CN213398907U - Coupled real-time calibration multi-channel coherent signal simulation device - Google Patents
Coupled real-time calibration multi-channel coherent signal simulation device Download PDFInfo
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- CN213398907U CN213398907U CN202022193987.7U CN202022193987U CN213398907U CN 213398907 U CN213398907 U CN 213398907U CN 202022193987 U CN202022193987 U CN 202022193987U CN 213398907 U CN213398907 U CN 213398907U
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- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/406—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder
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Abstract
The utility model discloses a multichannel coherent signal simulation device for coupled real-time calibration, which comprises a plurality of arbitrary waveform generators, a coupled real-time amplitude and phase calibration module, a clock synchronization module and an industrial personal computer, wherein the arbitrary waveform generators are connected with the industrial personal computer through data lines, and the coupled real-time amplitude and phase calibration module is connected with the industrial personal computer and the clock synchronization module through data lines; the coupled real-time amplitude and phase calibration module comprises a local oscillator module, a power divider and a plurality of coupled calibration modules, the coupled calibration modules are respectively connected with the output ends of a plurality of random waveform generators in a one-to-one correspondence mode, the input end of the local oscillator module is connected with the output end of the clock synchronization module, the output end of the local oscillator module is connected with the input end of the power divider, and the output end of the power divider is connected with the down-conversion module. The utility model discloses can carry out the calibration of a plurality of passageways simultaneously, improve the efficiency of calibration.
Description
Technical Field
The utility model belongs to the technical field of radar signal processing, especially, relate to a multichannel coherent signal analogue means of real-time calibration of manifold type.
Background
In application occasions such as semi-physical simulation construction of a complex electromagnetic environment, radar of a phased array system, direction-finding positioning radar, test verification of multi-input multi-output (MIMO) communication and the like, multi-channel coherent signals need to be generated, the phase and amplitude of each path of output signals are strictly controlled, and otherwise, the credibility of a simulation effect and the precision of a test result are greatly influenced. In practical applications, factors such as frequency reference, triggering, and sampling clock all affect the coherence of multi-channel signals, and even the temperature of the connection cable, the frequency of the signals, and the usage environment of the device all affect the signals. In order to reduce the influence of the above factors, it is necessary to calibrate and compensate the amplitude and phase deviation of each channel generating the coherent signal, so as to improve the amplitude and phase consistency. Usually, a digital oscilloscope or a vector network analyzer is adopted to accurately measure the inherent phase and amplitude deviation among channels, and then the deviation is compensated in a signal predistortion mode so as to achieve the purpose of strict phase-coherent signals of all channels.
Chinese patent application "multichannel wide band signal coherent characteristic fast calibration system" (patent application No. CN 201910391423.3) discloses a multichannel coherent signal calibration system based on radio frequency switch matrix and multichannel data acquisition, which outputs the measured multichannel coherent signal to a radio frequency front end & signal conditioning module in a time-sharing manner through the combination of a plurality of sets of radio frequency switches for fast switching channels, converts the radio frequency signal to intermediate frequency for many times, sends the intermediate frequency to a multichannel data acquisition & signal processing board card for coherent characteristic measurement, and finally completes the reporting of coherent characteristics by built-in software, thereby finally realizing the fast calibration of the multichannel coherent signal. The essence of the method is that one channel is still selected as a reference channel, other channels are used as channels to be calibrated, the channels to be calibrated are quickly switched by the radio frequency switch matrix, and amplitude and phase parameters of the channels to be calibrated and the reference channels are compared, so that calibration is realized.
Disclosure of Invention
In order to solve the above problem, the present invention provides a multi-channel coherent signal simulator for real-time coupled calibration, which can dynamically test and calibrate the output multi-channel coherent signal in real time.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a coupled real-time calibration multi-channel coherent signal simulation device comprises a plurality of arbitrary waveform generators, a coupled real-time amplitude and phase calibration module, a clock synchronization module and an industrial personal computer, wherein the arbitrary waveform generators are connected with the industrial personal computer through data lines; the coupled real-time amplitude and phase calibration module comprises a local oscillator module, a power divider and a plurality of coupled calibration modules, wherein the coupled calibration modules are respectively connected with the output ends of a plurality of arbitrary waveform generators in a one-to-one correspondence manner, the input end of the local oscillator module is connected with the output end of the clock synchronization module, the output end of the local oscillator module is connected with the input end of the power divider, and the output end of the power divider is connected with the down-conversion module; each coupling calibration module consists of a directional coupler, a down-conversion module and an intermediate frequency receiving module which are connected in sequence, and the input end of the directional coupler is connected with the output end of the corresponding arbitrary waveform generator.
