一种改进的被动雷达直达干扰抑制方案

An improved interference cancellation scheme for passive radar

研究被动雷达系统中直达信号干扰的抑制问题.针对实际场景中系统主通道与参考通道之间存在频域与时域上的链路差异,提出一种改进的直达干扰抑制方案.利用最大似然原理对参考通道与主通道的频差进行补偿,使用分层搜索的方法降低算法复杂度,进而基于解卷积的算法对时域失真进行恢复.仿真结果显示,与现有方案相比,所提出方案能够克服通道链路差异带来的不利影响,精确重构出主通道中的直达干扰信号,实现更佳的干扰抑制效果,具有很好的实用价值.

In this paper, direct path interference cancellation for a passive radar system is investigated. A new cancellation scheme is proposed to address inevitable hardware discrepancy between the surveillance channel and the reference channel.In the proposed scheme, firstly, the frequency deviation between the two channels is reduced based on the maximum likelihood principle, and the hierarchical search method is used to reduce the complexity, then the distortion in time domain is compensated via a de-convolutional algorithm. The numerical results show that, the proposed scheme can effectively compensate the discrepancy between the two channels and reconstruct the direct interference signals in the surveillance channel accurately, which can improve the interference cancellation performance and is attractive in practical scenarios.