CN106093624B - A kind of multi-channel digital correlator performance test methods - Google Patents
A kind of multi-channel digital correlator performance test methods Download PDFInfo
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Abstract
A kind of multi-channel digital correlator performance test methods, two-way uncorrelated noise signal is generated first, and function point processing is carried out respectively, the two-way function sub-signal that function is got is subjected to phase shift and obtains two-way noise signal, remaining two-way is decayed, third road noise acoustical signal is obtained after combining, adjust attenuation, phase shift value is until three road noise acoustical signals are met the requirements, then the progress function point processing of three road noise acoustical signals is obtained into multichannel source channels to be tested and sent to digital correlator to be tested, obtain actual measurement complex correlation value, expected complex correlation value is calculated simultaneously, finally according to actual measurement complex correlation value, it is expected that complex correlation value obtains digital correlator precision to be tested and completes when digital correlator accuracy test to be tested.The method of the present invention realizes digital correlator multiplexer channel to be tested by using switching control matrix device while testing, and solves the problems, such as that manual operation in the prior art is excessive and long-time performance drift introduces error, has preferable applied value.
Description
Technical field
The present invention relates to Space Microwave remote sensing technology fields, especially a kind of multi-channel digital correlator performance test side
Method.
Background technique
The most key component is exactly multi-channel digital correlator, core function in synthetic aperture microwave radiometer system
To realize the multiple correlation operation between any two channel, multi-channel digital correlator multiple correlation result precision directly determines to integrate
The accuracy and accuracy of aperture microwave radiometer measuring results, and then radiometer system Key Performance Indicator is influenced, because
This needs a kind of multi-channel digital correlator performance test methods.
Existing multi-channel digital correlator test method is mainly based upon the complex correlation value test of two paths of signals, this method
Multiple channel test is realized by replacing different TCH test channels.But with the increase of TCH test channel number, above-mentioned test method can be led
It causes that test process is many and diverse, heavy workload, may result in error additionally, due to artificial repeatedly replacement connection relationship and increase, Er Qiechang
The test result drift that time test introduces can equally make test error increase.
Summary of the invention
Present invention solves the technical problem that being：One kind has been overcome the deficiencies of the prior art and provide by using switching control
Matrix device realizes digital correlator multiplexer channel to be tested while testing, and it is excessive and long to solve manual operation in the prior art
The multi-channel digital correlator performance test methods for the problem of time performance drift introduces error.
The technical solution of the invention is as follows：A kind of multi-channel digital correlator performance test methods, include the following steps：
(1) the irrelevant noise signal of two-way is generated, and is denoted as the first noise signal, the second noise signal respectively, then
Divide a signal, function to divide b signal for function is obtained after the progress function point processing of the first noise signal, the second noise signal progress function is existed respectively
Reason obtains function and c signal and function is divided to divide d signal；
(2) noise a-signal to be measured is obtained after dividing a signal to send to the progress phase shift processing of the first phase shifter function, divides c to believe function
It number send and to obtain noise C signal to be measured after carrying out phase shift processing to the second phase shifter, wherein the phase shift value of the first phase shifter is θ1,
The phase shift value of second phase shifter is θ2, θ1≠θ2, θ1、θ2>0；
(3) divide b signal to send to the first adjustable attenuator progress attenuation processing function to obtain P1 signal, divide d signal to send function
P2 signal is obtained after carrying out attenuation processing to the second adjustable attenuator, obtains to be measured make an uproar after P1 and P2 signal is combined processing
Sound B signal, wherein the attenuation of the first adjustable attenuator and the attenuation of the second adjustable attenuator are all larger than 0 and not identical, P1
The power of signal is P1, the power of P2 signal is P2；
(4) adjust the first adjustable attenuator attenuation and the second adjustable attenuator attenuation until noise A to be measured, to
Survey noise B, the signal power of noise C to be measured is P, wherein P=P1+P2；
(5) noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured are subjected to function point processing respectively, obtained more
Road source channels to be tested are simultaneously sent respectively to digital correlator to be tested, each interchannel of digital correlator to be tested surveyed
Complex correlation value；The source channels to be tested are noise a-signal to be measured, noise B signal to be measured or noise C signal function to be measured point
Handle obtained test signal；
(6) complex correlation value of the expected each interchannel of digital correlator to be tested of calculating is：
If two source channels to be tested are respectively noise a-signal function sub-signal to be measured, noise B signal function to be measured point letter
Number, then expected complex correlation value range value | ρAB| it is
Expected complex correlation value phase is θ1；
If two source channels to be tested are respectively noise B signal function sub-signal to be measured, noise C signal function to be measured point letter
Number, then expected complex correlation value range value | ρBC| it is
Expected complex correlation value phase is θ2；
If two source channels to be tested are respectively noise a-signal function sub-signal to be measured, noise C signal function to be measured point letter
Number, then expected complex correlation value range value | ρAC|=0, it is contemplated that complex correlation value phase be 0；It is each to traverse digital correlator to be tested
Channel obtains the complex correlation value of expected each interchannel of digital correlator to be tested；
(7) according to the complex correlation value of each interchannel of digital correlator to be tested of actual measurement, expected digital correlation to be tested
The precision of each interchannel of digital correlator to be tested is calculated in the complex correlation value of each interchannel of device；
(8) when the phase of two channel precision of digital correlator to be tested is not less than 1, the range value of two channel precision is not more than
When 0.99, current two channel of digital correlator to be tested is available, and otherwise current two channel of digital correlator to be tested can not
With.
