhaseErrRms=
π π
上述合成信号等效 MPSK信号的 PhaseErrPeak可以通过如下公 式 （9 )计算得到： The PhaseErrPeak of the above synthetic signal equivalent MPSK signal can be calculated by the following formula (9):
需要说明的是， 以上公式中 /5？的单位均是线性的， 而不以 dB 为单位， 可以溯源到功率的计量标准。 It should be noted that /5 in the above formula? The units are linear, not dB, and can be traced to the power measurement standard.
由此可以看出， 上述合成信号等效 MPSK 信号的误差参量 PhaseErrRms , PhaseErrPeak, MagErrRms , EvmRms , MagErrPeak和 EvmPeak 均是与该合成信号所包含的第二连续波信号功率与第一连 续波信号功率的比值 /5？有关， 而 /5？可以溯源到高频功率标准， 也 就是说， 通过上述方法产生的合成信号等效 MPSK信号的误差参量 是可以溯源的。 并且， 通过调节 即可实现对所生成合成信号等效 It can be seen that the error parameters PhaseErrRms, PhaseErrPeak, MagErrRms, EvmRms, MagErrPeak and EvmPeak of the above-mentioned composite signal equivalent MPSK signal are the power of the second continuous wave signal and the power of the first continuous wave signal included in the synthesized signal. Ratio /5? Related, and /5? It can be traced to the high frequency power standard, that is, the error parameter of the synthetic signal equivalent MPSK signal generated by the above method is traceable. And, by adjusting, the equivalent of the generated synthetic signal can be achieved.
MPSK信号的误差参量 PhaseErrRms , PhaseErrPeak, MagErrRms , EvmRms , MagErrPeak和 EvmPeak的设置。 The error parameters of the MPSK signal are PhaseErrRms, PhaseErrPeak, MagErrRms, EvmRms, MagErrPeak and EvmPeak settings.
由此， 在生成上述合成信号后， 可以进一步执行步骤 24: 根据 上述公式 （4 ) 至 （8 ) 计算该合成信号等效 MPSK信号的误差参量， 包括： PhaseErrRms , PhaseErrPeak, MagErrRms , EvmRms , MagErrPeak 和 EvmPeak。 并在 VSA接收到上述合成信号后进一步执行步骤 25: 测量得到该合成信号等效 MPSK信号的误差参量， 并根据计算得到
的该合成信号等效 MPSK信号的误差参量以及测量得到的该合成信 号等效 MPSK信号的误差参量对 VSA进行校准。 Therefore, after generating the composite signal, step 24 may be further performed: calculating error parameters of the equivalent MPSK signal of the composite signal according to the above formulas (4) to (8), including: PhaseErrRms, PhaseErrPeak, MagErrRms, EvmRms, MagErrPeak, and EvmPeak. And after the VSA receives the composite signal, performing step 25: measuring an error parameter of the equivalent MPSK signal of the composite signal, and obtaining according to the calculation The composite signal is equivalent to the error parameter of the MPSK signal and the measured error parameter of the synthesized signal equivalent MPSK signal calibrates the VSA.
由于通过上述方法生成的等效 MPSK信号的误差参量既是可以 溯源又是可以设置的， 因此， 上述 VSA校准过程满足量值溯源要求。 Since the error parameter of the equivalent MPSK signal generated by the above method is both traceable and configurable, the above VSA calibration process satisfies the magnitude traceability requirement.
除了上述 VSA的校准方法之外， 本发明的实施例还公开了一种 数字解调误差参量计量***， 如图 4所示， 该***主要包括： In addition to the calibration method of the VSA described above, an embodiment of the present invention also discloses a digital demodulation error parameter measurement system. As shown in FIG. 4, the system mainly includes:
连续波信号发生器，用于生成载波频率为第一频率 与第二频率 之和 + Λ或差 -Λ的连续波信号 Cc (t) ,其中第一频率 大于第二 频率/ a continuous wave signal generator for generating a continuous wave signal C c (t) having a carrier frequency of a sum of a first frequency and a second frequency + Λ or a difference - ,, wherein the first frequency is greater than the second frequency /
VSA, 用于接收连续波信号发生器所生成的连续波信号， 测量所 接收连续波信号等效 MPSK信号的误差参量， 其中， VSA的载波频 率设置为第一频率^ , 解调模式设置为 MPSK, 符号速率设置为第二 频率/的 倍^ , 其中， M为正整数。 The VSA is configured to receive the continuous wave signal generated by the continuous wave signal generator, and measure an error parameter of the equivalent MPSK signal of the received continuous wave signal, wherein the carrier frequency of the VSA is set to the first frequency ^, and the demodulation mode is set to MPSK , the symbol rate is set to the second frequency / times ^, where M is a positive integer.
