CN112583497A - Phase measurement device and method based on real number single-tone signal - Google Patents
Phase measurement device and method based on real number single-tone signal Download PDFInfo
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- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
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- H04B17/00—Monitoring; Testing
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- H04B17/20—Monitoring; Testing of receivers
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- H—ELECTRICITY
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Abstract
The invention discloses a phase measurement device and method based on real number single tone signals, which comprises the following steps: a signal generation module: a DDS signal generator for generating a single-tone sine wave digital signal; a digital-to-analog conversion module: the single-tone sine wave digital signal is used for converting the single-tone sine wave digital signal generated by the signal generation module into a radio frequency analog signal; the reference link: the radio frequency analog signal receiving module is used for receiving the radio frequency analog signal output by the digital-to-analog conversion module and providing reference for a link to be tested; an analog-to-digital conversion module: the device comprises two ADC (analog-to-digital converter) which are used for respectively converting the output of a reference link and the output of a link to be tested into digital signals; a filtering module: the system comprises two zero-phase filters which are intercepted based on a Hanning window and are used for respectively filtering digital signals of a reference link and a link to be tested which are output by an analog-to-digital conversion module; the signal processing module: and the FPGA is used for solving the phase difference of the digital signals of the reference link and the link to be tested after filtering.
Description
Technical Field
The invention relates to a phase measurement device, in particular to a phase measurement device and method based on real number single tone signals.
Background
In a phased array antenna system, a desired beam sweep is obtained by adjusting the phase of each antenna element. The phased array units are large in number, the structure is often asymmetric due to machining accuracy and the like, the device is inconsistent, in addition, due to the fact that the amplitude and the phase of each antenna unit are different from expected values due to the fact that the amplitude and the phase of each antenna unit are different from the expected values due to the fact that the antenna fluctuates and mutual coupling among the antenna units, the array performance cannot reach the optimal working state, even cannot reach the required technical conditions, and communication quality is affected. Therefore, after the phased array antenna is assembled, measurement and calibration are required, and the purpose is to eliminate related errors as much as possible so that the array performance can reach the required technical condition or the optimal working state.
The currently popular phase measurement is a comparative phase method, which generates a single tone signal to respectively pass through a reference path and a path to be measured, and then obtains the phase difference between the two paths. Typically, the generated tone signals are I/Q signals generated by an FPGA and then the tone signals are generated using a transceiver. The method has the disadvantages of insufficient measurement precision and relatively high hardware cost.
Disclosure of Invention
In order to solve the problem of insufficient measurement precision in the prior art, the invention provides a phase measurement device and method based on real number single tone signals.
The invention is realized by the following technical scheme:
a phase measurement apparatus based on real single-tone signals, comprising:
a signal generation module: for generating a single tone sine wave digital signal;
a digital-to-analog conversion module: the single-tone sine wave digital signal is used for converting the single-tone sine wave digital signal generated by the signal generation module into a radio frequency analog signal;
the reference link: the radio frequency analog signal receiving module is used for receiving the radio frequency analog signal output by the digital-to-analog conversion module and providing reference for a link to be tested;
an analog-to-digital conversion module: the device is used for converting the outputs of the reference link and the link to be tested into digital signals respectively;
a filtering module: the digital signal processing module is used for respectively filtering the digital signals of the reference link and the link to be tested output by the analog-to-digital conversion module;
the signal processing module: and the phase difference solving device is used for solving the phase difference of the digital signals of the reference link and the link to be tested after filtering.
On the basis of the scheme, the method further comprises the following steps: the signal generation module is a DDS signal generator which can be realized by an FPGA.
On the basis of the scheme, the method further comprises the following steps: the analog-to-digital conversion module comprises two ADC analog-to-digital converters.
On the basis of the scheme, the method further comprises the following steps: the filtering module comprises two zero-phase filters which are intercepted based on a Hanning window, and the zero-phase filters can be realized by an FPGA.
On the basis of the scheme, the method further comprises the following steps: the signal processing module is an FPGA.
