CN106093624B - A kind of multi-channel digital correlator performance test methods - Google Patents
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Abstract
一种多通道数字相关器性能测试方法，首先产生两路非相关噪声信号，并分别进行功分处理，将功分得到的两路功分信号进行移相得到两路噪声信号，其余两路进行衰减、合路后得到第三路噪声信号，调节衰减量、移相值直至三路噪声信号满足要求，然后将三路噪声信号进行功分处理得到多路待测试源通道并送至待测试数字相关器，得到实测复相关值，同时计算得到预期复相关值，最后根据实测复相关值、预期复相关值得到待测试数字相关器精度并完成当待测试数字相关器精度测试。本发明方法通过使用切换控制矩阵器实现了待测试数字相关器多路通道同时测试，解决了现有技术中人为操作过多及长时间性能漂移引入误差的问题，具有较好的适用价值。
A method for testing the performance of a multi-channel digital correlator. Firstly, two non-correlated noise signals are generated, and power division processing is performed on them respectively. The two power division signals obtained by power division are phase-shifted to obtain two noise signals, and the other two are processed. After attenuation and combination, the third noise signal is obtained. Adjust the attenuation and phase shift value until the three noise signals meet the requirements, and then perform power division processing on the three noise signals to obtain multiple source channels to be tested and send them to the digital channel to be tested. The correlator obtains the measured complex correlation value, and calculates the expected complex correlation value at the same time, and finally obtains the accuracy of the digital correlator to be tested according to the measured complex correlation value and the expected complex correlation value, and completes the accuracy test of the digital correlator to be tested. The method of the invention realizes the simultaneous testing of multiple channels of the digital correlator to be tested by using a switching control matrix, solves the problems of too many human operations and long-term performance drift introducing errors in the prior art, and has good applicable value.
Description
技术领域technical field
本发明涉及空间微波遥感技术领域，特别是一种多通道数字相关器性能测试方法。The invention relates to the technical field of space microwave remote sensing, in particular to a method for testing the performance of a multi-channel digital correlator.
背景技术Background technique
综合孔径微波辐射计系统中最为关键的部件就是多通道数字相关器，其核心功能为实现任意两个通道之间的复相关运算，多通道数字相关器复相关结果精度直接决定综合孔径微波辐射计系统测量结果的准确性和精确性，进而影响辐射计系统关键性能指标，因此需要一种多通道数字相关器性能测试方法。The most critical component in the synthetic aperture microwave radiometer system is the multi-channel digital correlator. Its core function is to realize the complex correlation operation between any two channels. The accuracy of the complex correlation result of the multi-channel digital correlator directly determines the The accuracy and precision of the system measurement results will affect the key performance indicators of the radiometer system, so a multi-channel digital correlator performance test method is needed.
现有的多通道数字相关器测试方法主要是基于两路信号的复相关值测试，该方法通过更换不同测试通道实现多通道测试。但是随着测试通道数的增加，上述测试方法会导致测试过程繁杂、工作量大，另外由于人为多次更换连接关系可能会导致误差增大，而且长时间测试引入的测试结果漂移同样会使得测试误差增大。The existing multi-channel digital correlator test method is mainly based on the complex correlation value test of two signals, and this method realizes multi-channel test by changing different test channels. However, with the increase of the number of test channels, the above test method will lead to a complicated test process and heavy workload. In addition, the error may increase due to artificially changing the connection relationship many times, and the test result drift introduced by the long-term test will also make the test The error increases.
发明内容Contents of the invention
本发明解决的技术问题是：克服现有技术的不足，提供了一种通过使用切换控制矩阵器实现了待测试数字相关器多路通道同时测试，解决了现有技术中人为操作过多及长时间性能漂移引入误差的问题的多通道数字相关器性能测试方法。The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, and to provide a simultaneous test of multiple channels of the digital correlator to be tested by using a switching control matrix, which solves the problem of excessive manual operations and long-term testing in the prior art. A multi-channel digital correlator performance test method for the problem of error introduced by time performance drift.
