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

A mixed-signal and electromagnetic interference technology, applied in the measurement of electricity, measuring electrical variables, measuring devices, etc., can solve the problem of low electromagnetic interference test accuracy, limited effect of blind source separation of electromagnetic interference mixed signals, and inability to collect electromagnetic interference mixed signals Time information and other issues to achieve the effect of improving separation speed and separation accuracy

Active Publication Date: 2015-05-20
BEIHANG UNIV
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Problems solved by technology

[0006] The present invention aims at collecting the time information of the electromagnetic interference mixed signal when the measurement receiver is used to collect the electromagnetic interference mixed signal in the current electromagnetic radiation emission test, so that the effect of blind source separation on the electromagnetic interference mixed signal is limited, and the accuracy of the electromagnetic interference test is not good. High problem, providing a method based on signal difference to improve blind source separation of radiated EMI mixed signals

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

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Embodiment

[0042] The method of the present invention is tested and verified with three radiated electromagnetic interference sources. Three sources of radiated EMI, one is an amplitude modulated signal s 1 , one is the frequency modulated signal s 2 , one is the pulse modulation signal s 3 . Among them, the amplitude modulation signal s 1 The fundamental carrier frequency is f 1 =800MHz, modulation frequency is f mod1 =9MHz, modulation depth is 80%; frequency modulation signal s 2 The fundamental carrier frequency is f 2 =620MHz, the modulation frequency is f mod2 =7MHz; pulse modulation signal s 3 The fundamental carrier frequency is f 3 =340MHz, the modulation frequency is f mod3 = 10MHz. The waveforms of the three signals are as follows figure 2 As shown, the mathematical expression is:

[0043] the s 1 =[1+0.8sin(2πf mod1 t)] sin(2πf 1 t)

[0044] f 1 =800MHz, f mod1 =9MHz;

[0045] the s 2 =cos[2πf 2 t+2cos(2πf mod2 t)]

[0046] f 2 =620MHz,f mod2 =7MHz; ...

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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

technical field [0001] The invention relates to the field of electromagnetic compatibility testing, in particular to a method for improving blind source separation of radiated electromagnetic interference mixed signals based on signal difference. Background technique [0002] According to the provisions of GJB151A-97 "Electromagnetic Emission and Sensitivity Requirements for Military Equipment and Subsystems", electromagnetic compatibility testing is divided into two parts: electromagnetic interference (EMI) testing and electromagnetic susceptibility (EMS) testing, of which electromagnetic interference testing is divided into conduction There are two parts of emission test and radiation emission test. Among them, the conduction emission test examines the interference signals that exist on the AC and DC power lines and are generated by the tested product, while the radiated emission test examines the signal emitted by the device under test through space. Radiation emission t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 戴飞李柏超陶志杰林健
Owner BEIHANG UNIV
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