CN113125883A - Performance test system and method for third-order digital correlator - Google Patents

Performance test system and method for third-order digital correlator Download PDF

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CN113125883A
CN113125883A CN202110341641.3A CN202110341641A CN113125883A CN 113125883 A CN113125883 A CN 113125883A CN 202110341641 A CN202110341641 A CN 202110341641A CN 113125883 A CN113125883 A CN 113125883A
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digital correlator
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于哲
刘浩
牛立杰
韩东浩
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National Space Science Center of CAS
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Abstract

The invention belongs to the technical field of space microwave remote sensing, and particularly relates to a performance test system and a method for a three-order digital correlator, which comprises the following steps: the data parameter setting module is used for simultaneously sending setting parameters of multiple paths of required excitation noise signals to the data generation module; the data generation module is used for correspondingly generating four excitation noise signals with arbitrary waveforms according to the setting parameters of the sent excitation noise signals; the data sending and processing module is used for respectively carrying out digital-to-analog conversion on the four excitation noise signals to respectively obtain corresponding noise analog signals, and sequentially inputting the noise analog signals to the three-order digital correlator to be tested; and testing the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested to obtain corresponding test results, and completing the performance test of the three-order digital correlator.

Description

Performance test system and method for third-order digital correlator
Technical Field
The invention belongs to the technical field of space microwave remote sensing, and particularly relates to a performance test system and method for a three-order digital correlator.
Background
The synthetic aperture radiometer can equivalently amplify the true aperture antenna by using an antenna array formed by the small-aperture antenna, thereby reducing the cost and the processing difficulty of the antenna. The digital correlator is a key component for realizing quantitative measurement of the synthetic aperture radiometer, the core function of the digital correlator is to realize complex correlation operation between any two channels, and the accuracy of the complex correlation result of the three-order digital correlator directly determines the accuracy and precision of the measurement result of the synthetic aperture microwave radiometer system, thereby influencing the key performance index of the radiometer system, therefore, a method for testing the performance of the multi-channel digital correlator is needed. However, most of the existing performance test methods for the correlator of the synthetic aperture radiometer are performed along with system tests, so that quantitative evaluation is difficult to perform, and an effective means for performing quantitative evaluation test on the digital correlator is lacked. The digital correlator mainly has the functions of digitally quantizing a noise signal through an ADC chip, then performing parallel complex correlation operation in the digital correlator, and transmitting a correlation result to an upper computer in a data form. The synthetic aperture radiometer has a large number of elements and the number of correlator elements is proportional to the square of the number of antenna elements, so that a digital correlator is used for the synthetic aperture radiometer. The larger the quantization order of the digital correlator, the smaller the quantization noise and the higher the accuracy, but the power consumption and the cost are greatly increased, and the gate number of the digital correlator is increased, thereby increasing the complexity of the synthetic aperture radiometer.
At present, a third-order quantization correlator is adopted, the signal-to-noise ratio of the third-order quantization correlator can reach 81% of that of an analog correlator, only high quantization level and low quantization level exist, and a circuit is simple.
In the existing test system for the digital correlator, the electronic devices forming the test system are more, the structure is complex, the system complexity is very high, the noise source uses a diode, an amplifier and a filter, the crosstalk among channels is easily caused, the amplifier is self-excited, the distortion of the output signal of the synthetic aperture radiometer is caused, the correlation degree of the output signal is greatly reduced, and the phase traversal of 0-360 degrees can not be carried out for the test of the phase difference of the correlated noise of the digital correlator.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a performance testing method for a three-order digital correlator, which can realize high-precision quantitative testing and evaluation of the three-order digital correlator; the input end of the test system is provided with the multi-channel digital-analog converter, noise signals with any correlation degree can be quantitatively input, and various index parameters of the sampling rate, the bandwidth, the variance and the integral duration of the noise signals can be set at will. The memory of the multichannel digital-to-analog converter has a large-capacity storage space, the output signal is long enough, and the correlation precision of the output signal can meet the test requirement of a high-precision digital correlator.
The invention provides a performance test system for a third-order digital correlator, which is arranged on a console and comprises: the device comprises a data parameter setting module, a data generating module and a data sending and processing module;
the data parameter setting module is used for simultaneously sending setting parameters of multiple paths of required excitation noise signals to the data generation module;
the data generation module is used for correspondingly generating a first excitation noise signal, a second excitation noise signal, a third excitation noise signal and a fourth excitation noise signal with arbitrary waveforms according to the setting parameters of the transmitted excitation noise signal;
the data sending and processing module is used for respectively carrying out digital-to-analog conversion on the first excitation noise signal, the second excitation noise signal, the third excitation noise signal and the fourth excitation noise signal to respectively obtain corresponding noise analog signals, and sequentially inputting the noise analog signals to the three-order digital correlator to be tested; and testing the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested to obtain corresponding test results, and completing the performance test of the three-order digital correlator.
As an improvement of the above technical solution, the test system further includes: and the evaluation analysis module is used for evaluating and analyzing the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested respectively according to the obtained test result.
As an improvement of the above technical solution, the data generation module includes:
the first excitation signal generating unit is used for correspondingly generating a multipath uncorrelated white Gaussian noise band limiting signal with the bandwidth of 100M and the integration time length of 2.4s according to the setting parameters of the excitation noise signal sent by the data transmitting and processing terminal to obtain a plurality of groups of first excitation noise signals;
the second excitation signal generating unit is used for correspondingly generating a multi-channel white Gaussian noise band limiting signal with the bandwidth of 100M, the integration time length of which is 2.4s, the correlation coefficient of which is increased from 0 and is increased by taking 0.1 as a step, as a plurality of groups of second excitation noise signals according to the setting parameters of the excitation noise signals sent by the data transmitting and processing terminal;
a third excitation signal generating unit for correspondingly generating an integration time length of 2.4s and a correlation coefficient of (0: 10) according to the setting parameters of the excitation noise signal sent by the data transmitting and processing terminal-4：5×10-4) The multi-channel white Gaussian noise band-limited signals with the bandwidth of 100M are used as a plurality of groups of third excitation noise signals; and
and the fourth excitation signal generating unit is used for correspondingly generating two groups of white gaussian noise band-limited signals CHi signals and CHj signals with analog correlation coefficients of 0.04+ j0.02 according to the setting parameters of the excitation noise signals sent by the data transmitting and processing terminal, and the two groups of white gaussian noise band-limited signals CHi signals and CHj signals are used as fourth excitation noise signals.