本发明的实施例还公开了另一种数字解调频率误差参量计量系 统， 如图 5所示， 该***主要包括： Another embodiment of the present invention also discloses another digital demodulation frequency error parameter measurement system. As shown in FIG. 5, the system mainly includes:
连续波信号发生器，用于生成载波频率为第一频率 与第二频率 Λ的和或差以及误差频率 /S之和的连续波信号，其中第一频率 大于 第二频率 Λ , 误差频率^小于第二频率 Λ的二分之一； a continuous wave signal generator for generating a continuous wave signal having a carrier frequency of a sum or difference of a first frequency and a second frequency 以及 and an error frequency / S , wherein the first frequency is greater than the second frequency Λ, and the error frequency is less than One-half of the second frequency Λ;
功分器，用于将连续波信号发生器生成的连续波信号分为曱路连 续波信号和乙路连续波信号； a power splitter for dividing the continuous wave signal generated by the continuous wave signal generator into a chopped continuous wave signal and an E continuous wave signal;
VSA, 用于接收曱路连续波信号， 测量所接收曱路连续波信号等 效 MPSK信号的频率误差， 得到频率误差的测量 其中， VSA 的载波频率设置为第一频率， 解调模式设置为 MPSK, 符号速率设置 为第二频率的 M倍， 其中， M为正整数； The VSA is configured to receive the chopped continuous wave signal, measure the frequency error of the equivalent MPSK signal of the received choppy continuous wave signal, and obtain a frequency error measurement, wherein the VSA carrier frequency is set to the first frequency, and the demodulation mode is set to MPSK , the symbol rate is set to M times the second frequency, where M is a positive integer;
频率计， 用于接收乙路连续波信号， 测量得到的乙路连续波信号
的频率值 Λ。 Frequency meter, used to receive the continuous wave signal of the B road, and measure the continuous wave signal of the B road The frequency value is Λ.
上述数字解调误差参量计量***， 还应当进一步包括： 原子钟， 用于为所述连续波信号发生器和频率计提供稳定的时钟信号。 较佳 地， 上述原子钟为铷原子钟。 The above digital demodulation error parametric metering system should further include: an atomic clock for providing a stable clock signal for the continuous wave signal generator and the frequency meter. Preferably, the atomic clock is a cesium atomic clock.
本发明的实施例还公开了又一种数字解调误差参量计量***，如 图 6所示， 该***主要包括： Another embodiment of the present invention also discloses a digital demodulation error parameter measurement system. As shown in FIG. 6, the system mainly includes:
第一连续波信号发生器，用于生成载波频率为第一频率 与第二 频率 Λ之和 + Λ或差 -Λ的第一连续波信号 ccl (ή , 其中第一频率 Λ大于第二频率 a first continuous wave signal generator for generating a first continuous wave signal c cl (where the first frequency Λ is greater than the second frequency) with a carrier frequency of a sum of the first frequency and the second frequency + + Λ or a difference Λ
第二连续波信号发生器，用于生成载波频率为第一频率 与第三 频率 ΔΛ之和 + Δ 或差 fd -Afd的第二连续波信号 cC2 (ή , 其中第一频 率 大于第三频率 ΔΛ ; a second continuous wave signal generator for generating a second continuous wave signal c C2 having a carrier frequency of a sum of a first frequency and a third frequency ΔΛ + Δ or a difference f d -Af d (ή, wherein the first frequency is greater than the first Three frequency ΔΛ;
合路器，用于合并第一连续波信号发生器生成的第一连续波信号 ccl (t)和第二连续波信号发生器生成的第二连续波信号 cC2 (t) , 得到合 成信号； a combiner for combining the first continuous wave signal c cl (t) generated by the first continuous wave signal generator and the second continuous wave signal c C2 (t) generated by the second continuous wave signal generator to obtain a composite signal ;
VSA , 用于接收合路器输出的合成信号， 测量所接收合成信号等 效 MPSK信号的误差参量，其中， VS A的载波频率设置为第一频率 ， 解调模式设置为 MPSK, 符号速率设置为第二频率 Λ的 M倍 其 中， M为正整数。 The VSA is configured to receive a composite signal outputted by the combiner, and measure an error parameter of the equivalent MPSK signal of the received composite signal, wherein the carrier frequency of the VS A is set to the first frequency, the demodulation mode is set to MPSK, and the symbol rate is set to M times the second frequency 其中 where M is a positive integer.
由此， 可以将通过上述公式（4 )至（8 )计算得到的该合成信号 等效 MPSK信号的各个误差参量的值与 VSA测量得到的所接收合成 信号等效 MPSK信号的各个误差参量进行比对， 即实现对 VSA的校 准。 Thereby, the values of the respective error parameters of the synthesized MPSK signal obtained by the above formulas (4) to (8) can be compared with the respective error parameters of the equivalent MPSK signal of the received composite signal obtained by the VSA measurement. Yes, the calibration of the VSA is achieved.
更进一步， 为了防止两个连续波信号发生器之间的馈通， 上述数 字解调误差参量计量***还可以进一步包括：
连接在第一连续波信号发生器和合路器之间的第一隔离器Further, in order to prevent feedthrough between two continuous wave signal generators, the digital demodulation error parameter metering system may further include: a first isolator connected between the first continuous wave signal generator and the combiner
( Isolator ) , 用于隔离第一连续波信号发生器和第二连续波信号； 连接在第二连续波信号发生器和合路器之间的第二隔离器 ( Isolator ) , 用于隔离第二连续波信号发生器和第一连续波信号。 (Isolator) for isolating the first continuous wave signal generator and the second continuous wave signal; a second isolator (Isolator) connected between the second continuous wave signal generator and the combiner for isolating the second continuous The wave signal generator and the first continuous wave signal.