A phase measurement method based on real tone signals is characterized in that the phase measurement method is applied to the phase measurement device based on the real tone signals, and comprises the following steps:
s1: the DDS signal generator outputs a signal with frequency f0The single tone sine wave digital signal of (a);
s2: signal frequency of f0The single-tone sine wave digital signal is converted into a radio frequency analog signal through a DAC (digital-to-analog converter);
s3: the radio frequency analog signal generated by the DAC is simultaneously sent to the link to be tested and the reference link;
s4: the link to be tested and the reference link respectively output one path of signals and are respectively converted into digital signals through an ADC (analog-to-digital converter);
s5: the digital signals output by the two ADC analog-to-digital converters are respectively processed by a zero-phase filter based on Hanning window interception;
s6: outputs of two zero-phase filtersSending the output signals to an FPGA (field programmable gate array), respectively carrying out fast Fourier transform on the two paths of signals by the FPGA, solving the instantaneous phases of the two paths of signals in the frequency domain, and extracting the two paths of signals with the frequency f0Phase value theta of1(f0) And theta0(f0)；
S7: calculating the phase difference delta theta (f) between the reference link and the link to be measured0)：Δθ(f0)＝θ1(f0)-θ0(f0)。
Compared with the prior art, the invention has the following advantages and beneficial effects:
under the condition of high signal-to-noise ratio, the error of phase measurement in a phase difference range of-180 degrees to 180 degrees does not exceed +/-2 degrees, the phase measurement precision can reach 1 percent, and the precision is higher compared with the existing phase comparison method.
Compared with the phase calibration scheme in the prior art, the scheme of real signals is adopted, and a universal ADC chip can be selected for conversion from analog signals to digital signals, so that the hardware cost is reduced.
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A further understanding of the embodiments of the present invention may be obtained from the following claims of the invention and the following description of the preferred embodiments when taken in conjunction with the accompanying drawings. Individual features of the different embodiments shown in the figures may be combined in any desired manner in this case without going beyond the scope of the invention. In the drawings:
FIG. 1 is a data flow diagram of the present invention;
fig. 2 is a graph showing the relationship between the measurement error and the phase difference in example 3.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
in this embodiment, an apparatus for measuring a phase based on a real tone signal includes:
a signal generation module: the DDS signal generator can be realized by an FPGA and is used for generating a single-tone sine wave digital signal;
a digital-to-analog conversion module: the single-tone sine wave digital signal is used for converting the single-tone sine wave digital signal generated by the signal generation module into a radio frequency analog signal;
the reference link: the radio frequency analog signal receiving module is used for receiving the radio frequency analog signal output by the digital-to-analog conversion module and providing reference for a link to be tested;
an analog-to-digital conversion module: the device comprises two ADC (analog-to-digital converter) which are used for respectively converting the output of a reference link and the output of a link to be tested into digital signals;
a filtering module: the system comprises two zero-phase filters intercepted based on a Hanning window, wherein the zero-phase filters can be realized by an FPGA and are used for respectively filtering digital signals of a reference link and a link to be tested, which are output by an analog-to-digital conversion module;
the signal processing module: and the FPGA is used for solving the phase difference of the digital signals of the reference link and the link to be tested after filtering.
Example 2:
as shown in fig. 1, a method for measuring a phase based on a real tone signal is applied to the apparatus for measuring a phase based on a real tone signal, and includes the following steps:
s1: FPGA uses DDS to generate a signal with frequency f0The single tone sine wave digital signal of (a);
s2: signal frequency of f0The single-tone sine wave digital signal is converted into a radio frequency analog signal through a DAC (digital-to-analog converter);
s3: the radio frequency analog signal generated by the DAC is simultaneously sent to the link to be tested and the reference link;
s4: the link to be tested and the reference link respectively output one path of signals and are respectively converted into digital signals through an ADC (analog-to-digital converter);
s5: the digital signals output by the two ADC analog-to-digital converters are respectively processed by a zero-phase filter based on Hanning window interception;
s6: the output signals of the two zero-phase filters are sent to the FPGA, the FPGA carries out fast Fourier transform on the two paths of signals respectively to obtain the instantaneous phases of the two paths of signals under the frequency domain, and the two paths of signals are extracted under the condition that the frequency is f0Phase value theta of1(f0) And theta0(f0)；
S7: calculating the phase difference delta theta (f) between the reference link and the link to be measured0)：Δθ(f0)＝θ1(f0)-θ0(f0)。
Example 3:
the relation between the measurement error and the phase difference shown in fig. 2 can be obtained through theoretical algorithm simulation verification, wherein the abscissa is the actual angle difference of the single-tone signal, and the ordinate is the calculation error angle.
