Method for correcting uncertainty of independent component analytical method in electromagnetic interference separation
An independent component and electromagnetic interference technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the uncertainty of the amplitude of the separation electromagnetic interference results, the separation results cannot truly reflect the electromagnetic interference amplitude value, and cannot truly reflect the electromagnetic interference Phase information and other issues to achieve the effect of ensuring accurate quantitative analysis and correction results
Active Publication Date: 2013-07-10
BEIHANG UNIV
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Phase uncertainty refers to the difference in phase between the electromagnetic interference and the original interference after separation, and the separation result cannot truly reflect the phase information of the electromagnetic interference, so the separation result cannot be used for quantitative analysis of the electromagnetic interference test
[0005] 2. There is uncertainty in the magnitude of the separation of electromagnetic interference results
Amplitude uncertainty refers to the difference in amplitude between the electromagnetic interference and the original interference after separation, and the separation result cannot truly reflect the amplitude value of the electromagnetic interference, so the separation result cannot be used for quantitative analysis of the electromagnetic interference test
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[0049] In the experiment, a sine signal, an amplitude modulation signal and a frequency modulation signal were randomly mixed by using matlab7.0 software to simulate the actual measurement signal, referred to as the actual measurement signal. The measured signal and the results obtained after using the independent component analysis method are as follows: figure 2 As shown in (A) and (B) in , there are uncertainties in magnitude and phase. The three signal expressions are as follows:
[0050] I 1 =(1+cos(2πf 1 t))cos(2πf 10 t)
[0051] I 2 =cos(2πf 20 t+cos(2πf 2 t))
[0052] I 3 =sin(2πf 20 t)
[0053] where f 1 = 10MHz, f 10 =115MHz, f 2 =12MHz, f 20 =130MHz. t means time.
[0054] Step 1. Phase recovery. The mixed estimate matrix output by independent component analysis is:
[0055] A M × N = 0.4296 ...
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The invention provides a method for correcting uncertainty of an independent component analytical method in electromagnetic interference separation, wherein the method is used for the field of electromagnetic interference separation. The method includes the steps that the phase position of an independent separation signal matrix is regulated according to mixed estimation of plus or minus characteristics of each row of the matrix, and all actual measurement signals with correlation coefficients of independent separation signals and the maximal actual measurement signal are searched; new independent separation signals FS are obtained through transform domain processing; feature frequency points of the independent separation signals are searched in a certain step length; according to the feature frequency points, the energy proportionality coefficient between current independent separation signals and the maximal actual measurement signal is determined, and the independent separation signals in a new frequency domain are obtained; and Fourier inversion is carried out on the independent separation signals in the new frequency domain, and correction signals are rejected. The method corrects phase positions and amplitude values of the independent electromagnetic interference separation signals based on an independent component analysis, is precise in correction result, and can be used for quantitative analyses of electromagnetic interference tests.
Description
technical field [0001] The invention relates to the field of electromagnetic interference separation, in particular to a method for correcting the uncertainty of an independent component analysis method in electromagnetic interference separation. Background technique [0002] In the electromagnetic compatibility test, according to the national military standard GJB151A-97 "Military Equipment and Subsystem Electromagnetic Emission and Sensitivity Requirements", the electromagnetic compatibility test includes electromagnetic interference (EMI) test, and the electromagnetic interference test includes conducted emission and radiated emission test . The national military standard clearly stipulates the limit value of equipment radiation, that is, the limit value of electromagnetic interference that can be tolerated. In the electromagnetic compatibility test, the signal that can be measured is a mixed signal of multiple electromagnetic interference and background noise. Therefor...
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IPC IPC(8): G01R31/00
Inventor 潘耀鹏陶志杰戴飞李柏超
Owner BEIHANG UNIV
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