上述数字解调误差参量计量***还可以进一步包括：连接在第二 连续波信号发生器和合路器之间或连接在第二隔离器和合路器之间 的衰减器， 用于调整第二连续波信号输出到 VSA的功率。 The above digital demodulation error parametric metering system may further comprise: an attenuator connected between the second continuous wave signal generator and the combiner or connected between the second isolator and the combiner for adjusting the second continuous wave signal The power output to the VSA.
下面通过实验数据说明上述对 VSA的校准方法的准确度和可信 度。 在本次实验中， 使用两台安捷伦公司 （Agilent ) 的 E8257D信号 源作为第一连续波信号发生器和第二连续波信号发生器；使用 Agilent 的 E4440A频语分析仪 +89600矢量分析软件作为 VSA。 The accuracy and reliability of the above calibration method for VSA are explained below through experimental data. In this experiment, two Agilent E8257D sources were used as the first continuous wave signal generator and the second continuous wave signal generator; Agilent's E4440A frequency analyzer + 89600 vector analysis software was used as the VSA. .
下述表 1和表 2分别显示了在第一连续波信号频率 999MHz (第 一频率为 1000MHz, 第二频率为 ΙΜΗζ ) , 第二连续波信号频率为 999.499MHz (第三频率为 0.501ΜΗζ ) , 干扰频偏比为 A=501/1000 时，不同 ISR下上述合成信号等效 MPSK信号的 EvmRms、 EvmPeak, MagErrRms、 MagErrPeak, PhaseErrRms , PhaseErrPeak 误差参量的 计算值和测量误差， 其中， 测量误差为 VSA的测量值与计算值之间 误差与计算值的比值。 VSA的载波频率设置为 1000MHz, 调制模式 设置为 QPSK。 另外， 由于上述误差参量计算值是依据 根据理论 公式计算得到的， 因此， 上述计算值也是该合成信号等效 MPSK信 号各个误差参量的实际值。 Tables 1 and 2 below show the frequency of the first continuous wave signal at 999 MHz (the first frequency is 1000 MHz, the second frequency is ΙΜΗζ), and the second continuous wave signal frequency is 999.499 MHz (the third frequency is 0.501 ΜΗζ). When the interference frequency offset ratio is A=501/1000, the calculated values and measurement errors of the EvmRms, EvmPeak, MagErrRms, MagErrPeak, PhaseErrRms, and PhaseErrPeak error parameters of the above-mentioned composite signal equivalent MPSK signals under different ISRs, where the measurement error is VSA The ratio of the error between the measured value and the calculated value to the calculated value. The carrier frequency of the VSA is set to 1000MHz and the modulation mode is set to QPSK. In addition, since the above-mentioned error parameter calculation value is calculated according to the theoretical formula, the above calculated value is also the actual value of each error parameter of the equivalent MPSK signal of the composite signal.
测量误差 （％) 0.294 0.357 0.335 0.289 0.307 0.289Measurement error (%) 0.294 0.357 0.335 0.289 0.307 0.289
MagErrRms计算 MagErrRms calculation
值 （％ ) 6.285 7.055 7.918 8.886 9.972 11.188 测量误差 （％) 0.014 0.005 -0.013 -0.036 -0.069 -0.107 Value (%) 6.285 7.055 7.918 8.886 9.972 11.188 Measurement error (%) 0.014 0.005 -0.013 -0.036 -0.069 -0.107
MagErrPeak计 MagErrPeak meter
算值 （％ ) 9.272 10.447 11.774 13.274 14.969 16.886 测量误差 （％) 0.185 0.270 0.324 0.249 0.272 0.274 Calculated value (%) 9.272 10.447 11.774 13.274 14.969 16.886 Measurement error (%) 0.185 0.270 0.324 0.249 0.272 0.274
PhaseErrRms计 PhaseErrRms meter
算值 ( degree ) 3.625 4.072 4.575 5.141 5.781 6.504 测量误差 Calculation (degree) 3.625 4.072 4.575 5.141 5.781 6.504 Measurement error
( degree ) 0.003 -0.001 -0.006 -0.016 -0.032 -0.050 ( degree ) 0.003 -0.001 -0.006 -0.016 -0.032 -0.050
PhaseErrPeak计 PhaseErrPeak meter
算值 ( degree ) 5.1 13 5.739 6.442 7.232 8.120 9.119 测量误差 Calculation ( degree ) 5.1 13 5.739 6.442 7.232 8.120 9.119 Measurement error
( degree ) 0.229 0.242 0.200 0.207 0.213 0.253 表 1 ( degree ) 0.229 0.242 0.200 0.207 0.213 0.253 Table 1
ISR(dB) -15 -14 -13 -12 -11 -10ISR(dB) -15 -14 -13 -12 -11 -10
EvmRms计算 EvmRms calculation
17.58 19.66 21.98 24.55 27.39 30.51 值 （％ ) 17.58 19.66 21.98 24.55 27.39 30.51 Value (%)
测量误差 （％) 0.006 -0.013 -0.035 -0.037 -0.079 -0.055Measurement error (%) 0.006 -0.013 -0.035 -0.037 -0.079 -0.055
EvmPeak计算 EvmPeak calculation
19.053 21.500 24.262 27.375 30.877 34.805 值 （％ ) 19.053 21.500 24.262 27.375 30.877 34.805 Value (%)
测量误差 （％) 0.250 0.237 0.223 0.193 0.192 0.247Measurement error (%) 0.250 0.237 0.223 0.193 0.192 0.247
