基于联合扩展子空间的DTTB无源雷达同频干扰抑制方法研究

Research into Co-frequency Interference Suppression Method of DTTB Passive Radar Based on Joint Extension Subspace

在基于地面数字电视广播(DTTB)信号的无源雷达系统中,由于DTTB采用单频网布站,其接收到的信号不仅存在很强的直达波和多路径杂波,而且不可避免地会收到同道干扰信号。针对回波通道中含有同频干扰的问题,提出了一种基于联合扩展子空间的同频干扰抑制方法。相比较于传统级联同频抑制方法,该方法避免了交叉项之间的互相影响,可有效抑制杂波及同频干扰。理论分析与仿真实验表明,该方法具有良好的干扰抑制性能。

In passive radar system based on digital terrestrial television broadcasting(DTTB)signals,the received signal not only has strong direct wave and multipath clutter but also inevitably has co-channel interference since the DTTB adopts single frequency network station distribution.Aiming at the problem of co-channel interference in the echo channel,this paper proposes a co-frequency interference suppression method based on joint extension subspace.Compared with the traditional cascaded co-frequency suppression method,this method avoids the mutual influence between the cross terms and can effectively suppress the clutter and co-frequency interference.Theoretical analysis and simulation experiments show that this method has good interference suppression performance.