CN103018598B - Method for improving radiating electromagnetic interference mixed signal blind source separation on basis of signal difference - Google Patents

Method for improving radiating electromagnetic interference mixed signal blind source separation on basis of signal difference Download PDF

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CN103018598B
CN103018598B CN201210505812.2A CN201210505812A CN103018598B CN 103018598 B CN103018598 B CN 103018598B CN 201210505812 A CN201210505812 A CN 201210505812A CN 103018598 B CN103018598 B CN 103018598B
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electromagnetic interference
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emi
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CN103018598A (en
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戴飞
李柏超
陶志杰
林健
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Beihang University
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Abstract

The invention provides a method for improving radiating electromagnetic interference mixed signal blind source separation on the basis of signal difference and is applied to the field of electromagnetic compatibility testing. According to the method, background noise is independently tested at each testing position, radiated emission testing is performed on tested objects at each testing position, test signals for testing the background noise and the tested objects are processed through a self-adapting filter so that electromagnetic interference mixed signals emitted by the tested objects are obtained, then difference processing is performed on a signal matrix composed of the obtained electromagnetic interference mixed signal so as to obtain a new signal matrix, and an independent component analysis method is utilized to perform blind source separation on the obtained new signal matrix. According to the method, the blind source separation effects of the radiating electromagnetic interference signals are improved, separating accuracy is improved, and the separation speed for the electromagnetic interference signal blind source separation is further improved.

