CN106093624A - 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, first two-way uncorrelated noise signal is produced, and carry out merit divisional processing respectively, two-way merit sub-signal merit got carries out phase shift and obtains two-way noise signal, remaining two-way is decayed, the 3rd tunnel noise signal is obtained after closing road, regulation attenuation, phase shift value is until three tunnel noise signals meet requirement, then three tunnel noise signals are carried out merit divisional processing obtain multichannel source channels to be tested and deliver to digital correlator to be tested, obtain surveying complex correlation value, it is calculated expection complex correlation value simultaneously, finally according to actual measurement complex correlation value, expection complex correlation value obtains digital correlator precision to be tested and completes when digital correlator accuracy test to be tested.The inventive method, by using switching control matrix device to achieve digital correlator multiplexer channel to be tested and test simultaneously, solves that manual operation in prior art is too much and long-time performance drift introduces the problem of error, have preferable applied value.
Description
Technical field
The present invention relates to Space Microwave remote sensing technology field, particularly a kind of multi-channel digital correlator performance test side
Method.
Background technology
Parts the most key in synthetic aperture microwave radiometer system are exactly multi-channel digital correlator, its Core Feature
For realizing the multiple correlation computing between any two passage, multi-channel digital correlator multiple correlation result precision directly determines comprehensively
The accuracy of aperture microwave radiometer measuring results and accuracy, and then affect radiometer system Key Performance Indicator, because of
This needs a kind of multi-channel digital correlator performance test methods.
Existing multi-channel digital correlator method of testing is mainly based upon the complex correlation value test of two paths of signals, the method
Multiple channel test is realized by changing different TCH test channel.But being as the increase of TCH test channel number, above-mentioned method of testing can be led
Cause test process is numerous and diverse, workload big, may result in error increase, Er Qiechang additionally, due to artificial annexation of the most repeatedly changing
The test result drift that time test introduces can make test error increase equally.
Summary of the invention
Present invention solves the technical problem that and be: overcome the deficiencies in the prior art, it is provided that be a kind of by using switching control
Matrix device achieves digital correlator multiplexer channel to be tested and tests simultaneously, solves manual operation in prior art too much and long
Time performance drift introduces the multi-channel digital correlator performance test methods of the problem of error.
The technical solution of the present invention is: a kind of multi-channel digital correlator performance test methods, comprises the steps:
(1) produce the uncorrelated noise signal of two-way, and be designated as the first noise signal, the second noise signal respectively, then
Obtaining merit after first noise signal is carried out merit divisional processing divides a signal, merit to divide b signal, and the second noise signal is carried out merit office
Reason obtains merit and divides c signal and merit to divide d signal；
(2) merit is divided a signal deliver to the first phase shifter carry out phase shift process after obtain noise a-signal to be measured, divide c to believe merit
Number deliver to the second phase shifter carry out phase shift process after obtain noise C signal to be measured, wherein, the phase shift value of the first phase shifter is θ1,
The phase shift value of the first phase shifter is θ2, θ1≠θ2, θ1、θ2>0；
(3) merit is divided b signal deliver to the first adjustable attenuator carry out attenuation processing and obtain P1 signal, merit is divided d signal send
Obtain P2 signal after carrying out attenuation processing to the second adjustable attenuator, after carrying out P1 and P2 signal closing road process, obtain to be measured making an uproar
Sound B signal, wherein, the attenuation of the first adjustable attenuator is all higher than 0 with the attenuation of the second adjustable attenuator and differs, P1
The power of signal is P1, the power of P2 signal is P2；
(4) attenuation of the first adjustable attenuator is regulated with the attenuation of the second adjustable attenuator until noise A to be measured, treating
Survey noise B, the signal power of noise C to be measured is P, wherein, and P=P1+P2；
(5) noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured are carried out merit divisional processing respectively, obtain many
Road source channels to be tested also delivers to digital correlator to be tested respectively, and the digital correlator to be tested obtaining actual measurement is each interchannel
Complex correlation value；Described source channels to be tested is that noise a-signal to be measured, noise B signal to be measured or noise C signal merit to be measured are divided
Process the test signal obtained；
(6) calculating the intended each interchannel complex correlation value of digital correlator to be tested is:
If two source channels to be tested are respectively noise a-signal merit sub-signal to be measured, noise B signal merit to be measured divides letter
Number, then intended complex correlation value range value | ρAB| for
Intended complex correlation value phase place is θ1；
If two source channels to be tested are respectively noise B signal merit sub-signal to be measured, noise C signal merit to be measured divides letter
Number, then intended complex correlation value range value | ρBC| for
Intended complex correlation value phase place is θ2；
If two source channels to be tested are respectively noise a-signal merit sub-signal to be measured, noise C signal merit to be measured divides letter
Number, then intended complex correlation value range value | ρAC|=0, it is contemplated that complex correlation value phase place be 0；Travel through digital correlator to be tested each
Passage, obtains the intended each interchannel complex correlation value of digital correlator to be tested；
(7) according to each interchannel complex correlation value of digital correlator to be tested, the intended digital correlation to be tested of actual measurement
The each interchannel complex correlation value of device is calculated each interchannel precision of digital correlator to be tested；
(8) when the phase place of digital correlator two passage precision to be tested is not less than 1, and the range value of two passage precision is not more than
When 0.99, current two passages of digital correlator to be tested can be used, and current two passages of digital correlator the most to be tested can not
With.