As an improvement of the above technical solution, the data transmission module includes:
the first data sending and processing unit is used for carrying out digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of first excitation noise signals to obtain multiple paths of first noise analog signals, inputting each path of first noise analog signals to the three-order digital correlator to be tested, and testing the correlation offset performance of the three-order digital correlator to be tested to obtain a plurality of first test results;
the second data sending and processing unit is used for carrying out digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of second excitation noise signals to obtain a plurality of paths of second noise analog signals, and inputting each path of second analog signals to the three-order digital correlator to be tested; testing the correlation efficiency performance of the three-order digital correlator to be tested to obtain a plurality of second test results;
the third data sending and processing unit is used for performing digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of third excitation noise signals to obtain multiple paths of third noise analog signals, and inputting each path of third analog signals to the three-order digital correlator to be tested; testing the linearity performance of the three-order digital correlator to be tested to obtain a third test result;
the fourth data sending and processing unit is used for performing digital-to-analog conversion on each path of Gaussian white noise band-limited signals in the third excitation noise signals to obtain multiple paths of third noise analog signals, and inputting each path of third noise analog signals to the third-order digital correlator to be tested; testing the stability performance of the three-order digital correlator to be tested to obtain a fourth test result; and
the fifth data sending and processing unit is used for performing digital-to-analog conversion on each path of Gaussian white noise band-limited signals in the fourth excitation noise signals to obtain multiple paths of fourth noise analog signals, and inputting each path of fourth noise analog signals to the third-order digital correlator to be tested; and testing the related phase error performance of the third-order digital correlator to be tested to obtain a fifth test result.
As an improvement of the above technical solution, a specific process of the first data sending and processing unit is as follows:
randomly selecting a group of first excitation noise signals, carrying out digital-to-analog conversion on two paths of uncorrelated white Gaussian noise band-limited signals in the group of first excitation noise signals to obtain two paths of first noise analog signals, and inputting the first noise analog signal of each path to two k and j channels of a three-order digital correlator to be tested; wherein, the two channels k and j are optional two channels;
calculating a first analog correlation coefficient for the set of first excitation noise signals:
Figure BDA0002999290480000041
wherein the content of the first and second substances,
Figure BDA0002999290480000042
the first analog correlation coefficient of k, j two channels of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskjThe cross correlation of two channels k, j of a three-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000043
wherein s isk(n) is a digital sequence of a first analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj(n) is a digital sequence of a first analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points:
Figure BDA0002999290480000044
Figure BDA0002999290480000045
Figure BDA0002999290480000046
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjThe quantization threshold value of the j channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000047
Figure BDA0002999290480000048
Figure BDA0002999290480000049
wherein phi is a probability distribution function of standard normal distribution;
Figure BDA00029992904800000410
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA00029992904800000411
Figure BDA0002999290480000051
Figure BDA0002999290480000052
wherein the content of the first and second substances,
Figure BDA0002999290480000053
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
calculating the three-order analog correlation coefficient to be measured of the group of first excitation noise signals according to the real analog correlation coefficient calculated by the group of first excitation noise signals in the three-order digital correlatorCorrelation offset u of digital correlatorbias：
Figure BDA0002999290480000054
Wherein the content of the first and second substances,
Figure BDA0002999290480000055
performing soft simulation calculation on the third-order quantized data of the group of first excitation noise signals in a third-order digital correlator to be tested to obtain a real analog correlation coefficient;
the correlation offset u of the third-order digital correlator to be testedbiasAs a first test result;
and repeating the process, inputting each group of first excitation noise signals to the three-order digital correlator to be tested, and carrying out correlation offset test on the three-order digital correlator to be tested to obtain correlation offsets of the multiple three-order digital correlators to be tested, thereby obtaining multiple first test results.
As an improvement of the above technical solution, a specific process of the second data sending and processing unit is as follows:
randomly selecting a group of second excitation noise signals, carrying out digital-to-analog conversion on two paths of related white Gaussian noise band-limited signals in the group of second excitation noise signals to obtain multiple paths of second noise analog signals, and inputting the second analog signal of each path to two channels k and j of a three-order digital correlator to be detected; wherein, the two channels k and j are optional two channels;
calculating a second analog correlation coefficient for the set of second excitation noise signals:
Figure BDA0002999290480000056
wherein the content of the first and second substances,
Figure BDA0002999290480000057
the second analog correlation coefficient of two channels of k, j of the third-order digital correlator to be detected; c. C1Is the first conversion coefficient；c3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskj-1The first cross correlation of two k, j channels of a three-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000061
wherein s isk-1(n) is a digital sequence of a second analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj-1(n) is a digital sequence of a second analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points:
Figure BDA0002999290480000062
Figure BDA0002999290480000063
Figure BDA0002999290480000064
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjThe quantization threshold value of the j channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000065
Figure BDA0002999290480000066
Figure BDA0002999290480000067
wherein phi is a probability distribution function of standard normal distribution;
Figure BDA0002999290480000068
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000069
Figure BDA00029992904800000610
Figure BDA00029992904800000611
wherein the content of the first and second substances,
Figure BDA00029992904800000612
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
using the first test result ubiasAnd further calculating the correlation efficiency eta of the third-order digital correlator to be tested of the group of second excitation noise signals:
Figure BDA0002999290480000071
taking the correlation efficiency eta of the three-order digital correlator to be tested as a second test result;
and repeating the process, inputting each group of second excitation noise signals to the three-order digital correlator to be tested, and testing the correlation efficiency of the three-order digital correlator to be tested to obtain the correlation efficiency of the multiple three-order digital correlators to be tested, thereby obtaining multiple second test results.
As an improvement of the above technical solution, a specific process of the third data sending and processing unit is as follows:
randomly selecting a group of third excitation noise signals, carrying out digital-to-analog conversion on two paths of related white Gaussian noise band-limited signals in the group of third excitation noise signals to obtain multiple paths of third noise analog signals, and inputting the third analog signal of each path to two channels k and j of a three-order digital correlator to be tested; wherein, the two channels k and j are optional two channels;
calculating a third analog correlation coefficient for the set of third excitation noise signals:
Figure BDA0002999290480000072
wherein the content of the first and second substances,
Figure BDA0002999290480000073
the third analog correlation coefficient of two channels of k, j of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskj-2The second cross correlation of two channels k, j of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000074
wherein s isk-2(n) is a digital sequence of a third analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj-2(n) is a digital sequence of a third analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points: n is the length of the noise sequence;
Figure BDA0002999290480000075
Figure BDA0002999290480000076
Figure BDA0002999290480000077
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjThe quantization threshold value of the j channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000081
Figure BDA0002999290480000082
Figure BDA0002999290480000083
wherein phi is a probability distribution function of standard normal distribution;
Figure BDA0002999290480000084
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000085
Figure BDA0002999290480000086
Figure BDA0002999290480000087
wherein the content of the first and second substances,
Figure BDA0002999290480000088
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
repeating the above process, inputting each group of third excitation noise signals to the three-order digital correlator to be tested to obtain analog correlation coefficients of multiple three-order digital correlators to be tested, and inputting ubiasAs a standard value, screening and correcting analog correlation coefficients of a plurality of to-be-detected third-order digital correlators to obtain processed analog correlation coefficients; will be provided with
Figure BDA0002999290480000089
And the correlation degree between the processed simulation correlation coefficient is used as a third test result.
