Outer radiation source weak signal detection method based on PCA (principal component analysis)
A weak signal detection and external radiation source technology, applied in the field of signal processing, can solve problems such as failure, failure to extract target delay, Doppler frequency parameters, and inability to estimate DOA, etc., to save hardware costs and reduce the amount of calculation Effect
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[0023] The signal processing model of the present invention is as follows:
[0024] The digital modulation signal y(t) received by the array antenna is modeled, and the band-pass signal is mainly processed. Let s(t) represent the continuous modulated signal of the FM broadcast transmitted by a certain radio and television tower, then is the echo signal of the target, where M is the number of elements of the receiving antenna, a 1 ,...,a M Indicates the attenuation of the target echo, τ 1 ,...τ M Indicates the time delay of the target, f 1 ,..., f M Indicates the Doppler frequency shift of the target, then the signal received by the array antenna is y ( t ) = s ( t ) + a 1 s ( t - τ 1 ) ...
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