Method for noise abatement of LFM underwater sound multi-path signals
A noise suppression and signal technology, applied in the field of signal processing, can solve the problems of signal waveform error, effective suppression of in-band noise, unsuitable for LFM underwater acoustic multi-channel signal noise suppression processing, etc., to achieve small calculation and suppress in-band noise composition, the effect of improving the signal-to-noise ratio
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[0035] The specific embodiment of the present invention will be described in more detail below in conjunction with the accompanying drawings.
[0036] The present invention relates to a noise suppression method for LFM underwater acoustic multi-channel signal, the algorithm flow of method realization is as follows figure 1 As shown, the whole process is decomposed into the following 6 steps to complete:
[0037] Step (1) calculates the optimum fractional Fourier transform order according to the formula α=arctank+π / 2 by known LFM signal parameter, is used for the optimal fractional Fourier transform of LFM underwater acoustic multi-channel signal, wherein k is the frequency change rate of the LFM signal;
[0038] Step (2) carrying out band-pass filtering preprocessing to the underwater acoustic multi-channel signal, filtering out the noise components outside the operating frequency band of the system, which can achieve the purpose of suppressing the in-band noise of the u-doma...
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