Description

The method of Radiative EMI mixed signal blind source separating is improved based on signal difference
Technical field
The present invention relates to electromagnetic compatibility test field, be specifically related to a kind of method improving Radiative EMI mixed signal blind source separating based on signal difference.
Background technology
According to the regulation of GJB151A-97 " military equipment and subsystem Electromagnetic Launching and susceptibility require ", electromagnetic compatibility test is divided into electromagnetic interference (EMI) to test and electromagnetic susceptibility (EMS) tests two large divisions, and wherein Electromagnetic Interference Test is divided into again conduction transmitting test and radiation-emitting to test two parts.Wherein conduction transmitting test investigates undesired signal that exist on AC and DC power supply line, that produced by test specimen, and radiation-emitting experiment investigation equipment under test is through the signal of spatial emission.That certain parts, antenna, cable or web member that radiation-emitting test refers in test specimen radiate, by the intentional or unintentional electromagnetic energy of spatial.
As shown in Figure 1, existing electromagnetic radiation test macro is generally made up of receiving antenna, measuring receiver and data recording equipment.In system, receiving antenna is used for receiving electromagnetic radiation interference voltage, measuring receiver is used for the electromagnetic interference voltage that receiving antenna receives on the one hand, being modified to corresponding electric field intensity to the electromagnetic interference voltage received through antenna factor exports to data recording equipment on the other hand, and data recording equipment is for recording data sequence.
For having, interference source signal type is unknown, number is unknown, the Radiative EMI source of the unknown feature of hybrid mode, and existing radiation test is faced with larger difficulty.And blind source separating theory has without the need to knowing source signal, without the need to knowing source signal hybrid mode, only can isolate the feature of source signal from mixed test signal, this extremely mates with the Electromagnetic Interference Test problem of this type of source signal.Therefore the Radiative EMI test problem selecting blind source separating theory to solve exist actually is very suitable.And in blind source separating theory, independent component analysis method uses more method.
When using measuring receiver to gather electromagnetic interference (EMI) mixed signal, cannot gather the temporal information of electromagnetic interference (EMI) mixed signal, this makes existing means of testing to the blind source separating limited efficiency of electromagnetic interference (EMI) mixed signal, and the accuracy of Electromagnetic Interference Test is not ideal enough.
Summary of the invention
The present invention is directed to current electromagnetic radiation test in use measuring receiver gather electromagnetic interference (EMI) mixed signal time, the temporal information of electromagnetic interference (EMI) mixed signal cannot be gathered, make the blind source separating limited efficiency to electromagnetic interference (EMI) mixed signal, the problem that the accuracy of Electromagnetic Interference Test is not high, provides a kind of method improving Radiative EMI mixed signal blind source separating based on signal difference.
A kind of method improving Radiative EMI mixed signal blind source separating based on signal difference provided by the invention, comprises the steps:
Step one: arrange M test position in the test space, for placing receiving antenna, to receive the electromagnetic interference (EMI) mixed signal of radiation in space; Aerial position requires setting apart from the distance of test specimen according to respective standard;
Step 2: first, tests ground unrest at each test position, at the ambient noise signal of i-th test position test is then, at each test position, radiation emission test is carried out to test specimen, in the mixed signal of i-th test position test be a ithe electromagnetic interference (EMI) mixed signal of launching for test specimen itself and the mixed signal of ambient noise signal;
Step 3: with a i(i=1,2 ..., M) and n i(i=1,2 ... M) be reference quantity input adaptive wave filter, utilize the ambient noise signal in mixed signal and separately test the ambient noise signal obtained and there is correlativity, the ambient noise signal in filtering mixed signal, obtain the electromagnetic interference (EMI) mixed signal x of test specimen its own transmission i(i=1,2 ..., M);
Step 4: the electromagnetic interference (EMI) mixed signal of each test position after filter out background noise signal is combined into confederate matrix X=[x 1, x 2x m] t;
Step 5: build signal difference matrix difference process is carried out to confederate matrix X, obtains new matrix Z=BX.
Step 6: take Z as electromagnetic interference (EMI) mixed signal matrix, utilize independent component analysis method to do blind source separating.
Advantage of the present invention and good effect are:
(1) do not change test signal character, between each group of test signal, mined information is to improve separating effect;
(2) change Weak Information in reduction signal, highlight in signal and change violent information, improve the separation accuracy of electromagnetic interference (EMI) mixed signal blind source separating;
(3) velocity of separation of electromagnetic interference (EMI) mixed signal blind source separating is improved.
Accompanying drawing explanation
Fig. 1 is the structural representation of conventional electromagnetic radiation emission test system;
Fig. 2 is three emitter Signals oscillograms in the embodiment of the present invention;
Fig. 3 surveys test site schematic layout pattern in the embodiment of the present invention;
Fig. 4 is the mixed waveform signal figure surveying lower 5 positions in the embodiment of the present invention;
Fig. 5 is the signal waveforms after surveying lower 5 position filter out background noise in the embodiment of the present invention;
Fig. 6 surveys the signal waveforms after lower 5 position difference process in the embodiment of the present invention;
Fig. 7 is that in the embodiment of the present invention, the lower difference of actual measurement directly processes the signal waveforms with difference aftertreatment;
Fig. 8 is the process flow diagram that the present invention improves Radiative EMI mixed signal blind source separation method.
Embodiment
Below in conjunction with accompanying drawing, method of the present invention is described in detail.
The inventive method, pre-service is carried out to the multiposition electromagnetic interference (EMI) mixed signal collected, blind source separating effect for spectrum signal is improved, improves the accuracy of Electromagnetic Interference Test, for more solid foundation has been established in the exceed standard investigation of equipment and the rectification of further electromagnetic interference (EMI).Time in electromagnetic compatibility radiation emission test to undesired signal blind source separating, through carrying out pre-service to mixing undesired signal thus improve the method for whole separation effect, the method is after obtaining multipoint electromagnetism mixing undesired signal, filter out background noise, then according to the principle conversion of mixed signal row matrix not being changed to signal properties, line translation is carried out to realize the difference process of each position signal to mixing undesired signal matrix, thus improves the separating effect of electromagnetic interference (EMI) mixed signal blind source separating.
A kind of method improving Radiative EMI mixed signal blind source separating based on signal difference provided by the invention, as shown in Figure 8, has following steps:
Step one: M point places receiving antenna to receive the electromagnetic interference (EMI) mixed signal of radiation in space in the test space.Aerial position requires setting apart from the distance of test specimen according to respective standard.
The disposing way of test specimen, antenna, measuring receiver and data sink as shown in Figure 1.In actual test, can, when predefined test position, common antenna be used to test in certain sequence at diverse location.
