Frequency domain adaptive matching filter detection method based on FRFT
To solve the problem of the degradation of the detection performance of the frequency domain adaptive matching filter in shallow sea reverberation background,a frequency domain adaptive matching filter detection method based on fractional Fourier transform(FRFT)is proposed.The method uses template matching technology and sliding window to perform the optimal fractional Fourier transform on the received signal.Then,the FRFT domain map obtained in this pro-cess is matched with the FRFT domain map of the reference signal with the optimal order Fourier transform,and the sum of the squares of deviation is used as the index to evaluate the similarity,that is,the position of the minimum sum of the squares of deviation is filtered,and the optimal order fractional inverse Fourier transform is carried out on the filtered signal,so as to realize the target detection under the reverberation background.Simulation results show that the proposed algorithm can sig-nificantly improve the detection performance of the frequency-domain adaptive matching filter when the signal-mixing ratio is-15dB.
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