本发明的技术解决方案是：一种多通道数字相关器性能测试方法，包括如下步骤：The technical solution of the present invention is: a kind of multi-channel digital correlator performance test method, comprises the following steps:
(1)产生两路非相关的噪声信号，并分别记为第一噪声信号、第二噪声信号，然后将第一噪声信号进行功分处理后得到功分a信号、功分b信号，将第二噪声信号进行功分处理得到功分c信号和功分d信号；(1) Generate two non-correlated noise signals, and record them as the first noise signal and the second noise signal respectively, and then perform power division processing on the first noise signal to obtain the power division a signal and power division b signal, and the second noise signal The second noise signal is subjected to power division processing to obtain a power division c signal and a power division d signal;
(2)将功分a信号送至第一移相器进行移相处理后得到待测噪声A信号，将功分c信号送至第二移相器进行移相处理后得到待测噪声C信号，其中，第一移相器的移相值为θ1，第二移相器的移相值为θ2，θ1≠θ2，θ1、θ2>0；(2) Send the power division a signal to the first phase shifter for phase shift processing to obtain the noise A signal to be measured, and send the power division c signal to the second phase shifter for phase shift processing to obtain the noise C signal to be measured , where the phase shift value of the first phase shifter is θ 1 , the phase shift value of the second phase shifter is θ 2 , θ 1 ≠ θ 2 , θ 1 , θ 2 >0;
(3)将功分b信号送至第一可调衰减器进行衰减处理得到P1信号，将功分d信号送至第二可调衰减器进行衰减处理后得到P2信号，将P1和P2信号进行合路处理后得到待测噪声B信号，其中，第一可调衰减器的衰减量与第二可调衰减器的衰减量均大于0且不相同，P1信号的功率为P1，P2信号的功率为P2；(3) Send the power division b signal to the first adjustable attenuator for attenuation processing to obtain the P1 signal, send the power division d signal to the second adjustable attenuator for attenuation processing to obtain the P2 signal, and perform P1 and P2 signals After combined processing, the noise B signal to be measured is obtained, wherein the attenuation of the first adjustable attenuator and the attenuation of the second adjustable attenuator are both greater than 0 and different, the power of the P1 signal is P 1 , and the power of the P2 signal The power is P2 ;
(4)调节第一可调衰减器的衰减量与第二可调衰减器的衰减量直至待测噪声A、待测噪声B、待测噪声C的信号功率均为P，其中，P＝P1+P2；(4) Adjust the attenuation of the first adjustable attenuator and the attenuation of the second adjustable attenuator until the signal powers of the noise A to be measured, the noise B to be measured, and the noise C to be measured are all P, where P=P 1 + P 2 ;
(5)将待测噪声A信号、待测噪声B信号、待测噪声C信号分别进行功分处理，得到多路待测试源通道并分别送至待测试数字相关器，得到实测的待测试数字相关器各通道间的复相关值；所述的待测试源通道为待测噪声A信号、待测噪声B信号或者待测噪声C信号功分处理得到的测试信号；(5) The noise A signal to be tested, the noise B signal to be tested, and the noise C signal to be tested are subjected to power division processing to obtain multiple source channels to be tested and sent to the digital correlator to be tested respectively to obtain the actual measured digital signal to be tested. The complex correlation value between each channel of the correlator; The described source channel to be tested is the test signal obtained by power division processing of the noise A signal to be measured, the noise B signal to be measured or the noise C signal to be measured;
(6)计算预期的待测试数字相关器各通道间的复相关值为：(6) Calculate the expected complex correlation value between each channel of the digital correlator to be tested:
如果两个待测试源通道分别为待测噪声A信号功分信号、待测噪声B信号功分信号，则预期的复相关值幅度值|ρAB|为If the two source channels to be tested are the power divided signal of the noise A signal to be tested and the power divided signal of the noise B signal to be tested, then the expected complex correlation value amplitude | ρAB | is
预期的复相关值相位为θ1；The expected complex correlation value phase is θ 1 ;
如果两个待测试源通道分别为待测噪声B信号功分信号、待测噪声C信号功分信号，则预期的复相关值幅度值|ρBC|为If the two source channels to be tested are respectively the power divided signal of the noise B signal to be tested and the power divided signal of the noise C signal to be tested, then the expected amplitude value of the complex correlation value |ρ BC | is
预期的复相关值相位为θ2；The expected complex correlation value phase is θ 2 ;