MagErrRms计 MagErrRms meter
算值 （％ ) 12.553 14.082 15.796 17.715 19.864 22.268 测量误差 （％) -0.181 -0.273 -0.401 -0.555 -0.794 -1.067 Calculated value (%) 12.553 14.082 15.796 17.715 19.864 22.268 Measurement error (%) -0.181 -0.273 -0.401 -0.555 -0.794 -1.067
MagErrPeak计 MagErrPeak meter
算值 （％ ) 19.053 21.500 24.262 27.375 30.877 34.805 测量误差 （％) 0.245 0.214 0.194 0.178 0.182 0.212 Calculated value (%) 19.053 21.500 24.262 27.375 30.877 34.805 Measurement error (%) 0.245 0.214 0.194 0.178 0.182 0.212
PhaseErrRms计 PhaseErrRms meter
算值 ( degree ) 7.322 8.251 9.308 10.517 11.908 13.517 测量误差 Calculation (degree) 7.322 8.251 9.308 10.517 11.908 13.517 Measurement error
( degree ) -0.086 -0.132 -0.194 -0.272 -0.404 -0.558 ( degree ) -0.086 -0.132 -0.194 -0.272 -0.404 -0.558
PhaseErrPeak PhaseErrPeak
计算值 10.243 11.509 12.937 14.548 16.370 18.435
( degree ) Calculated value 10.243 11.509 12.937 14.548 16.370 18.435 ( degree )
测量误差 Measurement error
( degree ) 0.200 0.270 0.162 0.242 0.160 0.186 表 2 ( degree ) 0.200 0.270 0.162 0.242 0.160 0.186 Table 2
图 7显示了不同 ISR下两路连续波信号合并后等效 MPSK信号 的误差参量 EvmRms 的计算值和测量值。 其中， 三角形标识的曲线 代表 EvmRms的测量值； 正方形标识的曲线代表 EvmRms的测量值。 Figure 7 shows the calculated and measured values of the error parameter EvmRms of the equivalent MPSK signal after combining two continuous wave signals under different ISRs. Wherein, the curve indicated by the triangle represents the measured value of EvmRms; the curve identified by the square represents the measured value of EvmRms.
图 8显示了不同 下两路连续波信号合并后等效 MPSK信号 的误差参量 EvmPeak 的计算值和测量值。 其中， 三角形标识的曲线 代表 EvmPeak的测量值；正方形标识的曲线代表 EvmPeak的测量值。 Figure 8 shows the calculated and measured values of the error parameter EvmPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals. Among them, the curve of the triangle mark represents the measured value of EvmPeak; the curve of the square mark represents the measured value of EvmPeak.
图 9显示了不同 ISR下两路连续波信号合并后等效 MPSK信号 的误差参量 MagErrRms的计算值和测量值。 其中， 三角形标识的曲 线代表 MagErrRms的测量值； 正方形标识的曲线代表 MagErrRms的 测量值。 Figure 9 shows the calculated and measured values of the error parameter MagErrRms of the equivalent MPSK signal after combining two continuous wave signals under different ISRs. Among them, the triangle marked curve represents the measured value of MagErrRms; the square marked curve represents the measured value of MagErrRms.
图 10显示了不同 下两路连续波信号合并后等效 MPSK信号 的误差参量 MagErrPeak的计算值和测量值。 其中， 三角形标识的曲 线代表 MagErrPeak 的测量值； 正方形标识的曲线代表 MagErrPeak 的测量值。 Figure 10 shows the calculated and measured values of the error parameter MagErrPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals. Among them, the triangle marked curve represents the measured value of MagErrPeak; the square marked curve represents the measured value of MagErrPeak.
图 1 1显示了不同 下两路连续波信号合并后等效 MPSK信号 的误差参量 PhaseErrRms的计算值和测量值。 其中， 三角形标识的曲 线代表 PhaseErrRms的测量值； 正方形标识的曲线代表 PhaseErrRms 的测量值。 Figure 1 shows the calculated and measured values of the error parameter PhaseErrRms of the equivalent MPSK signal after the combination of the two lower continuous wave signals. The curve identified by the triangle represents the measured value of PhaseErrRms; the curve identified by the square represents the measured value of PhaseErrRms.
图 12显示了不同 下两路连续波信号合并后等效 MPSK信号 的误差参量 PhaseErrPeak的计算值和测量值。 其中， 三角形标识的曲 线代表 PhaseErrPeak的测量值； 正方形标识的曲线代表 PhaseErrPeak 的测量值。
图 13显示了 / =- 10(1Β时， 不同 y¾情况下 VSA输出的 4PSK解 调矢量图。 图 13显示的是一种典型的试验现象。 Figure 12 shows the calculated and measured values of the error parameter PhaseErrPeak of the equivalent MPSK signal after the combination of the two lower continuous wave signals. The curve indicated by the triangle represents the measured value of PhaseErrPeak; the curve identified by the square represents the measured value of PhaseErrPeak. Figure 13 shows the 4PSK demodulation vector of the VSA output for different y3⁄4 cases at / = - 10 (Figure 1). Figure 13 shows a typical experimental phenomenon.