Step 2: first test ground unrest at each test position, is designated as at the ground unrest of i-th test position test again radiation emission test is carried out to test specimen, be designated as a in the mixed signal of i-th test position test i(i=1,2 ..., M), test signal a ithe electromagnetic interference (EMI) mixed signal of launching for test specimen itself and the mixed signal of ground unrest.
Above twice test all needs to carry out according to corresponding electromagnetic compatibility test standard.
Step 3: with a i(i=1,2 ..., M) and n i(i=1,2 ... M) be reference quantity input adaptive wave filter, utilize the ground unrest in mixed signal and the feature of testing separately the correlativity that the ground unrest that obtains has, the ground unrest in filtering mixed signal, obtains the electromagnetic interference (EMI) mixed signal x of test specimen its own transmission i(i=1,2 ..., M).
Various types of ground unrest under utilization the method filtering test environment, eliminates ground unrest the impact of test result, ensures the accuracy of test result.Auto adapted filtering when statistical property the unknown of input process or change, by adjusting the parameter of oneself, can reach the requirement of certain optimum criterion.In the present invention, adopt auto adapted filtering to use lowest mean square criterion, namely as the mixed signal a containing ground unrest i(i=1,2 ..., M) and test the ground unrest n obtained separately i(i=1,2 ..., M) between LMS least mean square minimum time, achieve and noise farthest suppressed.
Step 4: the electromagnetic interference (EMI) mixed signal of each test position after filter out background noise is combined into confederate matrix X=[x 1, x 2..., x m] t.
Measuring receiver collects the electromagnetic interference (EMI) mixed signal frequency spectrum data of each position by sweep method, is designated as x respectively 1, x 2x m.By the electromagnetic interference (EMI) mixed signal frequency spectrum data x of each position 1, x 2x mbe combined into confederate matrix X=[x 1, x 2x m] t, then the electromagnetic interference (EMI) mixed signal frequency spectrum data of each behavior position of confederate matrix X.If N number of electromagnetic interference (EMI) source signal is s 1, s 2s n, source signal matrix is S=[s 1, s 2s n] t.Then X=AS, wherein A is M × N rank electromagnetic interference (EMI) source signal hybrid matrix, and this hybrid matrix represents the unknown hybrid mode of each electromagnetic interference (EMI) source signal in space.If separation matrix is W, the object of blind source separating is solution matrix W, makes Output rusults matrix Y=WX=WAS, and so Y is exactly being similar to source signal S, thus reaches the object of separation.
Step 5: due to test signal X=[x 1, x 2x m] tdo line translation, can not signal properties be changed.Therefore build signal difference matrix to mixed signal x 1, x 2x mcarry out difference process, obtain new matrix Z=BX.If W' is separation matrix Z being carried out to blind source separating, then Z is carried out to Output rusults matrix Y '=W ' Z=W ' BX of blind source separating, known Y '=Y, namely result is constant.
Due to the electromagnetic interference (EMI) mixed signal that each behavior of matrix position records, then its line translation is not affected to the character of each position signal.Matrix after line translation is designated as Z=[z 1, z 2z m] t.Z is now equivalent to the signal x to each position in mixed signal confederate matrix 1, x 2x mcarry out difference process, i.e. z 1=x 1-x 2, z 2=x 2-x 3..., z m=x m-x 1.
Step 6: take Z as electromagnetic interference (EMI) mixed signal matrix, utilize independent component analysis method to do blind source separating.
Using the Z matrix that obtains after difference process as electromagnetic interference (EMI) mixed signal Input matrix, utilize independent component analysis method to carry out blind source separating, obtain each electromagnetic interference (EMI) source signal after being separated.
embodiment
With three Radiative EMI sources, actual measurement checking is carried out to the method for the invention.Three Radiative EMI sources, one is am signals s 1, one is frequency modulated signal s 2, one is pulse-modulated signal s 3.Wherein, am signals s 1first-harmonic carrier frequency is f 1=800MHz, modulating frequency is f mod1=9MHz, depth of modulation is 80%; Frequency modulated signal s 2first-harmonic carrier frequency is f 2=620MHz, modulating frequency is f mod2=7MHz; Pulse-modulated signal s 3first-harmonic carrier frequency is f 3=340MHz, modulating frequency is f mod3=10MHz.As shown in Figure 2, mathematic(al) representation is the oscillogram of three signals:
s 1＝[1+0.8sin(2πf mod1t)]·sin(2πf 1t)
f 1＝800MHz，f mod1＝9MHz；
s 2＝cos[2πf 2t+2cos(2πf mod2t)]
f 2＝620MHz，f mod2＝7MHz；
s 3 = Σ n = - ∞ + ∞ [ u ( t + 1 4 f mod 3 + n · 1 f 3 ) - u ( t - 1 4 f mod 3 + n · 1 f 3 ) ]
f 3＝340MHz，f mod3＝10MHz
Adopt the method improving Radiative EMI mixed signal blind source separating based on signal difference of the present invention, carry out following steps:
Step one: diverse location arranges 5 receiving antennas around test specimen, as shown in Figure 3, be the position of receiving antenna and the schematic layout pattern of test specimen, the electromagnetic radiation source in Fig. 3 is exactly test specimen.
Step 2: first test ground unrest at each test position, data are designated as n i(i=1,2 ..., M), then radiation emission test is carried out to test specimen, data are designated as a i(i=1,2 ..., M), this test signal is the mixed signal of the test specimen electromagnetic interference (EMI) mixed signal of launching itself and ground unrest; The mixed waveform signal figure that 5 positions record as shown in Figure 4.
Step 3: with a i(i=1,2 ..., M) and n i(i=1,2 ... M) be reference quantity input adaptive wave filter, utilize the ground unrest in mixed signal and separately test the ground unrest obtained and there is correlativity, the ground unrest in filtering mixed signal, obtain the electromagnetic interference (EMI) mixed signal x of test specimen its own transmission i(i=1,2 ..., M); Oscillogram after 5 position mixed signal filtering noises as shown in Figure 5.
Step 4: the electromagnetic interference (EMI) mixed signal of each test position after filter out background noise is combined into confederate matrix X=[x 1, x 2x m] t.If N number of electromagnetic interference (EMI) source signal is s 1, s 2s n, then source signal composition matrix is: S=[s 1, s 2s n] t.Then X=AS, wherein A is M × N rank electromagnetic interference (EMI) source signal hybrid matrix.If separation matrix is W, then Output rusults matrix is Y=WX=WAS.
Step 5: to test signal X=[x 1, x 2x m] tdo line translation, can not signal properties be changed.Therefore build signal difference matrix make Z=BX, then Y '=W ' Z=W ' BX known Y '=Y, namely result is constant; Each position signal waveforms after embodiment of the present invention difference as shown in Figure 6.
Step 6: take Z as electromagnetic interference (EMI) mixed signal matrix, utilize independent component analysis method to do blind source separating.Utilize independent component analysis method to do blind source separating to the signal matrix X of non-difference process simultaneously.The Comparative result figure be separated in two kinds of situations as shown in Figure 7, wherein shown in (A) is classified as three interference signal sources utilizing independent component analysis method to do blind source separating to obtain to the signal matrix X of non-difference process, and shown in (B) is classified as three interference signal sources utilizing independent component analysis method to do blind source separating to obtain to the signal matrix Z obtained through difference process.Can obviously find out: in actual measurement situation, the inventive method is utilized to be the same with the result utilizing conventional method to obtain, obtain 3 signal sources, and carry out the pretreated effect of signal separation of difference before separation significantly better than without the pretreated signal of difference by the inventive method.Simultaneously, carry out the pretreated Signal separator iterative steps of difference before separation by the inventive method to walk at 9-12, and walk at 12-15 without the Signal separator iterative steps of difference process, the speed as seen by adopting the inventive method to also improve Radiative EMI mixed signal blind source separating.