如果两个待测试源通道分别为待测噪声A信号功分信号、待测噪声C信号功分信号，则预期的复相关值幅度值|ρAC|＝0，预期的复相关值相位为0；遍历待测试数字相关器各通道，得到预期的待测试数字相关器各通道间的复相关值；If the two source channels to be tested are the power divided signal of the noise A signal to be tested and the power divided signal of the noise C signal to be tested, then the expected complex correlation value amplitude |ρ AC |=0, and the expected complex correlation value phase is 0 ; Traverse the channels of the digital correlator to be tested to obtain the expected complex correlation value between the channels of the digital correlator to be tested;
(7)根据实测的待测试数字相关器各通道间的复相关值、预期的待测试数字相关器各通道间的复相关值计算得到待测试数字相关器各通道间的精度；(7) calculate the precision between each channel of the digital correlator to be tested according to the complex correlation value between each channel of the digital correlator to be tested and the complex correlation value between each channel of the expected digital correlator to be tested;
(8)当待测试数字相关器俩通道精度的相位不小于1，俩通道精度的幅度值不大于0.99时，待测试数字相关器的当前俩通道可用，否则待测试数字相关器的当前俩通道不可用。(8) When the phase of the accuracy of the two channels of the digital correlator to be tested is not less than 1, and the amplitude value of the accuracy of the two channels is not greater than 0.99, the current two channels of the digital correlator to be tested are available, otherwise the current two channels of the digital correlator to be tested unavailable.
所述的根据实测的待测试数字相关器各通道间的复相关值、预期的待测试数字相关器各通道间的复相关值计算得到待测试数字相关器各通道间的精度的方法包括如下步骤：The method for calculating the accuracy between the channels of the digital correlator to be tested according to the measured complex correlation value between the channels of the digital correlator to be tested and the expected complex correlation value between the channels of the digital correlator to be tested comprises the following steps :
(1)任意选取两个通道，计算实测的当前两个通道的复相关值、预期的当前两个通道的复相关值的差值，进而得到当前两个通道的精度；(1) Select two channels arbitrarily, calculate the measured complex correlation value of the current two channels, and the difference between the expected complex correlation values of the current two channels, and then obtain the accuracy of the current two channels;
(2)遍历待测试数字相关器中的所有通道，得到任意两个通道的精度。(2) Go through all the channels in the digital correlator to be tested to obtain the accuracy of any two channels.
所述的步骤(1)中的噪声信号的带宽是有限的。The bandwidth of the noise signal in the step (1) is limited.
所述的将待测噪声A信号、待测噪声B信号、待测噪声C信号分别进行功分处理，得到多路待测试源通道并分别送至待测试数字相关器的方法包括如下步骤：The method of performing power division processing on the noise A signal to be tested, the noise B signal to be measured, and the noise C signal to be tested to obtain multiple source channels to be tested and send them to the digital correlator to be tested respectively includes the following steps:
(1)将待测噪声A信号、待测噪声B信号、待测噪声C信号送至开关矩阵；(1) Send the noise A signal to be measured, the noise B signal to be measured, and the noise C signal to be measured to the switch matrix;
(2)控制开关矩阵中开关的闭合使得将待测噪声A信号、待测噪声B信号、待测噪声C信号能够分别送至第四功分器、第五功分器、第六功分器，其中，第四功分器、第五功分器、第六功分器连接的待测试数字相关器通道各不相同；(2) Control the closing of the switches in the switch matrix so that the noise A signal to be measured, the noise B signal to be measured, and the noise C signal to be measured can be sent to the fourth power divider, the fifth power divider, and the sixth power divider respectively , wherein the digital correlator channels to be tested connected to the fourth power divider, the fifth power divider, and the sixth power divider are different;
(3)控制第四功分器、第五功分器、第六功分器对输入的待测噪声A信号、待测噪声B信号或者待测噪声C信号进行功分处理，得到多路待测试源通道并分别送至连接的待测试数字相关器通道。(3) Control the fourth power divider, the fifth power divider, and the sixth power divider to perform power division processing on the input noise A signal to be measured, the noise B signal to be measured, or the noise C signal to be measured to obtain multiple channels to be The test source channel is sent to the connected digital correlator channel to be tested respectively.