从表 1和表 2中的数据可以看出， 由于测量误差很小， 说明该合 成信号等效 MPSK信号各个误差参量的计算值 （也即实际值） 和测 量值是非常接近的。 另外， 从图 5至图 10中的曲线也可以看出， 该 等效 MPSK信号误差参量的计算值 （也即实际值） 和测量值也是非 常接近的。 由此， 可以说明通过上述方法生成的两路连续波信号合并 后所生成合成信号的等效 MPSK信号的各个误差参量是可以溯源也 可以根据 ISR设 1的, 因此， 通过上述方法对 VSA进行校准可以得 到较高的准确度和可信度。 As can be seen from the data in Tables 1 and 2, since the measurement error is small, the calculated value (ie, the actual value) of each error parameter of the equivalent MPSK signal of the synthesized signal is very close to the measured value. In addition, it can be seen from the curves in Fig. 5 to Fig. 10 that the calculated value (i.e., the actual value) and the measured value of the equivalent MPSK signal error parameter are also very close. Therefore, it can be explained that each error parameter of the equivalent MPSK signal of the synthesized signal generated by combining the two continuous wave signals generated by the above method is traceable or can be set according to ISR. Therefore, the VSA is calibrated by the above method. Can get higher accuracy and credibility.
有鉴于此，本发明提供了一个使用两路信号连续波信号的合成信 号得到等效的存在误差的数字调制信号，且该数字调制信号的 6个误 差参量 EvmRms、 EvmPeak , MagErrRms、 MagErrPeak , PhaseErrRms 和 PhaseErrPeak是可以精确设定、计算的。 由于该合成信号的误差参 量最终可以溯源到两路连续波信号功率的比值，从而能够使用这种信 号对矢量解调误差参量进行准确校准。 因此， 本发明可以同时解决计 量溯源和误差设置两个问题。 In view of the above, the present invention provides a digitally modulated signal having an equivalent error value using a composite signal of a two-way signal continuous wave signal, and the six error parameters of the digital modulated signal are EvmRms, EvmPeak, MagErrRms, MagErrPeak, PhaseErrRms and PhaseErrPeak can be accurately set and calculated. Since the error parameter of the composite signal can ultimately be traced to the ratio of the power of the two continuous wave signals, the signal can be accurately calibrated using this signal. Therefore, the present invention can solve both the problem of measurement traceability and error setting.
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等， 均应包含在本发明的保护范围之内。
The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.
Claims
1、 一种数字解调误差参量计量方法， 其特征在于， 包括： 生成载波频率为第一频率与第二频率之和或差的连续波信号，其 中第一频率大于第二频率； A digital demodulation error parameter measurement method, comprising: generating a continuous wave signal whose carrier frequency is a sum or a difference between a first frequency and a second frequency, wherein the first frequency is greater than the second frequency;
将所生成的连续波信号作为等效数字调制信号输入到矢量信号 分析仪 VSA的输入端， 其中， VSA的载波频率设置为第一频率， 解 调模式设置为 M进制相移键控 MPSK, 符号速率设置为第二频率的 M倍， 其中， M为正整数。 The generated continuous wave signal is input to the input end of the vector signal analyzer VSA as an equivalent digital modulation signal, wherein the carrier frequency of the VSA is set to the first frequency, and the demodulation mode is set to the M-ary phase shift keying MPSK. The symbol rate is set to M times the second frequency, where M is a positive integer.
2、 一种数字解调频率误差参量计量方法， 其特征在于， 包括： 生成载波频率为第一频率与第二频率的和或差与误差频率之和 的连续波信号， 其中第一频率大于第二频率， 误差频率小于第二频率 的二分之一； 2. A digital demodulation frequency error parameter measurement method, comprising: generating a continuous wave signal having a carrier frequency of a sum of a first frequency and a second frequency and a sum of a difference and an error frequency, wherein the first frequency is greater than Two frequencies, the error frequency is less than one-half of the second frequency;
将所生成的连续波信号通过功分器分为曱路连续波信号和乙路 连续波信号； The generated continuous wave signal is divided into a continuous wave signal and a continuous wave signal by a power splitter;
将曱路连续波信号作为等效数字调制信号输入到矢量信号分析 仪 VSA的输入端， 获得曱路连续波信号等效 M进制相移键控 MPSK 信号的频率误差的测量值， 其中， VSA的载波频率设置为第一频率， 解调模式设置为 MPSK, 符号速率设置为第二频率的 M倍， 其中， M 为正整数； The chopped continuous wave signal is input as an equivalent digital modulated signal to the input end of the vector signal analyzer VSA, and the measured value of the frequency error of the equivalent M-ary phase shift keying MPSK signal of the chopped continuous wave signal is obtained, wherein, the VSA The carrier frequency is set to the first frequency, the demodulation mode is set to MPSK, and the symbol rate is set to M times of the second frequency, where M is a positive integer;
将乙路连续波信号输入到频率计， 得到频率计测量得到的频率 值， 并根据频率计测量得到的频率值计算频率误差的实际值； 以及根 据频率误差的实际值对以及 VSA 测量得到的频率误差的测量值对 VSA进行校准。 Input the continuous wave signal of the B channel to the frequency meter to obtain the frequency value measured by the frequency meter, and calculate the actual value of the frequency error according to the frequency value measured by the frequency meter; and the actual value pair according to the frequency error and the frequency measured by the VSA The measured value of the error calibrates the VSA.