The described each interchannel complex correlation value of digital correlator to be tested according to actual measurement, intended numeral phase to be tested
The pass each interchannel complex correlation value of device is calculated the method for each interchannel precision of digital correlator to be tested and includes walking as follows
Rapid:
(1) arbitrarily choose two passages, calculate the complex correlation value when the first two passage of actual measurement, intended lead to when the first two
The difference of the complex correlation value in road, and then obtain when the precision of the first two passage；
(2) travel through all passages in digital correlator to be tested, obtain the precision of any two passage.
The bandwidth of the described noise signal in step (1) is limited.
Described carries out merit divisional processing respectively by noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured,
To multichannel source channels to be tested and deliver to the method for digital correlator to be tested respectively and comprise the steps:
(1) noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured are delivered to switch matrix；
(2) Guan Bi controlling switch matrix breaker in middle makes noise a-signal to be measured, noise B signal to be measured, noise to be measured
C signal can deliver to the 4th power splitter, the 5th power splitter, the 6th power splitter respectively, wherein, the 4th power splitter, the 5th power splitter,
The digital correlator passage to be tested that 6th power splitter connects is different；
(3) the 4th power splitter, the 5th power splitter, the 6th power splitter are controlled to the noise a-signal to be measured of input, noise to be measured
B signal or noise C signal to be measured carry out merit divisional processing, obtain multichannel source channels to be tested and deliver to the to be tested of connection respectively
Digital correlator passage.
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.
Described switch matrix includes six kinds of mode of communicating.
Present invention advantage compared with prior art is:
(1) the inventive method is compared with prior art, by using switching control matrix device to achieve numeral phase to be tested
Close device multiplexer channel to test simultaneously, solve in existing multi-channel digital correlator Performance Testing Technology manual operation too much and
The problem that long-time performance drift introduces error；
(2) the inventive method is compared with prior art, achieves multi-channel digital phase by regulated attenuator and phase shifter
Close device complex correlation value amplitude and the traversal of phase place, solve existing multi-channel digital correlator Performance Testing Technology complex correlation value
The problem that Test coverage is the most complete；
(3) present invention is compared with prior art, core processing process only need to by arrange switch matrix, regulated attenuator and
Phase shifter just can realize, it is achieved simple, quantities is little, solves multi-channel digital correlator numerous and diverse the asking of performance test process
Topic, is more beneficial for the raising of digital correlator precision.
Accompanying drawing explanation
Fig. 1 is one multi-channel digital correlator principle schematic of the present invention；
Fig. 2 is one multiple correlation processing unit principle schematic of the present invention；
Fig. 3 is one multi-channel digital correlator performance test methods principle flow chart of the present invention；
Fig. 4 is one switching control matrix device principle schematic of the present invention；
Fig. 5 is that one multi-channel digital correlator of the present invention each passage complex correlation value represents intention.