As an improvement of the above technical solution, a specific process of the fourth data sending and processing unit is as follows:
randomly selecting a group of third excitation noise signals, carrying out digital-to-analog conversion on two paths of related white Gaussian noise band-limited signals in the group of third excitation noise signals to obtain multiple paths of third noise analog signals, and inputting the third analog signal of each path to two channels k and j of a three-order digital correlator to be tested; wherein, the two channels k and j are optional two channels;
calculating a third analog correlation coefficient for the set of third excitation noise signals:
Figure BDA0002999290480000091
wherein the content of the first and second substances,
Figure BDA0002999290480000092
the third analog correlation coefficient of two channels of k, j of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskj-2The second cross correlation of two channels k, j of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000093
wherein s isk-2(n) is a digital sequence of a third analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj-2(n) is a digital sequence of a third analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points:
Figure BDA0002999290480000094
Figure BDA0002999290480000095
Figure BDA0002999290480000096
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjThe quantization threshold value of the j channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000097
Figure BDA0002999290480000098
Figure BDA0002999290480000099
wherein phi is a probability distribution function of standard normal distribution;
Figure BDA00029992904800000910
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000101
Figure BDA0002999290480000102
Figure BDA0002999290480000103
wherein the content of the first and second substances,
Figure BDA0002999290480000104
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
repeating the process, inputting each group of third excitation noise signals to the to-be-detected third-order digital correlator to obtain analog correlation coefficients of the to-be-detected third-order digital correlators, and screening and correcting the analog correlation coefficients of the to-be-detected third-order digital correlators to obtain processed analog correlation coefficients; then, a rectangular coordinate system is established so as to
Figure BDA0002999290480000105
And forming a point by using the processed simulation correlation coefficient as a vertical coordinate on the horizontal coordinate to obtain a plurality of points, measuring the dispersion degree of data distribution of the plurality of points by combining with STD operation to obtain stability, and using the stability as a fourth test result.
As an improvement of the above technical solution, a specific process of the fifth data sending and processing unit is as follows:
adopting a Labview arbitrary correlation signal generation algorithm, and generating two quantitative (0-360 DEG) Gaussian white noise band-limited signals with phase offset theta by a data generation module to serve as a CHi signal and a CHj signal;
respectively carrying out digital-to-analog conversion on the CHi signal and the CHj signal to obtain two paths of fourth noise analog signals, respectively carrying out digital-to-analog conversion on each path of fourth noise analog signal to obtain corresponding fourth analog signals, carrying out autocorrelation and cross-correlation operation processing, and carrying out analog-to-digital conversion to obtain ii(n)、qi(n)、ij(n) and qj(n) four digital signals:
calculating the phase of the CHi signal and the CHj signal
Figure BDA0002999290480000106
Figure BDA0002999290480000107
Wherein M isijPerforming soft simulation calculation on a CHi signal and a CHj signal of a third-order digital correlator to be detected to obtain a real complex simulation correlation coefficient;
Figure BDA0002999290480000108
the real part of a real complex simulation correlation coefficient is obtained by soft simulation calculation of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure BDA0002999290480000109
performing soft simulation calculation on a third-order digital correlator CHi signal to be detected and a CHj signal to obtain an imaginary part of a real complex simulation correlation coefficient;
Figure BDA0002999290480000111
Figure BDA0002999290480000112
Figure BDA0002999290480000113
Figure BDA0002999290480000114
Figure BDA0002999290480000115
Figure BDA0002999290480000116
wherein the content of the first and second substances,
Figure BDA0002999290480000117
analog correlation coefficients of an I path and an I path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure BDA0002999290480000118
analog correlation coefficients of a Q path and a Q path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure BDA0002999290480000119
analog correlation coefficients of an I path and a Q path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure BDA00029992904800001110
analog correlation coefficients between a Q path and an I path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected; i.e. ii(n) is a digital signal in the CHi signal; q. q.si(n) is another digital signal in the CHi signal; i.e. ij(n) is CHjOne path of digital signal in the signal; q. q.sj(n) is another digital signal in the CHj signal;
calculating the measured phases of the CH1 signal and the CH2 signal
Figure BDA00029992904800001111
Figure BDA00029992904800001112
Wherein M is1 ijActually measured complex analog correlation coefficients of two groups of fourth excitation noise signals of a CHi signal and a CHj signal of a third-order digital correlator to be detected;
Figure BDA00029992904800001113
real parts of actually measured complex analog correlation coefficients of two groups of fourth excitation noise signals of a CHi signal and a CHj signal of a third-order digital correlator to be measured;
Figure BDA00029992904800001114
the imaginary parts of actually measured complex analog correlation coefficients of two groups of fourth excitation noise signals of a CHi signal and a CHj signal of a third-order digital correlator to be detected;
and further determining the correlation phase error of the third-order digital correlator to be detected:
Figure BDA0002999290480000121
and taking the correlation phase error of the third-order digital correlator to be tested as a fifth test result.
The invention also provides a performance test method for the third-order digital correlator, which comprises the following steps:
the data parameter setting module simultaneously sends setting parameters of multiple paths of required excitation noise signals to the data generation module;
the data generation module correspondingly generates a first excitation noise signal, a second excitation noise signal, a third excitation noise signal and a fourth excitation noise signal with arbitrary waveforms according to the setting parameters of the transmitted excitation noise signal;
and the data sending and processing module respectively carries out digital-to-analog conversion on the first excitation noise signal, the second excitation noise signal, the third excitation noise signal and the fourth excitation noise signal to respectively obtain corresponding noise analog signals, the corresponding noise analog signals are sequentially input into the three-order digital correlator to be tested in sequence, the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested are tested, corresponding test results are obtained, and the performance test of the three-order digital correlator is completed.
Compared with the prior art, the invention has the beneficial effects that:
1. in the application, the automation of the whole link of the system is realized, the excitation signal simulation module and the data analysis module are realized by using the same console, the excitation noise can be generated to perform a test experiment, and the data analysis is performed on the experiment result, so that the test efficiency is improved.
2. The method of the invention realizes the simultaneous multi-channel test of the large-scale digital correlator to be tested by using the multi-channel DAC to play the excitation signal generated by simulation.
3. The analysis result of the actually measured data of the correlator is analyzed by depending on the data simulation result, so that the influence of non-ideal characteristics on the test result caused by the limited length of the test data is avoided. The data soft simulation is realized by means of third-order quantization logic which is the same as that of the correlator, so that the measurement error caused by the probability common non-ideal Gauss of the test data is avoided, and the test precision is improved.
4. Based on a Labview signal simulation algorithm, a plurality of paths of test signals with controllable correlation degrees and increasing linearity can be generated quantitatively and used repeatedly, so that the stability and the linearity of the system are tested, the influence of sensitivity on stability test is effectively avoided, and the performance evaluation of the digital correlator is more complete.
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Fig. 1 is a flow chart of a performance testing method for a third-order digital correlator according to the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
The invention provides a performance test system for a third-order digital correlator, which is arranged on a console and comprises: the device comprises a data parameter setting module, a data generating module and a data sending and processing module;
the data parameter setting module is used for simultaneously sending setting parameters of multiple paths of required excitation noise signals to the data generation module;
specifically, the setting parameters of the excitation noise signal include: correlation coefficient, power, integration time, sampling rate and bandwidth of the noise signal.
