主动声纳直达波干扰抑制的盲分离算法

针对舰艇编队作战中主动声纳之间存在的强直达波干扰，提出了一种基于信号统计二阶矩的直达波干扰抑制算法，实现了强干扰背景下的微弱目标回波检测。这种方法将盲分离理论和匹配相关技术相结合，首先对接收数据进行直达波干扰抑制，再利用已知发射信号副本进行匹配相关，最后提取目标回波信号。相比其它强干扰抑制算法，特别是高阶累计量法，该算法具有计算复杂度低的优点。通过数值仿真实验表明：该算法能够对直达波干扰进行有效抑制，对目标回波的检测性能优于直接匹配相关方法。

A blind source separation approach to active sonar's direct path interference suppression

The suppression of direct path interference （DPI） between active sonars in fleet formation is considered. An approach based on second order cumulate statistics is proposed to detecting weak targets＇ echoes in presence of strong jamming. The method combines blind source separation and matched filter processing technology. First, the blind source separation is applied to the received signal. Secondly, the output of DPI suppression is correlated with a replica of the transmitted pulse. Finally, the target echo is extracted and DPI is eliminated. Compared with other strong jamming algorithms, especially the high-order cumulate method, the proposed method significantly reduces computational complexity. Numerical experiments prove that the proposed algorithm greatly outperforms the conventional method of replica correlator in the presence of strong DPI.