Detailed description of the invention
Parts the most key in synthetic aperture microwave radiometer system are exactly multi-channel digital correlator, its Core Feature
For realizing the multiple correlation computing between any two passage, multi-channel digital correlator realizes principle as it is shown in figure 1, mainly include
Collecting unit AD, digital filter, numeral IQ converter unit, quantification treatment unit, multiple correlation arithmetic element.Collecting unit AD adopts
Collection realizes gathering the analog to digital conversion of signal, obtains band-limited signal through digital filtering, then obtains in-phase component through numeral IQ conversion
(0 °) and quadrature component (90 °), then carry out quantification treatment to in-phase component and quadrature component and obtain work number of significant digit, work
Number of significant digit enters multiple correlation arithmetic element and completes the calculating of complex correlation value real part and imaginary part.Multiple correlation processing unit principle such as figure
Shown in 2, wherein, 0 ° and 90 ° of components represent the in-phase component and quadrature component that numeral IQ conversion obtains respectively, pass through digital processing
Realize multiplication and accumulating operation, the real part of final output complex correlation value and imaginary part.
The present invention is directed to the deficiencies in the prior art, it is proposed that a kind of multi-channel digital correlator performance test methods, such as Fig. 3
Shown in comprise the steps:
(1) use the uncorrelated band that can produce of two-way to limit (the most band-limited) noise signal noise source, and remember respectively
For noise source 1, noise source 2, make noise source 1 produce noise signal 1, noise source 2 produces noise signal 2, noise signal 1 is delivered to
Power splitter 1, power splitter 1 obtains merit and divides a signal and merit to divide b signal, merit is divided a signal deliver to the phase shifter 1 after carrying out merit divisional processing,
Phase shifter 1 obtains noise a-signal to be measured after carrying out phase shift process, and noise signal 2 is delivered to power splitter 2, and power splitter 2 carries out merit and divides
Obtaining merit after process divides c signal and merit to divide d signal, and merit is divided c signal deliver to the phase shifter 2, and the phase shifter 2 is carried out after phase shift process
To noise C signal to be measured, merit being divided b signal deliver to adjustable attenuator 1, adjustable attenuator 1 obtains P1 letter after carrying out attenuation processing
Number, merit is divided d signal deliver to adjustable attenuator 2, adjustable attenuator 2 obtains P2 signal after carrying out attenuation processing, is believed by P1 and P2
Number delivering to power splitter 3, power splitter 3 carries out closing after road processes and obtains noise B signal to be measured, and 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 of adjustable attenuator 1 and the attenuation of adjustable attenuator 2
Being all higher than 0 and differ, the power of P1 signal is P1, the power of P2 signal is P2。
(2) attenuation of attenuation and the adjustable attenuator 2 of regulation adjustable attenuator 1, until noise A to be measured, to be measured making an uproar
Sound B, the signal power of noise C to be measured are P, and the phase shift value of regulation phase shifter 1 makes the phase shifter 1 with the phase shift value of phase shifter 2
Phase shift value θ1, phase shift value θ of phase shifter 22Differ, wherein, P=P1+P2；Then by noise a-signal to be measured, noise B to be measured
Signal, noise C signal to be measured deliver to switching control matrix device respectively.
(3) switching control matrix device is made up of switch matrix and power splitter in the inventive method as shown in Figure 4, switch matrix
Being 3 × 3 switch matrix, 3 × 3 switch matrix include contact m1, m2, m3, n1, n2, n3, have six kinds of contact change-over combinations and connect
Mode.Noise a-signal to be measured is delivered to switch matrix m1 port, noise B signal to be measured is delivered to switch matrix m2 port, will treat
Survey noise C signal deliver to switch matrix m3 port, switch matrix switches over process, obtain switch matrix output n1, n2 and
N3 signal (makes noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured by the switching of switch matrix breaker in middle
All can connect with power splitter 4, power splitter 5, power splitter 6 respectively, have six kinds of getting types, the inventive method is connected with one
Mode illustrates), n1 signal is delivered to power splitter 4, power splitter 4 obtains source to be tested and leads to after carrying out one point of 16 merit divisional processing
Road 1, source channels 2 to be tested, source channels 3 to be tested ..., source channels 16 to be tested, n2 signal is delivered to power splitter 5, power splitter 5
Source channels to be tested is obtained after carrying out one point of 16 merit divisional processing (can be a n road merit divisional 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, n3 signal is delivered to power splitter 6, power splitter
6 carry out one point of 16 merit divisional processing after obtain source channels 33 to be tested, source channels 34 to be tested ..., source to be tested to passage 48,
Source channels 1 to be tested to source channels 48 to be tested is the test signal accessing multichannel each passage of correlator to be tested.