The data generation module is used for correspondingly generating a first excitation noise signal, a second excitation noise signal, a third excitation noise signal and a fourth excitation noise signal with arbitrary waveforms according to the setting parameters of the transmitted excitation noise signal;
specifically, the data generation module includes:
the first excitation signal generating unit is used for correspondingly generating a multipath uncorrelated white Gaussian noise band limiting signal with the bandwidth of 100M and the integration time length of 2.4s according to the setting parameters of the excitation noise signal sent by the data transmitting and processing terminal to obtain a plurality of groups of first excitation noise signals;
the second excitation signal generating unit is used for correspondingly generating a multi-channel white Gaussian noise band limiting signal with the bandwidth of 100M, the integration time length of which is 2.4s, the correlation coefficient of which is increased from 0 and is increased by taking 0.1 as a step, as a plurality of groups of second excitation noise signals according to the setting parameters of the excitation noise signals sent by the data transmitting and processing terminal;
a third excitation signal generating unit for correspondingly generating an integration time length of 2.4s and a correlation coefficient of (0: 10) according to the setting parameters of the excitation noise signal sent by the data transmitting and processing terminal-4：5×10-4) The multi-channel white Gaussian noise band-limited signals with the bandwidth of 100M are used as a plurality of groups of third excitation noise signals; each group of third excitation noise signals comprises two paths of white Gaussian noise band-limited signals; and
and the fourth excitation signal generating unit is used for correspondingly generating two groups of white gaussian noise band-limited signals CH1 signals and CH2 signals with analog correlation coefficients of 0.04+ j0.02 according to the setting parameters of the excitation noise signals sent by the data transmitting and processing terminal, and the two groups of white gaussian noise band-limited signals and the CH2 signals are used as fourth excitation noise signals.
The data sending and processing module is used for respectively carrying out digital-to-analog conversion on the first excitation noise signal, the second excitation noise signal, the third excitation noise signal and the fourth excitation noise signal to respectively obtain corresponding noise analog signals, and sequentially inputting the noise analog signals to the three-order digital correlator to be tested; and testing the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested to obtain corresponding test results, and completing the performance test of the three-order digital correlator.
Specifically, the data sending and processing module includes: the device comprises a first data sending and processing unit, a second data sending and processing unit, a third data sending and processing unit, a fourth data sending and processing unit and a fifth data sending and processing unit;
the first data sending and processing unit is used for simultaneously carrying out digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of first excitation noise signals to obtain multiple paths of first noise analog signals, inputting each path of first noise analog signals to the to-be-tested third-order digital correlator, and testing the correlation offset performance of the to-be-tested third-order digital correlator to obtain multiple first test results;
specifically, the specific process of the first data processing unit is as follows:
according to any group of first excitation noise signals, the correlation offset performance of the third-order digital correlator to be tested is tested and analyzed, and the specific process is as follows:
randomly selecting a group of first excitation noise signals, carrying out digital-to-analog conversion on two paths of uncorrelated white Gaussian noise band-limited signals in the group of first excitation noise signals to obtain two paths of first noise analog signals, and inputting the first noise analog signal of each path to two k and j channels of a three-order digital correlator to be tested; wherein, the two channels k and j are optional two channels;
calculating a first analog correlation coefficient for the set of first excitation noise signals:
Figure BDA0002999290480000141
wherein the content of the first and second substances,
Figure BDA0002999290480000142
the first analog correlation coefficient of k, j two channels of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskjThe cross correlation of two channels k, j of a three-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000143
wherein s isk(n) is a digital sequence of a first analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj(n) is a digital sequence of a first analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points: n is the length of the noise sequence;
Figure BDA0002999290480000144
Figure BDA0002999290480000145
Figure BDA0002999290480000146
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjIs to be treatedMeasuring a quantization threshold value of a j channel of a third-order digital correlator;
wherein the content of the first and second substances,
Figure BDA0002999290480000151
Figure BDA0002999290480000152
Figure BDA0002999290480000153
wherein phi is a probability distribution function of standard normal distribution;
Figure BDA0002999290480000154
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000155
Figure BDA0002999290480000156
Figure BDA0002999290480000157
wherein the content of the first and second substances,
Figure BDA0002999290480000158
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
true analog correlation calculated in a third order digital correlator from the set of first excitation noise signalsCoefficient of the first excitation noise signal to calculate the correlation offset u of the third order digital correlator to be measuredbias：
Figure BDA0002999290480000159
Wherein the content of the first and second substances,
Figure BDA00029992904800001510
calculating a real analog correlation coefficient obtained by the group of first excitation noise signals in a third-order digital correlator to be tested;
taking the correlation offset of the three-order digital correlator to be tested as a first test result;
and repeating the process, inputting each group of first excitation noise signals to the three-order digital correlator to be tested, and carrying out correlation offset test on the three-order digital correlator to be tested to obtain correlation offsets of the multiple three-order digital correlators to be tested, thereby obtaining multiple first test results.
In this embodiment, 8 paths of uncorrelated first analog signals are combined in any two-by-two manner and input into corresponding optional two channels, so that 26 correlated offsets can be obtained, and the precision of each correlated offset is 10-4, the correlation offset calculated by the method is more accurate and precise, and data support is provided for subsequent radiometer application.
The second data sending and processing unit is used for simultaneously carrying out digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of second excitation noise signals to obtain a plurality of paths of second noise analog signals, inputting each path of second noise analog signals to the to-be-tested third-order digital correlator, and testing the correlation efficiency performance of the to-be-tested third-order digital correlator to obtain a plurality of second test results;
specifically, according to any group of second excitation noise signals, the correlation efficiency performance of the third-order digital correlator to be tested is tested and analyzed, and the specific process is as follows:
randomly selecting a group of second excitation noise signals, carrying out digital-to-analog conversion on two paths of related white Gaussian noise band-limited signals in the group of second excitation noise signals to obtain multiple paths of second noise analog signals, and inputting the second analog signal of each path to two channels k and j of a three-order digital correlator to be detected; wherein, the two channels k and j are optional two channels;
calculating a second analog correlation coefficient for the set of second excitation noise signals:
Figure BDA0002999290480000161
wherein the content of the first and second substances,
Figure BDA0002999290480000162
the second analog correlation coefficient of two channels of k, j of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskj-1The first cross correlation of two k, j channels of a three-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000163
wherein s isk-1(n) is a digital sequence of a second analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj-1(n) is a digital sequence of a second analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points:
Figure BDA0002999290480000164
Figure BDA0002999290480000165
Figure BDA0002999290480000166
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjThe quantization threshold value of the j channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000171
Figure BDA0002999290480000172
Figure BDA0002999290480000173
wherein phi is a probability distribution function of standard normal distribution;
Figure BDA0002999290480000174
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000175
Figure BDA0002999290480000176
Figure BDA0002999290480000177
wherein the content of the first and second substances,
Figure BDA0002999290480000178
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
and further calculating the correlation efficiency eta of the to-be-tested third-order digital correlator of the group of second excitation noise signals by using the first test result:
Figure BDA0002999290480000179
wherein the content of the first and second substances,
Figure BDA00029992904800001710
performing three-order quantization data soft simulation on the second excitation noise signal which is a real analog correlation coefficient calculated in the to-be-detected three-order digital correlator for the group of second excitation noise signals, and obtaining an analog correlation coefficient of simulation calculation by using the same principle, wherein the analog correlation coefficient is not 0;
taking the correlation efficiency of the third-order digital correlator to be tested as a second test result;
repeating the process, inputting each group of second excitation noise signals to the three-order digital correlator to be tested, and testing the correlation efficiency of the three-order digital correlator to be tested to obtain the correlation efficiency of a plurality of three-order digital correlators to be tested, thereby obtaining a plurality of second test results;
the correlation efficiency obtained by the calculation is at least over 99.7 percent, so that the corresponding correlation efficiency error is within 0.3 percent, and the accuracy is greatly improved.