The complex correlation value of each interchannel of digital correlator to be tested according to actual measurement, expected digital phase to be tested
The method for the precision that each interchannel of digital correlator to be tested is calculated in the complex correlation value for closing each interchannel of device includes following step
Suddenly：
(1) arbitrarily choose two channels, calculate actual measurement when the first two channel complex correlation value, it is expected when the first two lead to
The difference of the complex correlation value in road, and then obtain the precision when the first two channel；
(2) all channels in digital correlator to be tested are traversed, the precision in any two channel is obtained.
The bandwidth of noise signal in the step (1) is limited.
Described carries out noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured function point processing respectively, obtains
The method to digital correlator to be tested is sent to include the following steps to multichannel source channels to be tested and respectively：
(1) noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured are sent to switch matrix；
(2) closure switched in control switch matrix is so that by noise a-signal to be measured, noise B signal to be measured, noise to be measured
C signal can be sent respectively to the 4th power splitter, the 5th power splitter, the 6th power splitter, wherein the 4th power splitter, the 5th power splitter,
The digital correlator channel to be tested of 6th power splitter connection is different；
(3) the 4th power splitter, the 5th power splitter, the 6th power splitter are controlled to noise a-signal to be measured, the noise to be measured of input
B signal or noise C signal to be measured carry out function point processing, obtain multichannel source channels to be tested and send respectively to be tested to connection
Digital correlator channel.
4th power splitter, the 5th power splitter, the 6th power splitter are one point 16, and digital correlator to be tested is
48 paths.
The switch matrix includes six kinds of mode of communicating.
The advantages of the present invention over the prior art are that：
(1) the method for the present invention compared with prior art, realizes digital phase to be tested by using switching control matrix device
Device multiplexer channel is closed to test simultaneously, solve in existing multi-channel digital correlator Performance Testing Technology manual operation excessively and
Long-time performance drift introduces the problem of error；
(2) the method for the present invention compared with prior art, realizes multi-channel digital phase by regulated attenuator and phase shifter
The traversal for closing device complex correlation value amplitude and phase, solves existing multi-channel digital correlator Performance Testing Technology complex correlation value
The infull problem of Test coverage；
(3) compared with prior art, the present invention core processing process only need to by setting switch matrix, regulated attenuator and
Phase shifter can realize, realize that simple, project amount is small, solve that multi-channel digital correlator performance test process is many and diverse to ask
Topic, is more advantageous to the raising of digital correlator precision.
Detailed description of the invention
Fig. 1 is a kind of multi-channel digital correlator schematic illustration of the present invention；
Fig. 2 is a kind of multiple correlation processing unit schematic illustration of the present invention；
Fig. 3 is a kind of multi-channel digital correlator performance test methods principle flow chart of the present invention；
Fig. 4 is a kind of switching control matrix device schematic illustration of the present invention；
Fig. 5 is that a kind of each channel complex correlation value of multi-channel digital correlator of the present invention indicates to be intended to.
Specific embodiment
The most key component is exactly multi-channel digital correlator, core function in synthetic aperture microwave radiometer system
To realize the multiple correlation operation between any two channel, multi-channel digital correlator realization principle is as shown in Figure 1, mainly include
Acquisition unit AD, digital filter, number IQ converter unit, quantization processing unit, multiple correlation arithmetic element.Acquisition unit AD is adopted
Collection realizes the analog to digital conversion of acquisition signal, obtains band-limited signal through digital filtering, converts to obtain in-phase component using digital IQ
(0 °) and quadrature component (90 °) then carries out quantification treatment to in-phase component and quadrature component and obtains work number of significant digit, works
Number of significant digit enters the calculating that multiple correlation arithmetic element completes complex correlation value real and imaginary parts.Multiple correlation processing unit principle is as schemed
Shown in 2, wherein 0 ° and 90 ° of components respectively indicate the in-phase component and quadrature component that digital IQ is converted, and pass through digital processing
Realize multiplication and accumulating operation, the real and imaginary parts of final output complex correlation value.