Further, the down-conversion module comprises a signal conditioning module, a mixer and a low-pass filter, a radio frequency port of the signal conditioning module is connected with an output end of the directional coupler, an output end of the signal conditioning module is connected with a radio frequency input end of the mixer, a local oscillator end of the mixer is connected with an output end of the power divider, and an intermediate frequency end is connected with an input end of the low-pass filter.
Furthermore, the intermediate frequency receiving module comprises a signal conditioning module and an a/D converter, an input end of the signal conditioning module is connected with an output end of the low-pass filter, an output end of the signal conditioning module is connected with an input end of the a/D converter, and an output end of the a/D converter outputs amplitude-phase data of one channel.
Further, the number of the power dividers is one or more than two, and the more than two power dividers adopt a cascade structure.
Due to the adoption of the technical scheme, the utility model discloses have following superiority:
the coupled multi-channel coherent signal simulation device for real-time calibration does not need to switch working modes, can be calibrated in a working state, realizes dynamic real-time calibration, ensures the quality of output signals, can calibrate a plurality of channels at the same time instead of switching a single channel, and improves the calibration efficiency; the radio frequency channel switching method of tradition adoption is owing to other ports of disconnection in the physical meaning, and radio frequency switch passageway isolation index has partly signal to reveal from other ports when relatively poor to come in, influences the calibration precision, and the utility model discloses no radio frequency signal is crosstalked between multichannel coherent signal analogue means's the passageway, and the calibration precision is high, has good popularization and application and worth.
Drawings
Fig. 1 is a block diagram of the multi-channel coherent signal simulator for coupled real-time calibration according to the present invention;
FIG. 2 is a block diagram of the coupled real-time amplitude and phase calibration module of FIG. 1;
FIG. 3 is a signal flow diagram of a single coupling calibration block of FIG. 2;
fig. 4 is a schematic diagram of amplitude difference between the test coupling end and the output end of the directional coupler.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1-2, the coupled real-time calibrated multi-channel coherent signal simulation device comprises a plurality of arbitrary waveform generators, a coupled real-time amplitude and phase calibration module, a clock synchronization module and an industrial personal computer, wherein the arbitrary waveform generators are connected with the industrial personal computer through data lines and are used for generating multi-channel synchronous coherent signals under the control of the industrial personal computer; the coupling type real-time amplitude and phase calibration module is used for calibrating the multichannel synchronous phase-coherent signals and reporting calibration data to an industrial personal computer; the clock synchronization module is used for providing a reference clock for the arbitrary waveform generator and the coupling type real-time amplitude-phase calibration module and realizing phase synchronization; the industrial personal computer is used for correcting the amplitude and the phase of the output signal of each channel according to the calibration data reported by the coupling type amplitude-phase calibration module; wherein the content of the first and second substances,
the coupling type real-time amplitude and phase calibration module comprises a local oscillation module, a power divider and a plurality of coupling calibration modules, and the plurality of coupling calibration modules are respectively connected with the output ends of a plurality of arbitrary waveform generators in a one-to-one correspondence manner; each coupling calibration module consists of a directional coupler, a down-conversion module and an intermediate frequency receiving module, wherein the input end of the directional coupler is connected with the output end of an arbitrary waveform generator corresponding to the directional coupler, the down-conversion module comprises a signal conditioning module, a mixer and a low-pass filter, the signal conditioning module consists of an n-shaped attenuator and an amplifier which are connected in series, a radio frequency port of the signal conditioning module, namely the input end of the n-shaped attenuator, is connected with the output end of the directional coupler, the output end of the signal conditioning module, namely the output end of the amplifier, is connected with the radio frequency input end of the mixer, a local oscillator end of the mixer is connected with the output end of the power divider, and an intermediate frequency end of the mixer is connected with the; the intermediate frequency receiving module comprises a signal conditioning module and an A/D converter, the signal conditioning module is formed by connecting an n-type attenuator and an amplifier in series, a radio frequency port of the signal conditioning module, namely the input end of the n-type attenuator, is connected with the output end of the low-pass filter, the output end of the signal conditioning module, namely the output end of the amplifier, is connected with the input end of the A/D converter, and the output end of the A/D converter outputs amplitude-phase data of one channel; the input end of the local oscillator module is connected with the output end of the clock synchronization module, and the output end of the local oscillator module is connected with the input end of the power divider.