3、 根据权利要求 2所述的方法， 其特征在于， 所述根据频率计 测量得到的频率值计算频率误差的实际值包括：将所述频率计测量得 到的频率值减去第一频率与第二频率的和或差，将得到的差值作为所 述频率误差的实际值。 3. The method according to claim 2, wherein said frequency meter Calculating the obtained frequency value The actual value of the frequency error includes: subtracting the sum of the first frequency and the second frequency from the frequency value measured by the frequency meter, and using the obtained difference as the actual value of the frequency error. .
4、 一种数字解调误差参量计量方法， 其特征在于， 包括： 生成载波频率为第一频率与第二频率之和或差的第一连续波信 号， 其中第一频率大于第二频率； A digital demodulation error parameter measurement method, comprising: generating a first continuous wave signal whose carrier frequency is a sum or a difference between a first frequency and a second frequency, wherein the first frequency is greater than the second frequency;
生成载波频率为第一频率与第三频率之和或差的第二连续波信 号， 其中第一频率大于第三频率； Generating a second continuous wave signal whose carrier frequency is the sum or difference between the first frequency and the third frequency, wherein the first frequency is greater than the third frequency;
将第一连续波信号和第二连续波信号合并为一路合成信号作为 等效数字调制信号输入到 VSA的输入端， 其中， VSA的载波频率设 置为第一频率， 解调模式设置为 M进制相移键控 MPSK, 符号速率 设置为第二频率的 Λ /倍， 其中， 为正整数。 Combining the first continuous wave signal and the second continuous wave signal into one combined signal as an equivalent digital modulation signal input to the input end of the VSA, wherein the carrier frequency of the VSA is set to the first frequency, and the demodulation mode is set to the M-ary Phase shift keying MPSK, the symbol rate is set to Λ / times of the second frequency, where is a positive integer.
5、 根据权利要求 4所述的方法， 其特征在于， 所述的合并为将 第一连续波信号和第二连续波信号相加。 5. Method according to claim 4, characterized in that said merging adds the first continuous wave signal and the second continuous wave signal.
6、 根据权利要求 4所述的方法， 其特征在于， 进一步包括： 在将第一连续波信号和第二连续波信号合并为一路合成信号后， 计算所述合成信号等效 MPSK信号的误差参量； 6. The method according to claim 4, further comprising: calculating an error parameter of the equivalent MPSK signal of the composite signal after combining the first continuous wave signal and the second continuous wave signal into one combined signal ;
VSA 在接收到所述合成信号后， 测量得到所述合成信号等效 MPSK信号的误差参量， 并根据计算得到的所述合成信号等效 MPSK 信号的误差参量以及测量得到的误差参量对 VSA进行校准。 After receiving the synthesized signal, the VSA measures an error parameter of the equivalent MPSK signal of the composite signal, and calibrates the VSA according to the calculated error parameter of the equivalent MPSK signal of the composite signal and the measured error parameter. .
7、 根据权利要求 6所述的方法， 其特征在于， 所述误差参量包 括： 误差矢量幅度均方根值 EvmRms; The method according to claim 6, wherein the error parameter comprises: an error vector magnitude root mean square value EvmRms;
所述计算所述合成信号等效 MPSK信号的误差参量包括： 根据 如下公式计算所述合成信号等效 MPSK信号的 EvmRms: EvmRms 2 - 2 ' The calculating an error parameter of the composite signal equivalent MPSK signal comprises: calculating an EvmRms of the composite signal equivalent MPSK signal according to the following formula: EvmRms 2 - 2 '
l + ISR l + ISR
其中， ISR为输入 VSA的第二连续波信号功率与第一连续波信 号功率的比值。 The ISR is the ratio of the power of the second continuous wave signal input to the VSA to the power of the first continuous wave signal.
8、 根据权利要求 6所述的方法， 其特征在于， 所述误差参量包 括： 幅度误差的均方根值 MagErrRms； 8. The method according to claim 6, wherein the error parameter comprises: a root mean square value of the amplitude error MagErrRms;
所述计算所述合成信号等效 MPSK信号的误差参量包括： 根据 如下公式计算所述合成信号等效 MPSK信号的 MagErrRms: j l + ISR + 2 fISR cos θάθ The calculating the error parameter of the composite signal equivalent MPSK signal comprises: calculating MagErrRms of the synthetic signal equivalent MPSK signal according to the following formula: j l + ISR + 2 fISR cos θ ά θ
MagErrRms 2 (1 + ISR) - 2 /lSR + l-^- 其中， ISR为输入 VSA的第二连续波信号功率与第一连续波信 号功率的比值。 MagErrRms 2 (1 + ISR) - 2 /lSR + l-^- where ISR is the ratio of the power of the second continuous wave signal of the input VSA to the power of the first continuous wave signal.