S1: the FPGA uses the DDS to generate a single-tone sine wave digital signal with the signal frequency of 36 MHz;
s2: the single-tone sine wave digital signal with the signal frequency of 36MHz is converted into a radio frequency analog signal through a DAC (digital-to-analog converter);
s3: the radio frequency analog signal generated by the DAC is sent to the link to be tested and the reference link at the same time, and delta theta (f) is generated through the link to be tested and the reference link0) Phase difference (phase difference change range-180 degree), SNR (signal to noise ratio) design of link>30；
S4: the link to be tested and the reference link respectively output one path of signals and are respectively converted into digital signals through an ADC (analog to digital converter), the sampling rate Fs of the ADC is 125MHz, and the quantization bit width of the ADC is 14 bit;
s5: the digital signals output by the two ADC analog-to-digital converters are respectively processed by a zero-phase filter based on Hanning window interception;
s6: the output signals of the two zero phase filters are sent to the FPGA, the FPGA carries out fast Fourier transform on the two paths of signals respectively to obtain the instantaneous phases of the two paths of signals under the frequency domain, and the two paths of signals are extractedAt a frequency f0Phase value theta of1(f0) And theta0(f0)；
S7: calculating the phase difference delta theta (f) between the reference link and the link to be measured0)：Δθ(f0)＝θ1(f0)-θ0(f0)。
Under the condition that SNR is 30dB, the phase difference ranges from-180 degrees to 180 degrees, and the calculation error is better than +/-2 degrees. The phase measurement precision can reach 1%. Meanwhile, the scheme of real signals is adopted, and compared with a common phase calibration scheme, a universal ADC chip can be selected for conversion from analog signals to digital signals, so that the hardware cost is reduced.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that are changed from the content of the present specification and the drawings, or are directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (8)
1. A phase measurement device based on real tone signals, comprising:
a signal generation module: for generating a single tone sine wave digital signal;
a digital-to-analog conversion module: the single-tone sine wave digital signal is used for converting the single-tone sine wave digital signal generated by the signal generation module into a radio frequency analog signal;
the reference link: the radio frequency analog signal receiving module is used for receiving the radio frequency analog signal output by the digital-to-analog conversion module and providing reference for a link to be tested;
an analog-to-digital conversion module: the device is used for converting the outputs of the reference link and the link to be tested into digital signals respectively;
a filtering module: the digital signal processing module is used for respectively filtering the digital signals of the reference link and the link to be tested output by the analog-to-digital conversion module;
the signal processing module: and the phase difference solving device is used for solving the phase difference of the digital signals of the reference link and the link to be tested after filtering.
2. The apparatus of claim 1, wherein the signal generating module is a DDS signal generator.
3. The apparatus of claim 2, wherein the DDS signal generator is implemented by FPGA.
4. The apparatus of claim 1, wherein the analog-to-digital conversion module comprises two ADC analog-to-digital converters.
5. The apparatus of claim 1, wherein the filtering module comprises two zero-phase filters with Hanning window clipping.
6. The apparatus of claim 5, wherein the two zero-phase filters are implemented by FPGA.
7. The apparatus of claim 1, wherein the signal processing module is an FPGA.
8. A method for measuring a phase based on a real tone signal, which is applied to the apparatus for measuring a phase based on a real tone signal according to any one of claims 1 to 7, comprising the steps of:
s1: the DDS signal generator outputs a signal with frequency f0The single tone sine wave digital signal of (a);
s2: signal frequency of f0The single-tone sine wave digital signal is converted into a radio frequency analog signal through a DAC (digital-to-analog converter)Number;
s3: the radio frequency analog signal generated by the DAC is simultaneously sent to the link to be tested and the reference link;
s4: the link to be tested and the reference link respectively output one path of signals and are respectively converted into digital signals through an ADC (analog-to-digital converter);
s5: the digital signals output by the two ADC analog-to-digital converters are respectively processed by a zero-phase filter based on Hanning window interception;
s6: the output signals of the two zero-phase filters are sent to the FPGA, the FPGA carries out fast Fourier transform on the two paths of signals respectively to obtain the instantaneous phases of the two paths of signals under the frequency domain, and the two paths of signals are extracted under the condition that the frequency is f0Phase value theta of1(f0) And theta0(f0)；
S7: calculating the phase difference delta theta (f) between the reference link and the link to be measured0)：Δθ(f0)＝θ1(f0)-θ0(f0)。
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