(4) the 48 road source channels to be tested obtained are delivered to digital correlator to be tested respectively, obtain the to be tested of actual measurement
The each interchannel complex correlation value of digital correlator, and then each passage of multi-channel digital correlator obtaining the actual measurement shown in Fig. 5 is multiple
Correlation table, wherein, Fig. 5 contrasts for convenience and have chosen a kind of passage ranks arrangement mode, and other ranks can be selected to arrange
Mode.
(5) point intended each interchannel complex correlation value of digital correlator to be tested of situation calculating is:
If two source channels to be tested are respectively noise a-signal merit sub-signal to be measured, noise B signal merit to be measured divides letter
Number, then intended complex correlation value range value | ρAB| for
Intended complex correlation value phase place is θ1；
If two source channels to be tested are respectively noise B signal merit sub-signal to be measured, noise C signal merit to be measured divides letter
Number, then intended complex correlation value range value | ρBC| for
Intended complex correlation value phase place is θ2；
If two source channels to be tested are respectively noise a-signal merit sub-signal to be measured, noise C signal merit to be measured divides letter
Number, then intended complex correlation value range value | ρAC|=0, it is contemplated that complex correlation value phase place be 0, travel through digital correlator to be tested each
Passage, obtains the intended each interchannel complex correlation value of digital correlator to be tested, and then obtains the intended manifold shown in Fig. 5
Road digital correlator each passage complex correlation value table.
(6) by each complex correlation value in each interchannel complex correlation value table of multi-channel digital correlator of actual measurement with pre-
During multi-channel digital correlator each passage complex correlation value table of phase is whole, corresponding complex correlation value compares, and finally gives manifold to be tested
Road digital correlator measuring accuracy also completes to judge.Wherein, multi-channel digital correlator measuring accuracy to be tested calculates, judges bag
Include following steps:
(7) choose two passages, calculate the complex correlation value when the first two passage of actual measurement, intended when the first two passage
The difference of complex correlation value, then obtains when the precision of the first two passage；
(8) travel through all passages in digital correlator to be tested, obtain the precision of any two passage, when number to be tested
The phase place of word correlator two passage precision is not less than 1, when the range value of two passage precision is not more than 0.99, digital correlation to be tested
Current two passages of device can be used, and current two passages of digital correlator the most to be tested are unavailable.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (6)
1. a multi-channel digital correlator performance test methods, it is characterised in that comprise the steps:
(1) produce the uncorrelated noise signal of two-way, and be designated as the first noise signal, the second noise signal respectively, then by the
One noise signal obtains merit and divides a signal, merit to divide b signal after carrying out merit divisional processing, the second noise signal is carried out merit divisional processing and obtains
C signal and merit is divided to divide d signal to merit；
(2) merit is divided a signal deliver to the first phase shifter carry out phase shift process after obtain noise a-signal to be measured, divide c signal to send merit
Obtaining noise C signal to be measured after carrying out phase shift process to the second phase shifter, wherein, the phase shift value of the first phase shifter is θ1, first
The phase shift value of phase shifter is θ2, θ1≠θ2, θ1、θ2>0；
(3) merit is divided b signal deliver to the first adjustable attenuator carry out attenuation processing and obtain P1 signal, merit is divided d signal deliver to
Two adjustable attenuators obtain P2 signal after carrying out attenuation processing, obtain noise B to be measured after carrying out P1 and P2 signal closing road process
Signal, wherein, the attenuation of the first adjustable attenuator is all higher than 0 with the attenuation of the second adjustable attenuator and differs, and P1 believes
Number power be P1, the power of P2 signal is P2；
(4) attenuation of the first adjustable attenuator is regulated with the attenuation of the second adjustable attenuator until noise A to be measured, to be measured making an uproar
Sound B, the signal power of noise C to be measured are P, wherein, and P=P1+P2；
(5) noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured are carried out merit divisional processing respectively, obtain multichannel and treat
Test source passage also delivers to digital correlator to be tested respectively, obtains each interchannel complex phase of digital correlator to be tested of actual measurement
Pass is worth；Described source channels to be tested is noise a-signal to be measured, noise B signal to be measured or noise C signal merit divisional processing to be measured