所述的第四功分器、第五功分器、第六功分器均为一分十六，待测试数字相关器为48路通道。The fourth power divider, the fifth power divider, and the sixth power divider are all divided into 16, and the digital correlator to be tested has 48 channels.
所述的开关矩阵包括六种连通方式。The switch matrix includes six connection modes.
本发明与现有技术相比的优点在于：The advantage of the present invention compared with prior art is:
(1)本发明方法与现有技术相比，通过使用切换控制矩阵器实现了待测试数字相关器多路通道同时测试，解决了现有的多通道数字相关器性能测试技术中人为操作过多及长时间性能漂移引入误差的问题；(1) Compared with the prior art, the method of the present invention realizes the simultaneous testing of multiple channels of the digital correlator to be tested by using the switching control matrix device, and solves too many artificial operations in the existing multi-channel digital correlator performance testing technology And the problem of long-term performance drift introducing errors;
(2)本发明方法与现有技术相比，通过调节衰减器和移相器实现了多通道数字相关器复相关值幅度和相位的遍历，解决了现有的多通道数字相关器性能测试技术复相关值测试覆盖不全的问题；(2) Compared with the prior art, the inventive method realizes the traversal of the multi-channel digital correlator complex correlation value amplitude and phase by adjusting the attenuator and the phase shifter, and solves the existing multi-channel digital correlator performance testing technology The problem of incomplete coverage of complex correlation value tests;
(3)本发明与现有技术相比，核心处理过程只需通过设置开关矩阵、调节衰减器及移相器便可实现，实现简单、工程量小，解决了多通道数字相关器性能测试过程繁杂的问题，更有利于数字相关器精度的提高。(3) Compared with the prior art, the present invention only needs to realize the core processing process by setting the switch matrix, adjusting the attenuator and the phase shifter, the realization is simple, the engineering amount is small, and the multi-channel digital correlator performance test process is solved Complicated problems are more conducive to the improvement of the accuracy of the digital correlator.
附图说明Description of drawings
图1为本发明一种多通道数字相关器原理示意图；Fig. 1 is a schematic diagram of the principle of a multi-channel digital correlator of the present invention;
图2为本发明一种复相关处理单元原理示意图；Fig. 2 is a schematic diagram of the principle of a complex correlation processing unit of the present invention;
图3为本发明一种多通道数字相关器性能测试方法原理流程图；Fig. 3 is a principle flowchart of a multi-channel digital correlator performance testing method of the present invention;
图4为本发明一种切换控制矩阵器原理示意图；Fig. 4 is a schematic diagram of the principle of a switching control matrix device of the present invention;
图5为本发明一种多通道数字相关器各通道复相关值表示意图。Fig. 5 is a schematic diagram of the complex correlation value table of each channel of a multi-channel digital correlator according to the present invention.