The third data sending and processing unit is used for simultaneously carrying out digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of third excitation noise signals to obtain multiple paths of third noise analog signals, inputting each path of third noise analog signals to the three-order digital correlator to be tested, and testing the linearity performance of the three-order digital correlator to be tested to obtain a third test result;
specifically, according to any group of third excitation noise signals, the linearity performance of the third-order digital correlator to be tested is tested and analyzed, and the specific process is as follows:
randomly selecting a group of third excitation noise signals, carrying out digital-to-analog conversion on two paths of related white Gaussian noise band-limited signals in the group of third excitation noise signals to obtain multiple paths of third noise analog signals, and inputting the third analog signal of each path to two channels k and j of a three-order digital correlator to be tested; wherein, the two channels k and j are optional two channels;
calculating a third analog correlation coefficient for the set of third excitation noise signals:
Figure BDA0002999290480000181
wherein the content of the first and second substances,
Figure BDA0002999290480000182
the third analog correlation coefficient of two channels of k, j of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskj-2The second cross correlation of two channels k, j of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000183
wherein s isk-2(n) is a digital sequence of a third analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj-2(n) is a digital sequence of a third analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points:
Figure BDA0002999290480000184
Figure BDA0002999290480000185
Figure BDA0002999290480000186
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjThe quantization threshold value of the j channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000191
Figure BDA0002999290480000192
Figure BDA0002999290480000193
wherein phi is a probability distribution function of standard normal distribution;
Figure BDA0002999290480000194
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000195
Figure BDA0002999290480000196
Figure BDA0002999290480000197
wherein the content of the first and second substances,
Figure BDA0002999290480000198
to be tested for threeThe variance of j channel of the digital correlator; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
repeating the above process, inputting each group of third excitation noise signals to the three-order digital correlator to be tested to obtain analog correlation coefficients of multiple three-order digital correlators to be tested, and inputting ubiasAs a standard value, screening and correcting analog correlation coefficients of a plurality of to-be-detected third-order digital correlators to obtain processed analog correlation coefficients; will be provided with
Figure BDA0002999290480000199
And the correlation degree between the processed simulation correlation coefficient is used as a third test result.
The linearity obtained by the above calculation is not less than 0.99.
The fourth data sending and processing unit is used for simultaneously carrying out digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of third excitation noise signals to obtain multiple paths of third noise analog signals, inputting each path of third noise analog signals to the three-order digital correlator to be tested, and testing the stability performance of the three-order digital correlator to be tested to obtain multiple fourth test results;
specifically, according to any group of third excitation noise signals, the linearity performance of the third-order digital correlator to be tested is tested and analyzed, and the specific process is as follows:
randomly selecting a group of third excitation noise signals, carrying out digital-to-analog conversion on two paths of related white Gaussian noise band-limited signals in the group of third excitation noise signals to obtain multiple paths of third noise analog signals, and inputting the third analog signal of each path to two channels k and j of a three-order digital correlator to be tested; wherein, the two channels k and j are optional two channels;
calculating a third analog correlation coefficient for the set of third excitation noise signals:
Figure BDA0002999290480000201
wherein the content of the first and second substances,
Figure BDA0002999290480000202
the third analog correlation coefficient of two channels of k, j of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskj-2The second cross correlation of two channels k, j of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000203
wherein s isk-2(n) is a digital sequence of a third analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj-2(n) is a digital sequence of a third analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points:
Figure BDA0002999290480000204
Figure BDA0002999290480000205
Figure BDA0002999290480000206
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjThe quantization threshold value of the j channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000207
Figure BDA0002999290480000208
Figure BDA0002999290480000211
wherein phi is a probability distribution function of standard normal distribution;
Figure BDA0002999290480000212
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure BDA0002999290480000213
Figure BDA0002999290480000214
Figure BDA0002999290480000215
wherein the content of the first and second substances,
Figure BDA0002999290480000216
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
repeating the process, inputting each group of third excitation noise signals to the to-be-detected third-order digital correlator to obtain analog correlation coefficients of the to-be-detected third-order digital correlators, and screening and correcting the analog correlation coefficients of the to-be-detected third-order digital correlators to obtain processed analog correlation coefficients; then, a rectangular coordinate system is established so as to
Figure BDA0002999290480000217
Abscissa, to processed analog correlation coefficientForming a point for the ordinate to obtain a plurality of points, and measuring the dispersion degree of the data distribution of the plurality of points by combining with the STD operation to obtain the stability, and using the stability as a fourth test result.
Through the calculation process, the standard deviation of the analog correlation coefficient, namely the stability, is less than or equal to 2.5E-5.
The fifth data sending and processing unit is used for simultaneously carrying out digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of fourth excitation noise signals to obtain multiple paths of fourth noise analog signals, inputting each path of fourth noise analog signals to the to-be-tested third-order digital correlator, and testing the related phase error performance of the to-be-tested third-order digital correlator to obtain a plurality of fifth test results;
specifically, a Labview arbitrary correlation signal generation algorithm is adopted, and a data generation module generates two quantitative (0-360 DEG) Gaussian white noise band-limited signals with phase offset theta as a CHi signal and a CHj signal;
respectively carrying out digital-to-analog conversion on the CHi signal and the CHj signal to obtain two paths of fourth noise analog signals, respectively carrying out digital-to-analog conversion on each path of fourth noise analog signal to obtain corresponding fourth analog signals, carrying out autocorrelation and cross-correlation operation processing, and carrying out analog-to-digital conversion to obtain ii(n)、qi(n)、ij(n) and qj(n) four digital signals:
calculating the phase of the CHi signal and the CHj signal
Figure BDA0002999290480000221
Figure BDA0002999290480000222
Wherein M isijPerforming soft simulation calculation on a CHi signal and a CHj signal of a third-order digital correlator to be detected to obtain a real complex simulation correlation coefficient;
Figure BDA0002999290480000223
the real part of a real complex simulation correlation coefficient is obtained by soft simulation calculation of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure BDA0002999290480000224
performing soft simulation calculation on a third-order digital correlator CHi signal to be detected and a CHj signal to obtain an imaginary part of a real complex simulation correlation coefficient;
Figure BDA0002999290480000225
Figure BDA0002999290480000226
Figure BDA0002999290480000227
Figure BDA0002999290480000228
Figure BDA0002999290480000229
Figure BDA00029992904800002210
wherein the content of the first and second substances,
Figure BDA00029992904800002211
analog correlation coefficients of an I path and an I path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure BDA00029992904800002212
to-be-tested third-order digital correlatorAnalog correlation coefficients of a Q path and a Q path of two groups of fourth excitation noise signals of the CHi signal and the CHj signal;
Figure BDA00029992904800002213
analog correlation coefficients of an I path and a Q path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure BDA00029992904800002214
analog correlation coefficients between a Q path and an I path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected; i.e. ii(n) is a digital signal in the CHi signal; q. q.si(n) is another digital signal in the CHi signal; i.e. ij(n) is a digital signal in the CHj signal; q. q.sj(n) is another digital signal in the CHj signal;
calculating the measured phases of the CH1 signal and the CH2 signal
Figure BDA0002999290480000231
Figure BDA0002999290480000232
Wherein M is1 ijActually measured complex analog correlation coefficients of two groups of fourth excitation noise signals of a CHi signal and a CHj signal of a third-order digital correlator to be detected;
Figure BDA0002999290480000233
real parts of actually measured complex analog correlation coefficients of two groups of fourth excitation noise signals of a CHi signal and a CHj signal of a third-order digital correlator to be measured;
Figure BDA0002999290480000234
the imaginary parts of actually measured complex analog correlation coefficients of two groups of fourth excitation noise signals of a CHi signal and a CHj signal of a third-order digital correlator to be detected;
and further determining the correlation phase error of the third-order digital correlator to be detected:
Figure BDA0002999290480000235
and taking the correlation phase error of the third-order digital correlator to be tested as a fifth test result.
