Abstract:

The detection performance of the traditional adaptive coherent detectors in nonstationary sea clutter is limited by the interference of strong sea clutter and the limited coherent integration time. To overcome the limitations, a subband segmented adaptive normalized matched filter (SS-ANMF) detector is proposed. It is composed by a linear phase discrete Fourier transform modulated filter bank and a segmented ANMF detector in each subband. Resorted to the subband decomposition in the frequency domain, the clutter in and out of the band is restricted and the shortterm stationarity of the clutter is enhanced. Besides, by summing over the maximum responses of segmented ANMF of all subbands within a cumulative time, the restriction from the sample size is lifted and the accumulated time is extended. The experimental results using real data show that the SSANMF detector outperforms the compared ones.