具体实施方式Detailed ways
综合孔径微波辐射计系统中最为关键的部件就是多通道数字相关器，其核心功能为实现任意两个通道之间的复相关运算，多通道数字相关器实现原理如图1所示，主要包括采集单元AD、数字滤波器、数字IQ变换单元、量化处理单元、复相关运算单元。采集单元AD采集实现采集信号的模数变换，经数字滤波得到带限信号，再经过数字IQ变换得到同相分量(0°)和正交分量(90°)，然后对同相分量和正交分量进行量化处理得到工作有效位数，工作有效位数进入复相关运算单元完成复相关值实部和虚部的计算。复相关处理单元原理如图2所示，其中，0°和90°分量分别表示数字IQ变换得到的同相分量和正交分量，通过数字处理实现乘法和累加运算，最终输出复相关值的实部和虚部。The most critical component in the synthetic aperture microwave radiometer system is the multi-channel digital correlator. Its core function is to realize the complex correlation operation between any two channels. The realization principle of the multi-channel digital correlator is shown in Figure 1, mainly including acquisition Unit AD, digital filter, digital IQ transformation unit, quantization processing unit, complex correlation operation unit. The AD acquisition of the acquisition unit realizes the analog-to-digital conversion of the acquisition signal, and obtains the band-limited signal through digital filtering, and then obtains the in-phase component (0°) and quadrature component (90°) through digital IQ transformation, and then performs the in-phase component and quadrature component The quantization process obtains the working effective digit, and the working effective digit enters the complex correlation operation unit to complete the calculation of the real part and the imaginary part of the complex correlation value. The principle of the complex correlation processing unit is shown in Figure 2, where the 0° and 90° components respectively represent the in-phase component and the quadrature component obtained by the digital IQ transformation, and the multiplication and accumulation operations are realized through digital processing, and finally the real part of the complex correlation value is output and the imaginary part.
本发明针对现有技术的不足，提出了一种多通道数字相关器性能测试方法，如图3所示包括如下步骤：The present invention is aimed at the deficiencies in the prior art, proposes a kind of multi-channel digital correlator performance test method, as shown in Figure 3, comprises the following steps:
(1)采用两路非相关的能够产生带限(即带宽有限的)噪声信号噪声源，并分别记为噪声源1、噪声源2，令噪声源1产生噪声信号1、噪声源2产生噪声信号2，将噪声信号1送至功分器1，功分器1进行功分处理后得到功分a信号和功分b信号，将功分a信号送至移相器1，移相器1进行移相处理后得到待测噪声A信号，将噪声信号2送至功分器2，功分器2进行功分处理后得到功分c信号和功分d信号，将功分c信号送至移相器2，移相器2进行移相处理后得到待测噪声C信号，将功分b信号送至可调衰减器1，可调衰减器1进行衰减处理后得到P1信号，将功分d信号送至可调衰减器2，可调衰减器2进行衰减处理后得到P2信号，将P1和P2信号送至功分器3，功分器3进行合路处理后得到待测噪声B信号，其中，移相器1的移相值为θ1，移相器2的移相值为θ2，θ1≠θ2，θ1、θ2>0，可调衰减器1的衰减量与可调衰减器2的衰减量均大于0且不相同，P1信号的功率为P1，P2信号的功率为P2。(1) Two non-correlated noise sources that can generate band-limited (that is, limited bandwidth) noise signals are used, and they are respectively recorded as noise source 1 and noise source 2, so that noise source 1 generates noise signal 1 and noise source 2 generates noise Signal 2, the noise signal 1 is sent to the power divider 1, and the power divider 1 performs power division processing to obtain the power division a signal and the power division b signal, and the power division a signal is sent to the phase shifter 1, and the phase shifter 1 After performing phase shift processing, the noise A signal to be measured is obtained, and the noise signal 2 is sent to the power divider 2, and the power divider 2 performs power division processing to obtain the power division c signal and the power division d signal, and the power division c signal is sent to Phase shifter 2, phase shifter 2 obtains the noise C signal to be measured after phase shifting processing, sends the power division b signal to the adjustable attenuator 1, and the adjustable attenuator 1 performs attenuation processing to obtain the P1 signal, and divides the power The d signal is sent to the adjustable attenuator 2, and the adjustable attenuator 2 is attenuated to obtain the P2 signal, and the P1 and P2 signals are sent to the power divider 3, and the power divider 3 is combined to obtain the noise B signal to be measured , where the phase shift value of phase shifter 1 is θ 1 , the phase shift value of phase shifter 2 is θ 2 , θ 1 ≠ θ 2 , θ 1 , θ 2 >0, the attenuation of adjustable attenuator 1 is the same as The attenuation amounts of the adjustable attenuators 2 are all greater than 0 and different, the power of the P1 signal is P 1 , and the power of the P2 signal is P 2 .