The power divider is one or more than two, and the power dividers are in a cascade structure.
The clock synchronization module uses a constant temperature crystal oscillator (OXCO) and a phase-locked circuit to output a high-stability signal with the frequency of 10MHz and the frequency precision of 0.1ppm as a reference clock signal of each arbitrary waveform generator, a mixer local oscillator and an ADC acquisition module, and ensures the coherent and synchronous generation, down-conversion and digital acquisition of each channel signal.
The industrial personal computer generates control instructions such as amplitude, phase, frequency and the like according to preset requirements and transmits the control instructions to any waveform generator of a corresponding channel; each arbitrary waveform generator provides reference by the same clock synchronization module to realize clock synchronization so as to ensure the coherence of output signals, and generates multi-channel coherent radio frequency signals according to the instructions of the industrial personal computer; in order to ensure the coherence of each channel, a local oscillation source of a local oscillation module is synchronous with an external reference clock signal, outputs a local oscillation signal through a local oscillation ring, and inputs the local oscillation signal into a plurality of coupling calibration modules after being divided by a power divider, so as to provide a local oscillation signal for a down-conversion module of each channel; as shown in fig. 3, the rf signals at each port are input into the coupled real-time amplitude-phase calibration module and are directly output through the through port of the directional coupler in the corresponding coupled calibration module, a small number of signals traveling along the "through" path can be measured by the coupled port, and the power loss (insertion loss) between the signals output through the through port and the input signals is small, so that the amplitude of the output signals is not greatly affected; the directional coupler is a passive device and is regarded as a linear relation between a signal of the coupling port and an output signal, so that the amplitude and the phase of the measured signal of the coupling port can reflect the amplitude and the phase of the output signal of the through port; the radio frequency signal is output by a coupling port of the directional coupler, attenuated, amplified and conditioned by a signal conditioning module with low noise, mixed with a local oscillator signal by a mixer, and down-converted by a low-pass filter; the signal is changed into an intermediate frequency signal after down-conversion for many times, the intermediate frequency signal is input into an intermediate frequency receiving module, is attenuated, amplified and conditioned with low noise through a signal conditioning module, is sampled by an analog-to-digital (ADC) converter, and is converted into a digital signal, so that the real-time amplitude and phase information of each channel signal is obtained and transmitted to an industrial personal computer; the industrial personal computer calculates and processes the amplitude and phase information of the acquired radio frequency signals of each channel, obtains the relative values of the amplitude and the phase, compares the relative values with the preset amplitude and the preset phase, compensates the relative values, regenerates an amplitude and phase control instruction, and adjusts the amplitude and the phase of the signals generated by the arbitrary waveform generator, thereby realizing the real-time and dynamic calibration of the output multi-channel coherent signals and ensuring the amplitude and phase consistency of the output signals of each channel.
The industrial personal computer processes the acquired waveform data of each channel in a frequency domain (FFT operation), and obtains the amplitude of the output signal of the coupling port by searching the maximum value of the frequency spectrumAMP 1Phase ofφ 1. The relative values of the amplitudes and phases of the coupled port and the through port must be measured first to compensate by using the information,and further obtain the amplitude and phase of the through port. The test method is as shown in fig. 4, one port (for example, port 3) of the four-port vector network analyzer is used as an excitation source, and an input port of the directional coupler is connected, an output port and a coupling port of the directional coupler are respectively connected with port 2 and port 4 of the vector network analyzer, and the measurement parameters are set to be Wave quantities (Wave Quantity) including b4 (P3 s) and b2 (P3 s). If the amplitude difference is tested, the display Format is changed into Magnitude (dB); if the Phase difference value is tested, changing the display Format into Phase; finally, using Trace Math function, the difference is obtained: math = b4 (P3 s)/b 2 (P3 s). According to the measured amplitude difference delta between the output port and the coupling portAMPPhase difference value deltaφAnd measured magnitude of the coupled portAMP 1Phase dataφ 1The amplitude of the output port can be obtained (AMP out) And phase (φ out) Information, namely:AMP out= AMP 1+ΔAMP、φ out =φ 1 +Δφ。
the above is only the preferred embodiment of the present invention, not the limitation of the present invention, without departing from the spirit and scope of the present invention, all should belong to the patent protection scope of the present invention in the equal variation and modification made by the claims of the present invention.