The phase error obtained by the above calculation is <0.13 °.
Wherein the test system further comprises: and the evaluation analysis module is used for evaluating and analyzing the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested respectively according to the obtained test result.
Specifically, according to the existing test standard for the performance test of the correlation offset, the precision of each correlation offset in the obtained first test result is 10-4If the correlation offset performance of the third-order digital correlator to be tested exceeds the test standard, evaluating the correlation offset performance of the third-order digital correlator to be tested to be optimal;
according to the existing test standard for testing the performance of the correlation efficiency, each correlation efficiency in the obtained second test result is more than 99.7%, the error of the correlation efficiency is within 0.3%, and the correlation efficiency performance of the three-order digital correlator to be tested is evaluated to be optimal when the correlation efficiency performance exceeds the test standard;
according to the existing test standard for the linearity performance test, the correlation between each analog correlation coefficient in the obtained third test result and the analog correlation coefficient of the soft simulation is above 0.99, and the linearity performance of the third-order digital correlator to be tested is evaluated to be optimal when the correlation exceeds the test standard;
according to the existing test standard for testing the correlation offset performance, each stability in the obtained fourth test result is utilized, and the stability performance of the three-order digital correlator to be tested is evaluated to be optimal when the stability exceeds the test standard;
and according to the existing test standard for testing the performance of the correlation phase error, the phase error in the obtained fifth test result is within 0.13 degrees, and the performance of the correlation phase error of the third-order digital correlator to be tested is evaluated to be optimal when the phase error exceeds the test standard.
The invention also provides a performance test method for the third-order digital correlator, which comprises the following steps:
the data parameter setting module simultaneously sends setting parameters of multiple paths of required excitation noise signals to the data generation module;
the data generation module correspondingly generates a first excitation noise signal, a second excitation noise signal, a third excitation noise signal and a fourth excitation noise signal with arbitrary waveforms according to the setting parameters of the transmitted excitation noise signal;
and the data sending and processing module respectively carries out digital-to-analog conversion on the first excitation noise signal, the second excitation noise signal, the third excitation noise signal and the fourth excitation noise signal to respectively obtain corresponding noise analog signals, the corresponding noise analog signals are sequentially input into the three-order digital correlator to be tested in sequence, the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested are tested, corresponding test results are obtained, and the performance test of the three-order digital correlator is completed.
The method further comprises the following steps: and the evaluation analysis module evaluates and analyzes the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested respectively according to the obtained test result.
The system provided by the invention is based on a Labview signal simulation algorithm, can quantitatively generate a plurality of paths of test signals with controllable correlation degrees and increasing linearity, and can be repeatedly used, so that the stability and the linearity of the system are tested, and the influence of sensitivity on stability test is effectively avoided.
The method of the invention can avoid the influence of the error of the devices such as an additional amplifier, a power divider and the like on the test result, not only reduces the complexity of the test system, but also can correct the influence of the non-ideal characteristics of the data on the test result, thereby improving the test precision.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A performance testing system for a third order digital correlator, the testing system being disposed on a console, comprising: the device comprises a data parameter setting module, a data generating module and a data sending and processing module;
the data parameter setting module is used for simultaneously sending setting parameters of multiple paths of required excitation noise signals to the data generation module;
the data generation module is used for correspondingly generating a first excitation noise signal, a second excitation noise signal, a third excitation noise signal and a fourth excitation noise signal with arbitrary waveforms according to the setting parameters of the transmitted excitation noise signal;
the data sending and processing module is used for respectively carrying out digital-to-analog conversion on the first excitation noise signal, the second excitation noise signal, the third excitation noise signal and the fourth excitation noise signal to respectively obtain corresponding noise analog signals, and sequentially inputting the noise analog signals to the three-order digital correlator to be tested; and testing the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested to obtain corresponding test results, and completing the performance test of the three-order digital correlator.
2. The performance testing system for a third order digital correlator, according to claim 1, wherein said testing system further comprises: and the evaluation analysis module is used for evaluating and analyzing the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested respectively according to the obtained test result.
3. The system for performance testing of a third order digital correlator according to claim 1 wherein said data generation module comprises:
the first excitation signal generating unit is used for correspondingly generating a multipath uncorrelated white Gaussian noise band limiting signal with the bandwidth of 100M and the integration time length of 2.4s according to the setting parameters of the excitation noise signal sent by the data transmitting and processing terminal to obtain a plurality of groups of first excitation noise signals;
the second excitation signal generating unit is used for correspondingly generating a multi-channel white Gaussian noise band limiting signal with the bandwidth of 100M, the integration time length of which is 2.4s, the correlation coefficient of which is increased from 0 and is increased by taking 0.1 as a step, as a plurality of groups of second excitation noise signals according to the setting parameters of the excitation noise signals sent by the data transmitting and processing terminal;
a third excitation signal generating unit for correspondingly generating an integration time length of 2.4s and a correlation coefficient of (0: 10) according to the setting parameters of the excitation noise signal sent by the data transmitting and processing terminal-4∶5×10-4) The multi-channel white Gaussian noise band-limited signals with the bandwidth of 100M are used as a plurality of groups of third excitation noise signals; and
and the fourth excitation signal generating unit is used for correspondingly generating two groups of white gaussian noise band-limited signals CHi signals and CHj signals with analog correlation coefficients of 0.04+ j0.02 according to the setting parameters of the excitation noise signals sent by the data transmitting and processing terminal, and the two groups of white gaussian noise band-limited signals CHi signals and CHj signals are used as fourth excitation noise signals.