(2)调节可调衰减器1的衰减量与可调衰减器2的衰减量，直至待测噪声A、待测噪声B、待测噪声C的信号功率均为P，调节移相器1的移相值与移相器2的移相值使得移相器1的移相值θ1、移相器2的移相值θ2不相同，其中，P＝P1+P2；然后将待测噪声A信号、待测噪声B信号、待测噪声C信号分别送至切换控制矩阵器。(2) Adjust the attenuation of the adjustable attenuator 1 and the attenuation of the adjustable attenuator 2 until the signal power of the noise to be measured A, the noise to be measured B, and the noise to be measured C are all P, adjust the phase shifter 1 The phase shift value and the phase shift value of phase shifter 2 make the phase shift value θ 1 of phase shifter 1 and the phase shift value θ 2 of phase shifter 2 different, wherein, P=P 1 +P 2 ; The noise A signal to be measured, the noise B signal to be measured, and the noise C signal to be measured are respectively sent to the switching control matrix.
(3)如图4所示本发明方法中切换控制矩阵器由开关矩阵和功分器组成，开关矩阵为3×3开关矩阵，3×3开关矩阵包括触点m1、m2、m3、n1、n2、n3，共有六种触点切换组合接通方式。将待测噪声A信号送至开关矩阵m1端口，将待测噪声B信号送至开关矩阵m2端口，将待测噪声C信号送至开关矩阵m3端口，开关矩阵进行切换处理，得到开关矩阵输出的n1、n2和n3信号(通过开关矩阵中开关的切换使得待测噪声A信号、待测噪声B信号、待测噪声C信号均能够分别与功分器4、功分器5、功分器6接通，共有六种接通方式，本发明方法以一种接通方式进行说明)，将n1信号送至功分器4，功分器4进行一分十六功分处理后得到待测试源通道1，待测试源通道2，待测试源通道3，…，待测试源通道16，将n2信号送至功分器5，功分器5进行一分十六功分处理(可以为一份n路功分处理，其中，n为正整数)后得到待测试源通道17，待测试源通道18，待测试源通道19，…，待测试源通道32，将n3信号送至功分器6，功分器6进行一分十六功分处理后得到待测试源通道33，待测试源通道34，…，待测试源通道48，待测试源通道1至待测试源通道48为接入待测试多通道相关器各个通道的测试信号。(3) switching control matrix is made up of switch matrix and power divider in the inventive method as shown in Figure 4, and switch matrix is 3 * 3 switch matrix, and 3 * 3 switch matrix comprises contact m1, m2, m3, n1, n2, n3, a total of six contact switching combination connection methods. Send the noise A signal to be measured to the m1 port of the switch matrix, send the noise B signal to be measured to the m2 port of the switch matrix, and send the noise C signal to be measured to the m3 port of the switch matrix, and the switch matrix performs switching processing to obtain the output of the switch matrix n1, n2 and n3 signals (by switching the switches in the switch matrix, the noise A signal to be measured, the noise B signal to be measured, and the noise C signal to be measured can all be connected to the power divider 4, power divider 5, and power divider 6 respectively. connected, there are six ways to connect, and the method of the present invention is described in one way to connect), and the n1 signal is sent to the power divider 4, and the power divider 4 performs one-to-sixteen power points processing to obtain the source to be tested Channel 1, source channel 2 to be tested, source channel 3 to be tested, ..., source channel 16 to be tested, send the n2 signal to the power divider 5, and the power divider 5 performs one-to-sixteen power division processing (can be a n road power division processing, wherein, n is a positive integer) to obtain the source channel 17 to be tested, the source channel to be tested 18, the source channel to be tested 19, ..., the source channel to be tested 32, and the n3 signal is sent to the power divider 6 , the power divider 6 performs one-to-sixteen power division processing to obtain the source channel to be tested 33, the source channel to be tested 34, ..., the source channel to be tested 48, the source channel to be tested 1 to the source channel to be tested 48 are access to the source channel to be tested Test the test signal of each channel of the multi-channel correlator.