In view of the deficiencies of the prior art, the present invention proposes a kind of multi-channel digital correlator performance test methods, such as Fig. 3
It is shown to include the following steps：
(1) (i.e. bandwidth is limited) noise signal noise source is limited using the irrelevant band that can generate of two-way, and remembered respectively
For noise source 1, noise source 2, enable that noise source 1 generates noise signal 1, noise source 2 generates noise signal 2, by noise signal 1 send to
Power splitter 1 obtains function after the progress function point processing of power splitter 1 and a signal and function is divided to divide b signal, divides a signal to send to phase shifter 1 function,
Phase shifter 1 obtains noise a-signal to be measured after carrying out phase shift processing, noise signal 2 is sent to power splitter 2, power splitter 2 carries out function point
Function is obtained after processing divides c signal and function to divide d signal, divides c signal to send to phase shifter 2 function, phase shifter 2 obtains after carrying out phase shift processing
To noise C signal to be measured, b signal is divided to send to adjustable attenuator 1 function, adjustable attenuator 1 obtains P1 letter after carrying out attenuation processing
Number, divide d signal to send to adjustable attenuator 2 function, adjustable attenuator 2 obtains P2 signal after carrying out attenuation processing, and P1 and P2 is believed
It number send to power splitter 3, power splitter 3 obtains noise B signal to be measured after being combined processing, wherein the phase shift value of phase shifter 1 is
θ1, the phase shift value of phase shifter 2 is θ2, θ1≠θ2, θ1、θ2>0, the attenuation and the attenuation of adjustable attenuator 2 of adjustable attenuator 1
It is all larger than 0 and not identical, the power of P1 signal is P1, the power of P2 signal is P2。
(2) attenuation of adjustable attenuator 1 and the attenuation of adjustable attenuator 2 are adjusted, until noise A to be measured, to be measured making an uproar
Sound B, noise C to be measured signal power be P, the phase shift value and the phase shift value of phase shifter 2 for adjusting phase shifter 1 make phase shifter 1
Phase shift value θ1, phase shifter 2 phase shift value θ2It is not identical, wherein P=P1+P2；Then by noise a-signal to be measured, noise B to be measured
Signal, noise C signal to be measured are sent respectively to switching control matrix device.
(3) switching control matrix device is made of switch matrix and power splitter in the method for the present invention as shown in Figure 4, switch matrix
For 3 × 3 switch matrix, 3 × 3 switch matrix include contact m1, m2, m3, n1, n2, n3, share six kinds of contact change-over combinations and connect
Mode.Noise a-signal to be measured is sent to the port switch matrix m1, noise B signal to be measured is sent to the port switch matrix m2, it will be to
Survey noise C signal send to the port switch matrix m3, switch matrix switches over processing, obtain switch matrix export n1, n2 and
N3 signal is (by the switching that switchs in switch matrix so that noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured
It can be connected respectively with power splitter 4, power splitter 5, power splitter 6, share six kinds of getting types, the method for the present invention is with a kind of connection
Mode is illustrated), n1 signal is sent to power splitter 4, it is logical to obtain source to be tested after the progress one point of 16 function point processing of power splitter 4
Road 1, source channels 2 to be tested, source channels 3 ... to be tested, source channels 16 to be tested send n2 signal to power splitter 5, power splitter 5
Source channels to be tested are obtained after carrying out one point of 16 function point processing (can be the portion road n function point processing, wherein n is positive integer)
17, source channels 18 to be tested, source channels 19 ... to be tested, source channels 32 to be tested send n3 signal to power splitter 6, power splitter
6 carry out obtaining source channels 33 to be tested after one point of 16 function point is handled, source channels 34 ... to be tested, source channels 48 to be tested, to
Testing source channels 1 to source channels 48 to be tested is the test signal for accessing each channel of multichannel correlator to be tested.
