Sea clutter suppression and moving target detection method based on clutter map cancellation in frft domain

Abstract

In order to effectively detect moving target in strong sea clutter, a detection algorithm for moving target based on clutter map cancellation in fractional Fourier transform (FRFT) domain is proposed. Radar data in FRFT domain are noncoherently accumulated with the single pole feedback clutter map (SPFB-CM) in FRFT domain, which are used to suppress sea clutter and improve signal to clutter ratio (SCR). X-band real sea clutter of IPIX radar is used for verification and the cell-averaging CFAR (CA-CFAR) in time domain is compared. The results present that weak moving target can be detected in low SCR (SCR=-5dB) environment with high detection probability (P <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</sub> =0.9). The predetermination of the best transform order can be avoided and the poor detection performance of clutter map CFAR in time domain when detecting slow moving target can be improved greatly, which indicates the effectiveness and robustness of the algorithm.