(4)将得到的48路待测试源通道分别送至待测试数字相关器，得到实测的待测试数字相关器各通道间的复相关值，进而得到图5所示的实测的多通道数字相关器各通道复相关值表，其中，图5为了方便对比选取了一种通道行列排列方式，可以选择其他行列排列方式。(4) Send the obtained 48 source channels to be tested to the digital correlator to be tested respectively, and obtain the complex correlation value between each channel of the digital correlator to be tested, and then obtain the measured multi-channel digital correlation shown in Figure 5 The complex correlation value table of each channel of the device, wherein, Figure 5 selects a row and column arrangement of channels for the convenience of comparison, and other row and column arrangements can be selected.
(5)分情况计算预期的待测试数字相关器各通道间的复相关值为：(5) Calculate the complex correlation value between each channel of the expected digital correlator to be tested according to the situation:
如果两个待测试源通道分别为待测噪声A信号功分信号、待测噪声B信号功分信号，则预期的复相关值幅度值|ρAB|为If the two source channels to be tested are the power divided signal of the noise A signal to be tested and the power divided signal of the noise B signal to be tested, then the expected complex correlation value amplitude | ρAB | is
预期的复相关值相位为θ1；The expected complex correlation value phase is θ 1 ;
如果两个待测试源通道分别为待测噪声B信号功分信号、待测噪声C信号功分信号，则预期的复相关值幅度值|ρBC|为If the two source channels to be tested are respectively the power divided signal of the noise B signal to be tested and the power divided signal of the noise C signal to be tested, then the expected amplitude value of the complex correlation value |ρ BC | is
预期的复相关值相位为θ2；The expected complex correlation value phase is θ 2 ;
如果两个待测试源通道分别为待测噪声A信号功分信号、待测噪声C信号功分信号，则预期的复相关值幅度值|ρAC|＝0，预期的复相关值相位为0，遍历待测试数字相关器各通道，得到预期的待测试数字相关器各通道间的复相关值，进而得到图5所示的预期的多通道数字相关器各通道复相关值表。If the two source channels to be tested are the power divided signal of the noise A signal to be tested and the power divided signal of the noise C signal to be tested, then the expected complex correlation value amplitude |ρ AC |=0, and the expected complex correlation value phase is 0 , traverse each channel of the digital correlator to be tested, obtain the expected complex correlation value between each channel of the digital correlator to be tested, and then obtain the expected complex correlation value table of each channel of the multi-channel digital correlator shown in FIG. 5 .
(6)将实测的多通道数字相关器各个通道间的复相关值表中的各个复相关值与预期的多通道数字相关器各通道复相关值表中对应的复相关值比较，最终得到待测试多通道数字相关器测试精度并完成判断。其中，待测试多通道数字相关器测试精度计算、判断包括如下步骤：(6) Compare each complex correlation value in the complex correlation value table between each channel of the multi-channel digital correlator measured with the corresponding complex correlation value in the expected multi-channel digital correlator complex correlation value table of each channel, and finally get the Test the accuracy of the multi-channel digital correlator and complete the judgment. Among them, the calculation and judgment of the test accuracy of the multi-channel digital correlator to be tested include the following steps:
(7)选取两个通道，计算实测的当前两个通道的复相关值、预期的当前两个通道的复相关值的差值，然后得到当前两个通道的精度；(7) Select two channels, calculate the difference between the complex correlation values of the current two channels measured and the expected complex correlation values of the current two channels, and then obtain the accuracy of the current two channels;
(8)遍历待测试数字相关器中的所有通道，得到任意两个通道的精度，当待测试数字相关器俩通道精度的相位不小于1，俩通道精度的幅度值不大于0.99时，待测试数字相关器的当前俩通道可用，否则待测试数字相关器的当前俩通道不可用。(8) Traverse all channels in the digital correlator to be tested to obtain the accuracy of any two channels. When the phase of the accuracy of the two channels of the digital correlator to be tested is not less than 1, and the amplitude value of the accuracy of the two channels is not greater than 0.99, the accuracy of the two channels is not greater than 0.99. The current two channels of the digital correlator are available, otherwise the current two channels of the digital correlator to be tested are unavailable.
本发明说明书中未作详细描述的内容属本领域技术人员的公知技术。The content that is not described in detail in the description of the present invention belongs to the well-known technology of those skilled in the art.
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