(4) obtained 48 roads source channels to be tested are sent respectively to digital correlator to be tested, that is surveyed is to be tested
The complex correlation value of each interchannel of digital correlator, and then each channel of multi-channel digital correlator for obtaining actual measurement shown in fig. 5 is multiple
Correlation table, wherein Fig. 5 has chosen a kind of channel ranks arrangement mode in order to facilitate comparison, can choose the arrangement of other ranks
Mode.
(5) complex correlation value of point expected each interchannel of digital correlator to be tested of situation calculating is：
If two source channels to be tested are respectively noise a-signal function sub-signal to be measured, noise B signal function to be measured point letter
Number, then expected complex correlation value range value | ρAB| it is
Expected complex correlation value phase is θ1；
If two source channels to be tested are respectively noise B signal function sub-signal to be measured, noise C signal function to be measured point letter
Number, then expected complex correlation value range value | ρBC| it is
Expected complex correlation value phase is θ2；
If two source channels to be tested are respectively noise a-signal function sub-signal to be measured, noise C signal function to be measured point letter
Number, then expected complex correlation value range value | ρAC|=0, it is contemplated that complex correlation value phase be 0, it is each to traverse digital correlator to be tested
Channel obtains the complex correlation value of expected each interchannel of digital correlator to be tested, and then obtains expected multi-pass shown in fig. 5
Each channel complex correlation value table of road digital correlator.
(6) by each complex correlation value in the complex correlation value table of each interchannel of multi-channel digital correlator of actual measurement and in advance
Corresponding complex correlation value compares in each channel complex correlation value table of the multi-channel digital correlator of phase, finally obtains multichannel to be tested
Digital correlator measuring accuracy simultaneously is completed to judge.Wherein, multi-channel digital correlator measuring accuracy to be tested calculates, judgement includes
Following steps：
(7) two channels are chosen, calculate actual measurement when the first two channel complex correlation value, expected work as the first two channel
Then the difference of complex correlation value obtains the precision when the first two channel；
(8) all channels in digital correlator to be tested are traversed, the precision in any two channel are obtained, when number to be tested
The phase of two channel precision of word correlator is not less than 1, when the range value of two channel precision is not more than 0.99, digital correlation to be tested
Current two channel of device is available, and otherwise current two channel of digital correlator to be tested is unavailable.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (6)
1. a kind of multi-channel digital correlator performance test methods, it is characterised in that include the following steps：
(1) the irrelevant noise signal of two-way is generated, and is denoted as the first noise signal, the second noise signal respectively, then by the
Obtaining function after the progress function point processing of one noise signal divides a signal, function to divide b signal, and the second noise signal is carried out function point and is handled
C signal and function is divided to divide d signal to function；
(2) noise a-signal to be measured is obtained after dividing a signal to send to the progress phase shift processing of the first phase shifter function, divides c signal to send function
Noise C signal to be measured is obtained after carrying out phase shift processing to the second phase shifter, wherein the phase shift value of the first phase shifter is θ1, second
The phase shift value of phase shifter is θ2, θ1≠θ2, θ1、θ2>0；
(3) divide b signal to send function to carry out attenuation processing to the first adjustable attenuator and obtain P1 signal, divide d signal to send to the function
Two adjustable attenuators obtain P2 signal after carrying out attenuation processing, obtain noise B to be measured after P1 and P2 signal is combined processing
Signal, wherein the attenuation of the first adjustable attenuator and the attenuation of the second adjustable attenuator are all larger than 0 and not identical, P1 letter
Number power be P1, the power of P2 signal is P2；
(4) attenuation of the attenuation and the second adjustable attenuator that adjust the first adjustable attenuator up to noise A to be measured, to be measured make an uproar
Sound B, noise C to be measured signal power be P, wherein P=P1+P2；
(5) noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured are subjected to function point processing respectively, multichannel is obtained and waits for
Test source channels are simultaneously sent respectively to digital correlator to be tested, the complex phase for each interchannel of digital correlator to be tested surveyed
Pass value；The source channels to be tested are point processing of noise a-signal to be measured, noise B signal to be measured or noise C signal function to be measured
Obtained test signal；
(6) complex correlation value of the expected each interchannel of digital correlator to be tested of calculating is：
If two source channels to be tested are respectively noise a-signal function sub-signal to be measured, noise B signal function sub-signal to be measured,
Expected complex correlation value range value | ρAB| it is
Expected complex correlation value phase is θ1；
If two source channels to be tested are respectively noise B signal function sub-signal to be measured, noise C signal function sub-signal to be measured,
Expected complex correlation value range value | ρBC| it is
Expected complex correlation value phase is θ2；
If two source channels to be tested are respectively noise a-signal function sub-signal to be measured, noise C signal function sub-signal to be measured,
Expected complex correlation value range value | ρAC|=0, it is contemplated that complex correlation value phase be 0；Each channel of digital correlator to be tested is traversed,
Obtain the complex correlation value of expected each interchannel of digital correlator to be tested；
(7) each according to the complex correlation value of each interchannel of digital correlator to be tested of actual measurement, expected digital correlator to be tested
The precision of each interchannel of digital correlator to be tested is calculated in the complex correlation value of interchannel；
(8) when the phase of two channel precision of digital correlator to be tested is not less than 1, the range value of two channel precision is not more than 0.99
When, current two channel of digital correlator to be tested is available, and otherwise current two channel of digital correlator to be tested is unavailable.