4. The system for performance testing of a third order digital correlator as in claim 3 wherein said data transmission module comprises:
the first data sending and processing unit is used for carrying out digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of first excitation noise signals to obtain multiple paths of first noise analog signals, inputting each path of first noise analog signals to the three-order digital correlator to be tested, and testing the correlation offset performance of the three-order digital correlator to be tested to obtain a plurality of first test results;
the second data sending and processing unit is used for carrying out digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of second excitation noise signals to obtain a plurality of paths of second noise analog signals, and inputting each path of second analog signals to the three-order digital correlator to be tested; testing the correlation efficiency performance of the three-order digital correlator to be tested to obtain a plurality of second test results;
the third data sending and processing unit is used for performing digital-to-analog conversion on each path of Gaussian white noise band-limited signals in each group of third excitation noise signals to obtain multiple paths of third noise analog signals, and inputting each path of third analog signals to the three-order digital correlator to be tested; testing the linearity performance of the three-order digital correlator to be tested to obtain a third test result;
the fourth data sending and processing unit is used for performing digital-to-analog conversion on each path of Gaussian white noise band-limited signals in the third excitation noise signals to obtain multiple paths of third noise analog signals, and inputting each path of third noise analog signals to the third-order digital correlator to be tested; testing the stability performance of the three-order digital correlator to be tested to obtain a fourth test result; and
the fifth data sending and processing unit is used for performing digital-to-analog conversion on each path of Gaussian white noise band-limited signals in the fourth excitation noise signals to obtain multiple paths of fourth noise analog signals, and inputting each path of fourth noise analog signals to the third-order digital correlator to be tested; and testing the related phase error performance of the third-order digital correlator to be tested to obtain a fifth test result.
5. The system for testing the performance of a third-order digital correlator as in claim 4, wherein the first data sending and processing unit is further configured to:
randomly selecting a group of first excitation noise signals, carrying out digital-to-analog conversion on two paths of uncorrelated white Gaussian noise band-limited signals in the group of first excitation noise signals to obtain two paths of first noise analog signals, and inputting the first noise analog signal of each path to two k and j channels of a three-order digital correlator to be tested; wherein, the two channels k and j are optional two channels;
calculating a first analog correlation coefficient for the set of first excitation noise signals:
Figure FDA0002999290470000031
wherein the content of the first and second substances,
Figure FDA0002999290470000032
the first analog correlation coefficient of k, j two channels of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskjThe cross correlation of two channels k, j of a three-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA0002999290470000033
wherein s isk(n) is a digital sequence of a first analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj(n) is a digital sequence of a first analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points:
Figure FDA0002999290470000034
Figure FDA0002999290470000035
Figure FDA0002999290470000036
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjIs the j-channel of the third-order digital correlator to be testedA quantization threshold of the tracks;
wherein the content of the first and second substances,
Figure FDA0002999290470000037
Figure FDA0002999290470000038
Figure FDA0002999290470000039
wherein phi is a probability distribution function of standard normal distribution;
Figure FDA00029992904700000310
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA00029992904700000311
Figure FDA0002999290470000041
Figure FDA0002999290470000042
wherein the content of the first and second substances,
Figure FDA0002999290470000043
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
according toCalculating the real analog correlation coefficient of the group of first excitation noise signals in the third-order digital correlator, and calculating the correlation offset u of the third-order digital correlator to be tested of the group of first excitation noise signalsbias：
Figure FDA0002999290470000044
Wherein the content of the first and second substances,
Figure FDA0002999290470000045
performing soft simulation calculation on the third-order quantized data of the group of first excitation noise signals in a third-order digital correlator to be tested to obtain a real analog correlation coefficient;
the correlation offset u of the third-order digital correlator to be testedbiasAs a first test result;
and repeating the process, inputting each group of first excitation noise signals to the three-order digital correlator to be tested, and carrying out correlation offset test on the three-order digital correlator to be tested to obtain correlation offsets of the multiple three-order digital correlators to be tested, thereby obtaining multiple first test results.
6. The system for testing the performance of a third-order digital correlator as in claim 4, wherein the second data sending and processing unit is further configured to:
randomly selecting a group of second excitation noise signals, carrying out digital-to-analog conversion on two paths of related white Gaussian noise band-limited signals in the group of second excitation noise signals to obtain multiple paths of second noise analog signals, and inputting the second analog signal of each path to two channels k and j of a three-order digital correlator to be detected; wherein, the two channels k and j are optional two channels;
calculating a second analog correlation coefficient for the set of second excitation noise signals:
Figure FDA0002999290470000046
wherein the content of the first and second substances,
Figure FDA0002999290470000047
the second analog correlation coefficient of two channels of k, j of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskj-1The first cross correlation of two k, j channels of a three-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA0002999290470000051
wherein s isk-1(n) is a digital sequence of a second analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj-1(n) is a digital sequence of a second analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points:
Figure FDA0002999290470000052
Figure FDA0002999290470000053
Figure FDA0002999290470000054
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjThe quantization threshold value of the j channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA0002999290470000055
Figure FDA0002999290470000056
Figure FDA0002999290470000057
wherein phi is a probability distribution function of standard normal distribution;
Figure FDA0002999290470000058
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA0002999290470000059
Figure FDA00029992904700000510
Figure FDA00029992904700000511
wherein the content of the first and second substances,
Figure FDA00029992904700000512
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
using the first test result ubiasAnd further calculating the correlation efficiency eta of the third-order digital correlator to be tested of the group of second excitation noise signals:
Figure FDA0002999290470000061
taking the correlation efficiency eta of the three-order digital correlator to be tested as a second test result;
and repeating the process, inputting each group of second excitation noise signals to the three-order digital correlator to be tested, and testing the correlation efficiency of the three-order digital correlator to be tested to obtain the correlation efficiency of the multiple three-order digital correlators to be tested, thereby obtaining multiple second test results.
7. The system for testing the performance of a third-order digital correlator, according to claim 4, wherein the third data sending and processing unit is configured to perform the following steps:
randomly selecting a group of third excitation noise signals, carrying out digital-to-analog conversion on two paths of related white Gaussian noise band-limited signals in the group of third excitation noise signals to obtain multiple paths of third noise analog signals, and inputting the third analog signal of each path to two channels k and j of a three-order digital correlator to be tested; wherein, the two channels k and j are optional two channels;
calculating a third analog correlation coefficient for the set of third excitation noise signals:
Figure FDA0002999290470000062
wherein the content of the first and second substances,
Figure FDA0002999290470000063
the third analog correlation coefficient of two channels of k, j of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskj-2The second cross correlation of two channels k, j of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA0002999290470000064
wherein s isk-2(n) is a digital sequence of a third analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj-2(n) is a digital sequence of a third analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points: n is the length of the noise sequence;
Figure FDA0002999290470000065
Figure FDA0002999290470000066
Figure FDA0002999290470000071
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjThe quantization threshold value of the j channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA0002999290470000072
Figure FDA0002999290470000073
Figure FDA0002999290470000074
wherein phi is a probability distribution function of standard normal distribution;
Figure FDA0002999290470000075
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA0002999290470000076
Figure FDA0002999290470000077
Figure FDA0002999290470000078
wherein the content of the first and second substances,
Figure FDA0002999290470000079
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
repeating the above process, inputting each group of third excitation noise signals to the three-order digital correlator to be tested to obtain analog correlation coefficients of multiple three-order digital correlators to be tested, and inputting ubiasAs a standard value, screening and correcting analog correlation coefficients of a plurality of to-be-detected third-order digital correlators to obtain processed analog correlation coefficients; will be provided with
Figure FDA00029992904700000710
And the correlation degree between the processed simulation correlation coefficient is used as a third test result.