Claims (4)
1. A multi-channel coherent signal simulation device for coupled real-time calibration is characterized in that: the system comprises a plurality of arbitrary waveform generators, a coupled real-time amplitude and phase calibration module, a clock synchronization module and an industrial personal computer, wherein the arbitrary waveform generators are connected with the industrial personal computer through data lines; the coupled real-time amplitude and phase calibration module comprises a local oscillator module, a power divider and a plurality of coupled calibration modules, wherein the coupled calibration modules are respectively connected with the output ends of a plurality of arbitrary waveform generators in a one-to-one correspondence manner, the input end of the local oscillator module is connected with the output end of the clock synchronization module, the output end of the local oscillator module is connected with the input end of the power divider, and the output end of the power divider is connected with the down-conversion module; each coupling calibration module consists of a directional coupler, a down-conversion module and an intermediate frequency receiving module which are connected in sequence, and the input end of the directional coupler is connected with the output end of the corresponding arbitrary waveform generator.
2. The coupled real-time calibrated multi-channel coherent signal simulator of claim 1, wherein: the down-conversion module comprises a signal conditioning module, a frequency mixer and a low-pass filter, wherein a radio frequency port of the signal conditioning module is connected with an output end of the directional coupler, an output end of the signal conditioning module is connected with a radio frequency input end of the frequency mixer, a local oscillator end of the frequency mixer is connected with an output end of the power divider, and an intermediate frequency end of the frequency mixer is connected with an input end of the low-pass filter.
3. The coupled real-time calibrated multi-channel coherent signal simulator of claim 1, wherein: the frequency receiving module comprises a signal conditioning module and an A/D converter, the input end of the signal conditioning module is connected with the output end of the low-pass filter, the output end of the signal conditioning module is connected with the input end of the A/D converter, and the output end of the A/D converter outputs amplitude-phase data of one channel.
4. The coupled real-time calibrated multi-channel coherent signal simulator of claim 1, wherein: the power divider is one or more than two, and the more than two power dividers adopt a cascade structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114866164A (en) * | 2022-06-27 | 2022-08-05 | 长沙学院 | Method and device for measuring characteristics of radio frequency channel containing frequency conversion module |
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| CN114070704B (en) * | 2021-11-15 | 2023-11-10 | 四川九洲空管科技有限责任公司 | Multichannel transceiver of anti-collision device and amplitude-phase calibration method |
| CN114157372B (en) * | 2021-12-07 | 2024-04-16 | 中电科思仪科技股份有限公司 | Phase and insertion loss measuring device and method |
| CN115166382B (en) * | 2022-07-06 | 2023-06-27 | 成都中创锐科信息技术有限公司 | Multi-radiation-source coherent signal simulation device and method |
| CN116578164B (en) * | 2023-07-13 | 2023-09-29 | 中星联华科技（北京）有限公司 | Multichannel coherent signal generating device and multichannel coherent signal source |
| CN116991198B (en) * | 2023-09-28 | 2023-12-26 | 深圳市鼎阳科技股份有限公司 | Waveform generator, multi-signal channel delay correction method and medium |
| CN117097266A (en) * | 2023-10-16 | 2023-11-21 | 南京威翔科技有限公司 | Ku frequency band variable bandwidth mixing module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114866164A (en) * | 2022-06-27 | 2022-08-05 | 长沙学院 | Method and device for measuring characteristics of radio frequency channel containing frequency conversion module |
| CN114866164B (en) * | 2022-06-27 | 2024-05-03 | 长沙学院 | Method and device for measuring characteristics of radio frequency channel with frequency conversion module |
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