9、 根据权利要求 6所述的方法， 其特征在于， 所述误差参量包 括： 幅度误差峰值 MagErrPeak； 9. The method according to claim 6, wherein the error parameter comprises: an amplitude error peak MagErrPeak;
所述计算所述合成信号等效 MPSK信号的误差参量包括： 根据 如下公式计算所述合成信号等效 MPSK信号的 MagErrPeak: The calculating the error parameter of the composite signal equivalent MPSK signal comprises: calculating MagErrPeak of the synthetic signal equivalent MPSK signal according to the following formula:
MagErrPeak = 1 - 
MagErrPeak = 1 -
yllSR + 1 yllSR + 1
其中， ISR为输入 VSA的第二连续波信号功率与第一连续波信 号功率的比值。 The ISR is the ratio of the power of the second continuous wave signal input to the VSA to the power of the first continuous wave signal.
10、 根据权利要求 6所述的方法， 其特征在于， 所述误差参量包 括： 误差矢量幅度峰值 EvmPeak; The method according to claim 6, wherein the error parameter comprises: an error vector amplitude peak EvmPeak;
所述计算所述合成信号等效 MPSK信号的误差参量包括： 根据 如下公式计算所述合成信号等效 MPSK信号的 EvmPeak: EvmPeak=lThe calculating an error parameter of the composite signal equivalent MPSK signal comprises: calculating an EvmPeak of the synthetic signal equivalent MPSK signal according to the following formula: EvmPeak=l
其中， ISR为输入 VSA的第二连续波信号功率与第一连续波信 号功率的比值。 The ISR is the ratio of the power of the second continuous wave signal input to the VSA to the power of the first continuous wave signal.
11、 根据权利要求 6所述的方法， 其特征在于， 所述误差参量包 括： 相位误差均方根值 PhaseErrRms； The method according to claim 6, wherein the error parameter comprises: a phase error rms value PhaseErrRms;
所述计算所述合成信号等效 MPSK信号的误差参量包括： 根据 如下公式计算所述合成信号等效 MPSK信号的 PhaseErrRms: arcsm- άθ The calculating the error parameter of the composite signal equivalent MPSK signal comprises: calculating PhaseErrRms of the composite signal equivalent MPSK signal according to the following formula: arcsm- ά θ
l + fJSR cos 0 l + fJSR cos 0
PhaseErrRms= PhaseErrRms=
π π
其中， ISR为输入 VSA的第二连续波信号功率与第一连续波信 号功率的比值。 The ISR is the ratio of the power of the second continuous wave signal input to the VSA to the power of the first continuous wave signal.
12、 根据权利要求 6所述的方法， 其特征在于， 所述误差参量包 括： 相位误差峰值 PhaseErrPeak; 12. The method according to claim 6, wherein the error parameter comprises: a phase error peak PhaseErrPeak;
所述计算所述合成信号等效 MPSK信号的误差参量包括： 根据 如下公式计算所述合成信号等效 MPSK信号的 PhaseErrPeak: The calculating the error parameter of the composite signal equivalent MPSK signal comprises: calculating PhaseErrPeak of the synthetic signal equivalent MPSK signal according to the following formula:
PhaseErrPeak= arc sin PhaseErrPeak= arc sin
其中， ISR为输入 VSA的第二连续波信号功率与第一连续波信 号功率的比值。 The ISR is the ratio of the power of the second continuous wave signal input to the VSA to the power of the first continuous wave signal.
13、 根据权利要求 5至 12任一项所述的方法， 其特征在于， 所 述 小于 -8dB; The method according to any one of claims 5 to 12, wherein the said is less than -8 dB;
若在 VSA中一次解调分析用于统计结果的符号数为 Nx M , Νβά 为整数， 其中， Α为第三频率与第二频率的比值。 If the number of symbols used for statistical results in the VSA is Nx M, Νβ ά is an integer, where Α is the ratio of the third frequency to the second frequency.
14、 一种数字解调误差参量计量***， 其特征在于， 包括： 连续波信号发生器，用于生成载波频率为第一频率与第二频率之 和或差的连续波信号， 其中第一频率大于第二频率； 14. A digital demodulation error parameter measurement system, comprising: a continuous wave signal generator for generating a carrier frequency for a first frequency and a second frequency And a poor continuous wave signal, wherein the first frequency is greater than the second frequency;
矢量信号分析仪 VSA, 用于接收连续波信号发生器所生成的连 续波信号， 测量所接收连续波信号等效 M进制相移键控 MPSK信号 的误差参量， 其中， VSA 的载波频率设置为第一频率， 解调模式设 置为 MPSK, 符号速率设置为第二频率的 Λ 倍， 其中， Λ 为正整数。 The vector signal analyzer VSA is configured to receive the continuous wave signal generated by the continuous wave signal generator, and measure the error parameter of the equivalent M-ary phase shift keying MPSK signal of the received continuous wave signal, wherein the carrier frequency of the VSA is set to At the first frequency, the demodulation mode is set to MPSK, and the symbol rate is set to Λ times the second frequency, where Λ is a positive integer.