2. a kind of multi-channel digital correlator performance test methods according to claim 1, it is characterised in that：The root
The complex correlation value of each interchannel of digital correlator to be tested factually surveyed, expected each interchannel of digital correlator to be tested are answered
The method that correlation value calculation obtains the precision of each interchannel of digital correlator to be tested includes the following steps：
(1) two channels are arbitrarily chosen, calculate actual measurement when the first two channel complex correlation value, expected work as the first two channel
The difference of complex correlation value, and then obtain the precision when the first two channel；
(2) all channels in digital correlator to be tested are traversed, the precision in any two channel is obtained.
3. a kind of multi-channel digital correlator performance test methods according to claim 1 or 2, it is characterised in that：It is described
The step of (1) in the bandwidth of noise signal be limited.
4. a kind of multi-channel digital correlator performance test methods according to claim 1 or 2, it is characterised in that：It is described
Noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured are carried out to function point processing respectively, it is to be tested to obtain multichannel
Source channels simultaneously send the method to digital correlator to be tested to include the following steps respectively：
(1) noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured are sent to switch matrix；
(2) closure switched in control switch matrix is so that noise a-signal to be measured, noise B signal to be measured, noise C to be measured are believed
It number can send respectively to the 4th power splitter, the 5th power splitter, the 6th power splitter, wherein the 4th power splitter, the 5th power splitter,
The digital correlator channel to be tested of six power splitters connection is different；
(3) the 4th power splitter, the 5th power splitter, the 6th power splitter is controlled to believe noise a-signal to be measured, the noise B to be measured of input
Number or noise C signal to be measured carry out function point processing, obtain multichannel source channels to be tested and sent respectively to the number to be tested of connection
Word correlator channel.
5. a kind of multi-channel digital correlator performance test methods according to claim 4, it is characterised in that：Described
Four power splitters, the 5th power splitter, the 6th power splitter are one point 16, and digital correlator to be tested is 48 paths.
6. a kind of multi-channel digital correlator performance test methods according to claim 4, it is characterised in that：Described opens
Closing matrix includes six kinds of mode of communicating.
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| CN107782993B (en) * | 2017-09-26 | 2019-10-22 | 西安空间无线电技术研究所 | A kind of test macro and method of digital correlator |
| CN108196271B (en) * | 2017-12-22 | 2020-03-20 | 湖南卫导信息科技有限公司 | Navigation signal zero-delay switching method of darkroom antenna array anti-interference test system |
| CN109274468B (en) * | 2018-11-23 | 2021-04-16 | 中国电子科技集团公司第三十八研究所 | Method and system for testing channel IQ automatic correction function |
| CN109541325B (en) * | 2018-11-27 | 2021-05-11 | 上海航天电子通讯设备研究所 | Satellite-borne one-dimensional synthetic aperture microwave radiation measurement system and measurement method |
| CN110231516B (en) * | 2019-06-14 | 2021-05-11 | 北京无线电计量测试研究所 | Quick variable temperature microwave noise source |
| CN110474695B (en) * | 2019-08-21 | 2021-06-22 | 国家卫星气象中心(国家空间天气监测预警中心) | Method for detecting and optimizing energy mutual interference between microwave radiometer channels |
| CN113125883B (en) * | 2021-03-30 | 2024-07-09 | 中国科学院国家空间科学中心 | Performance test system and method for third-order digital correlator |
| CN113702804B (en) * | 2021-07-26 | 2024-02-09 | 西安空间无线电技术研究所 | Correlation error correction method in multichannel digital correlator |
| CN114710138B (en) * | 2022-06-08 | 2022-09-20 | 成都嘉纳海威科技有限责任公司 | Multi-channel amplification attenuation phase-shift serial port control multifunctional chip |
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