8. The system for testing the performance of a third-order digital correlator as claimed in claim 4, wherein the fourth data transmitting and processing unit is configured to perform the following steps:
randomly selecting a group of third excitation noise signals, carrying out digital-to-analog conversion on two paths of related white Gaussian noise band-limited signals in the group of third excitation noise signals to obtain multiple paths of third noise analog signals, and inputting the third analog signal of each path to two channels k and j of a three-order digital correlator to be tested; wherein, the two channels k and j are optional two channels;
calculating a third analog correlation coefficient for the set of third excitation noise signals:
Figure FDA0002999290470000081
wherein the content of the first and second substances,
Figure FDA0002999290470000082
the third analog correlation coefficient of two channels of k, j of the third-order digital correlator to be detected; c. C1Is a first conversion coefficient; c. C3Is a second conversion coefficient; c. C5Is a third conversion coefficient; r iskj-2The second cross correlation of two channels k, j of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA0002999290470000083
wherein s isk-2(n) is a digital sequence of a third analog signal of a k channel of the third-order digital correlator to be detected after third-order quantization; sj-2(n) is a digital sequence of a third analog signal of a j channel of the third-order digital correlator to be detected after third-order quantization; n is the number of integration points:
Figure FDA0002999290470000084
Figure FDA0002999290470000085
Figure FDA0002999290470000086
wherein k iskThe quantization threshold value of the k channel of the third-order digital correlator to be detected; k is a radical ofjThe quantization threshold value of the j channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA0002999290470000087
Figure FDA0002999290470000088
Figure FDA0002999290470000089
wherein phi is a probability distribution function of standard normal distribution;
Figure FDA00029992904700000810
the variance of a k channel of a three-order digital correlator to be detected; skThe autocorrelation of the k channel of the third-order digital correlator to be detected;
wherein the content of the first and second substances,
Figure FDA0002999290470000091
Figure FDA0002999290470000092
Figure FDA0002999290470000093
wherein the content of the first and second substances,
Figure FDA0002999290470000094
the variance of a j channel of a three-order digital correlator to be detected; sjThe autocorrelation of the j channel of the third-order digital correlator to be detected;
repeating the process, inputting each group of third excitation noise signals to the to-be-detected third-order digital correlator to obtain analog correlation coefficients of the to-be-detected third-order digital correlators, and screening and correcting the analog correlation coefficients of the to-be-detected third-order digital correlators to obtain processed analog correlation coefficients; then, a rectangular coordinate system is established so as to
Figure FDA0002999290470000095
And forming a point by using the processed simulation correlation coefficient as a vertical coordinate on the horizontal coordinate to obtain a plurality of points, measuring the dispersion degree of data distribution of the plurality of points by combining with STD operation to obtain stability, and using the stability as a fourth test result.
9. The system for testing the performance of a third-order digital correlator as claimed in claim 4 wherein said fifth data transmitting and processing unit is further configured to:
adopting a Labview arbitrary correlation signal generation algorithm, and generating two quantitative (0-360 DEG) Gaussian white noise band-limited signals with phase offset theta by a data generation module to serve as a CHi signal and a CHj signal;
respectively carrying out digital-to-analog conversion on the CHi signal and the CHj signal to obtain two paths of fourth noise analog signals, respectively carrying out digital-to-analog conversion on each path of fourth noise analog signal to obtain corresponding fourth analog signals, carrying out autocorrelation and cross-correlation operation processing, and carrying out analog-to-digital conversion to obtain ii(n)、qi(n)、ij(n) and qj(n) four digital signals:
calculating the phase of the CHi signal and the CHj signal
Figure FDA0002999290470000096
Figure FDA0002999290470000097
Wherein M isijPerforming soft simulation calculation on a CHi signal and a CHj signal of a third-order digital correlator to be detected to obtain a real complex simulation correlation coefficient;
Figure FDA0002999290470000098
the real part of a real complex simulation correlation coefficient is obtained by soft simulation calculation of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure FDA0002999290470000101
performing soft simulation calculation on a third-order digital correlator CHi signal to be detected and a CHj signal to obtain an imaginary part of a real complex simulation correlation coefficient;
Figure FDA0002999290470000102
Figure FDA0002999290470000103
Figure FDA0002999290470000104
Figure FDA0002999290470000105
Figure FDA0002999290470000106
Figure FDA0002999290470000107
wherein the content of the first and second substances,
Figure FDA0002999290470000108
analog correlation coefficients of an I path and an I path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure FDA0002999290470000109
analog correlation coefficients of a Q path and a Q path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure FDA00029992904700001010
analog correlation coefficients of an I path and a Q path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected;
Figure FDA00029992904700001011
analog correlation coefficients between a Q path and an I path of two groups of fourth excitation noise signals of a three-order digital correlator CHi signal and a CHj signal to be detected; i.e. ii(n) is a digital signal in the CHi signal; q. q.si(n) is another digital signal in the CHi signal; i.e. ij(n) is a digital signal in the CHj signal; q. q.sj(n) is another digital signal in the CHj signal;
calculating the measured phases of the CH1 signal and the CH2 signal
Figure FDA00029992904700001012
Figure FDA00029992904700001013
Wherein the content of the first and second substances,
Figure FDA00029992904700001014
wherein M is1 ijActually measured complex analog correlation coefficients of two groups of fourth excitation noise signals of a CHi signal and a CHj signal of a third-order digital correlator to be detected;
Figure FDA0002999290470000111
real parts of actually measured complex analog correlation coefficients of two groups of fourth excitation noise signals of a CHi signal and a CHj signal of a third-order digital correlator to be measured;
Figure FDA0002999290470000112
the imaginary parts of actually measured complex analog correlation coefficients of two groups of fourth excitation noise signals of a CHi signal and a CHj signal of a third-order digital correlator to be detected;
and further determining the correlation phase error of the third-order digital correlator to be detected:
Figure FDA0002999290470000113
and taking the correlation phase error of the third-order digital correlator to be tested as a fifth test result.
10. A performance testing method for a third-order digital correlator, the method being implemented based on the performance testing system for a third-order digital correlator as claimed in any one of claims 1 to 9, the method comprising:
the data parameter setting module simultaneously sends setting parameters of multiple paths of required excitation noise signals to the data generation module;
the data generation module correspondingly generates a first excitation noise signal, a second excitation noise signal, a third excitation noise signal and a fourth excitation noise signal with arbitrary waveforms according to the setting parameters of the transmitted excitation noise signal;
and the data sending and processing module respectively carries out digital-to-analog conversion on the first excitation noise signal, the second excitation noise signal, the third excitation noise signal and the fourth excitation noise signal to respectively obtain corresponding noise analog signals, the corresponding noise analog signals are sequentially input into the three-order digital correlator to be tested in sequence, the correlation offset performance, the correlation efficiency performance, the stability performance, the linearity performance and the phase error performance of the three-order digital correlator to be tested are tested, corresponding test results are obtained, and the performance test of the three-order digital correlator is completed.
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