15、 一种数字解调频率误差参量计量***， 其特征在于， 包括： 连续波信号发生器，用于生成载波频率为第一频率与第二频率的 和或差与误差频率之和的连续波信号， 其中第一频率大于第二频率， 误差频率小于第二频率的二分之一； 15. A digital demodulation frequency error parametric metering system, comprising: a continuous wave signal generator for generating a continuous wave having a carrier frequency of a sum of a first frequency and a second frequency and a sum of a difference and an error frequency; a signal, wherein the first frequency is greater than the second frequency, and the error frequency is less than one-half of the second frequency;
功分器，用于将连续波信号发生器生成的连续波信号分为曱路连 续波信号和乙路连续波信号； a power splitter for dividing the continuous wave signal generated by the continuous wave signal generator into a chopped continuous wave signal and an E continuous wave signal;
矢量信号分析仪 VSA, 用于接收曱路连续波信号， 测量所接收 曱路连续波信号等效 M进制相移键控 MPSK信号的频率误差， 得到 频率误差的测量值， 其中， VSA 的载波频率设置为第一频率， 解调 模式设置为 MPSK, 符号速率设置为第二频率的 M倍， 其中， M 正整数； The vector signal analyzer VSA is configured to receive the chopped continuous wave signal, measure the frequency error of the equivalent M-ary phase shift keying MPSK signal of the received chopped continuous wave signal, and obtain a measured value of the frequency error, wherein the carrier of the VSA The frequency is set to the first frequency, the demodulation mode is set to MPSK, and the symbol rate is set to M times of the second frequency, where M is a positive integer;
频率计， 用于接收乙路连续波信号， 测量得到的第二连续波信号 的频率值。 The frequency meter is configured to receive the continuous wave signal of the B channel, and measure the frequency value of the obtained second continuous wave signal.
16、 根据权利要求 15所述的***， 其特征在于， 进一步包括： 原子钟， 用于为所述连续波信号发生器和频率计提供稳定的时钟信 号。 16. The system of claim 15 further comprising: an atomic clock for providing a stable clock signal to said CW signal generator and the frequency meter.
17、 一种数字解调误差参量计量***， 其特征在于， 包括： 第一连续波信号发生器，用于生成载波频率为第一频率与第二频 率之和或差的第一连续波信号， 其中第一频率大于第二频率； A digital demodulation error parameter measurement system, comprising: a first continuous wave signal generator for generating a first continuous wave signal having a carrier frequency of a sum or a difference between a first frequency and a second frequency, Wherein the first frequency is greater than the second frequency;
第二连续波信号发生器，用于生成载波频率为第一频率与第三频 率之和或差的第二连续波信号， 其中第一频率大于第三频率； 合路器，用于合成第一连续波信号发生器生成的第一连续波信号 和第二连续波信号发生器生成的第二连续波信号得到合成信号； a second continuous wave signal generator for generating a carrier frequency for the first frequency and the third frequency a second continuous wave signal having a sum or a difference, wherein the first frequency is greater than the third frequency; a combiner for synthesizing the first continuous wave signal and the second continuous wave signal generator generated by the first continuous wave signal generator Generating a second continuous wave signal to obtain a composite signal;
矢量信号分析仪 VSA, 用于接收合路器输出的合成信号， 测量 所接收合成信号等效 M进制相移键控 MPSK信号的误差参量，其中， VSA的载波频率设置为第一频率，解调模式设置为 MPSK,符号速率 设置为第二频率的 M倍， 其中， M为正整数。 The vector signal analyzer VSA is configured to receive the composite signal output by the combiner, and measure the error parameter of the equivalent M-ary phase shift keying MPSK signal of the received composite signal, wherein the carrier frequency of the VSA is set to the first frequency, The mode is set to MPSK, and the symbol rate is set to M times the second frequency, where M is a positive integer.
18、 根据权利要求 17所述的***， 其特征在于， 进一步包括： 第一隔离器， 连接在第一连续波信号发生器和合路器之间， 用于 隔离第二连续波信号和第一连续波信号发生器； The system according to claim 17, further comprising: a first isolator connected between the first continuous wave signal generator and the combiner for isolating the second continuous wave signal and the first continuous Wave signal generator
第二隔离器， 连接在第二连续波信号发生器和合路器之间， 用于 隔离第一连续波信号和第二连续波信号发生器。 The second isolator is connected between the second continuous wave signal generator and the combiner for isolating the first continuous wave signal and the second continuous wave signal generator.
19、 根据权利要求 17所述的***， 其特征在于， 进一步包括： 衰减器， 连接在第二连续波信号发生器和合路器之间， 用于调整 第二连续波信号输出到 VSA的功率。 19. The system of claim 17, further comprising: an attenuator coupled between the second continuous wave signal generator and the combiner for adjusting the power output by the second continuous wave signal to the VSA.
20、 根据权利要求 18所述的***， 其特征在于， 进一步包括： 衰减器， 连接在第二隔离器和合路器之间， 用于调整第二连续波 信号输出到 VSA的功率。 20. The system of claim 18, further comprising: an attenuator coupled between the second isolator and the combiner for adjusting the power output by the second continuous wave signal to the VSA.
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