Claims (2)

1. improve a method for Radiative EMI mixed signal blind source separating based on signal difference, comprise the steps:
Step one: M test position is set in the test space, for placing receiving antenna;
Step 2: first test ground unrest at each test position, at the ambient noise signal of i-th test position test is then carrying out radiation emission test at each test position to test specimen, is a in the mixed signal of i-th test position test i(i=1,2 ..., M), a ithe electromagnetic interference (EMI) mixed signal gone out for test specimen its own transmission and the mixed signal of ambient noise signal;
Step 3: with a i(i=1,2 ..., M) and n i(i=1,2 ..., M) and be reference quantity input adaptive wave filter, the ambient noise signal in filtering mixed signal, obtains the electromagnetic interference (EMI) mixed signal x of test specimen its own transmission i(i=1,2 ..., M);
Step 4: the electromagnetic interference (EMI) mixed signal x that each test position is obtained i(i=1,2 ..., M) and be combined into confederate matrix X=[x 1, x 2x m] t;
It is characterized in that,
Step 5: build signal difference matrix difference process is carried out to confederate matrix X, obtains new matrix Z=BX, matrix Z=[z 1, z 2z m] t, z 1=x 1-x 2, z 2=x 2-x 3..., z m=x m-x 1;
Step 6: with new matrix Z for electromagnetic interference (EMI) mixed signal matrix, utilize independent component analysis method to do blind source separating.
2. the method improving Radiative EMI mixed signal blind source separating based on signal difference according to claim 1, is characterized in that, the sef-adapting filter described in step 3 uses lowest mean square criterion to carry out auto adapted filtering.
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CN113938221B (en) * 2021-10-08 2023-12-29 中国人民解放军陆军工程大学 Anti-interference capability test method for blind source separation module
CN116298651B (en) * 2023-05-17 2023-08-01 广东电网有限责任公司阳江供电局 Fault monitoring method, system, equipment and medium for converter valve power module

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101799494A (en) * 2010-01-29 2010-08-11 南京邮电大学 Soft separation method of conducted electromagnetic interference noise based on blind signal processing technology
CN102075468A (en) * 2011-01-04 2011-05-25 南京大学 Independent components analysis (ICA) blind signal separation method and system based on smoothing function and Parzen window estimation
CN102445650A (en) * 2011-09-22 2012-05-09 重庆大学 Blind signal separation algorithm-based circuit fault diagnosis method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101799494A (en) * 2010-01-29 2010-08-11 南京邮电大学 Soft separation method of conducted electromagnetic interference noise based on blind signal processing technology
CN102075468A (en) * 2011-01-04 2011-05-25 南京大学 Independent components analysis (ICA) blind signal separation method and system based on smoothing function and Parzen window estimation
CN102445650A (en) * 2011-09-22 2012-05-09 重庆大学 Blind signal separation algorithm-based circuit fault diagnosis method

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
《盲信号分离技术研究与算法综述》;周治宇 ;《计算机科学》;20091031;16-20 *
《盲信号分离技术综述》;胡婧;《special Technology》;20100430;64-68 *
何丹丹.《基于快速ICA的电磁辐射信号去噪研究》.《基于快速ICA的电磁辐射信号去噪研究》.2012,第1、2、4章. *

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