非平稳海杂波背景下子带分段ANMF检测器

针对非平稳海杂波背景下的雷达目标检测问题,传统自适应相干检测器由于强杂波干扰以及相干累积时长的限制而性能表现不佳。为克服这一限制,提出了子带分段自适应归一化匹配滤波检测器(subband segmented adaptive normalized matched filter,SS-ANMF),其由一个线性相位离散傅里叶变换调制滤波器组和每个子带上的分段自适应归一化匹配滤波器(adaptive normalized matched filter,ANMF)检测器构成。在频域上, SS-ANMF检测器通过子带分解技术,不仅抑制了带内外杂波,而且提升了杂波的短期平稳性;在相干累积时段内,通过对分段ANMF在所有子带上的最大响应进行累积求和,实现了有限参考样本下的长时累积。采用实测海杂波数据的实验表明,SS ANMF检测器明显优于对比算法。

Subband segmented ANMF detector in non-stationary sea clutter

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.