The test signal obtained；
(6) calculating the intended each interchannel complex correlation value of digital correlator to be tested is:
If two source channels to be tested are respectively noise a-signal merit sub-signal to be measured, noise B signal merit sub-signal to be measured, then
Intended complex correlation value range value | ρAB| for
Intended complex correlation value phase place is θ1；
If two source channels to be tested are respectively noise B signal merit sub-signal to be measured, noise C signal merit sub-signal to be measured, then
Intended complex correlation value range value | ρBC| for
Intended complex correlation value phase place is θ2；
If two source channels to be tested are respectively noise a-signal merit sub-signal to be measured, noise C signal merit sub-signal to be measured, then
Intended complex correlation value range value | ρAC|=0, it is contemplated that complex correlation value phase place be 0；Travel through each passage of digital correlator to be tested,
Obtain the intended each interchannel complex correlation value of digital correlator to be tested；
(7) each interchannel complex correlation value of digital correlator to be tested, intended digital correlator to be tested according to actual measurement are each
Interchannel complex correlation value is calculated each interchannel precision of digital correlator to be tested；
(8) when the phase place of digital correlator two passage precision to be tested is not less than 1, and the range value of two passage precision is not more than 0.99
Time, current two passages of digital correlator to be tested can use, and current two passages of digital correlator the most to be tested are unavailable.
A kind of multi-channel digital correlator performance test methods the most according to claim 1, it is characterised in that: described root
The each interchannel complex correlation value of digital correlator to be tested surveyed factually, intended digital correlator to be tested are each interchannel multiple
Correlation value calculation obtains the method for each interchannel precision of digital correlator to be tested and comprises the steps:
(1) arbitrarily choose two passages, calculate the complex correlation value when the first two passage of actual measurement, intended when the first two passage
The difference of complex correlation value, and then obtain when the precision of the first two passage；
(2) travel through all passages in digital correlator to be tested, obtain the precision of any two passage.
A kind of multi-channel digital correlator performance test methods the most according to claim 1 and 2, it is characterised in that: described
Step (1) in the bandwidth of noise signal be limited.
A kind of multi-channel digital correlator performance test methods the most according to claim 1 and 2, it is characterised in that: described
Noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured are carried out merit divisional processing respectively, obtain multichannel to be tested
Source channels is also delivered to the method for digital correlator to be tested respectively and is comprised the steps:
(1) noise a-signal to be measured, noise B signal to be measured, noise C signal to be measured are delivered to switch matrix；
(2) Guan Bi controlling switch matrix breaker in middle makes noise a-signal to be measured, noise B signal to be measured, noise C to be measured letter
Number can deliver to the 4th power splitter, the 5th power splitter, the 6th power splitter respectively, wherein, the 4th power splitter, the 5th power splitter,
The digital correlator passage to be tested that six power splitters connect is different；
(3) the 4th power splitter, the 5th power splitter, the 6th power splitter are controlled to the noise a-signal to be measured of input, noise B to be measured letter
Number or noise C signal to be measured carry out merit divisional processing, obtain multichannel source channels to be tested and respectively deliver to connect number to be tested
Word correlator channel.
A kind of multi-channel digital correlator performance test methods the most according to claim 1 and 2, it is characterised in that: described
Four power splitters, the 5th power splitter, the 6th power splitter be one point 16, digital correlator to be tested is 48 paths.
A kind of multi-channel digital correlator performance test methods the most according to claim 4, it is characterised in that: described opens
Close matrix and include six kinds of mode of communicating.
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| CN110231516A (en) * | 2019-06-14 | 2019-09-13 | 北京无线电计量测试研究所 | A kind of quick temperature-changeable microwave noise source |
| CN110474695A (en) * | 2019-08-21 | 2019-11-19 | 国家卫星气象中心(国家空间天气监测预警中心) | A kind of inspection and optimization method suitable for microwave radiometer interchannel energy mutual interference |
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| 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 |
| CN114710138A (en) * | 2022-06-08 | 2022-07-05 | 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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