Reverberation suppression based on FrFT in the detection of targets on the seabed for moving sonar

A method for reverberation suppression based on fractional Fourier transform was brought up to detect targets on the seabed for moving sonar. The emission signal was reconstructed by measuring the velocity of sonar. The optimum fractional order and the position of narrow band filter were calculated though reconstructed signal. Reverberation noise containing target echo was transformed to fractional Fourier domain and filter by narrow band filter, and then we can recover target echo and filter out reverberation noise through inverse fractional Fourier transform. The results show that the method, can effectively suppress reverberation noise.