基于局部搜索的机载外辐射源干扰抑制算法  

Interference suppression algorithm based on local search in airborne passive radar

作　　者：邓亚琦 张赛文 李稳国 肖卫初[3] DENG Yaqi;ZHANG Saiwen;LI Wenguo;XIAO Weichu(College of Information and Electronic Engineering,Hunan City University,Yiyang 413000,China;All-Solid-State Energy Storage Materials and Devices Key Laboratory of Hunan Province,Hunan City University,Yiyang 413000,China;College of Electrical and Information Engineering,Hunan University,Changsha 410000,China)

机构地区：[1]湖南城市学院信息与电子工程学院,益阳413000 [2]湖南城市学院全固态储能材料与器件湖南省重点实验室,益阳413000 [3]湖南大学电气与信息工程学院,长沙410000

出　　处：《电波科学学报》2022年第5期824-830,共7页Chinese Journal of Radio Science

基　　金：湖南省自然科学基金青年基金(2021JJ40029);湖南省教育厅科学研究项目青年项目(21B0710)。

摘　　要：在机载外辐射源雷达不纯净参考信号条件下,参考通道中的多径与回波匹配得到的干扰将降低空时自适应处理的目标检测能力,而网格失配问题严重影响了干扰的估计性能.本文针对网格失配下的机载外辐射源干扰抑制问题,提出一种基于局部搜索的干扰估计算法.该算法在干扰稀疏观测模型的基础上构建全局距离-多普勒字典,从中选择与干扰相匹配的全局网格点;然后以该全局网格点为中心,对多普勒平面精细划分来构建局部多普勒字典,并选择与干扰更匹配的局部网格点;最后估计干扰的距离-多普勒像以实现干扰抑制,克服不纯净参考信号的影响.仿真结果表明,所提算法可降低网格失配导致的抑制性能损失,有效提高不纯净参考信号下空时处理的目标检测能力.Considering an impure reference signal in airborne passive radar systems,the interference,which is the matched result of scatterer echoes with multipath in the reference channel,degrades the target detection ability of spacetime adaptive processing(STAP).In addition,the off-grid effects seriously affect the interference estimation performance.Aiming at the interference suppression problem in airborne passive radar with off-grids effects,an interference suppression method based on local search is proposed in this paper.The algorithm builds a global rangeDoppler dictionary based on the interference sparse measurement model,from which a global grid point matching the interference is selected.Then,the global grid point is used as the center to finely divide the Doppler plane and construct a local Doppler dictionary,and the local grid point that is more suitable for the interference is selected.Finally,the range-Doppler image of the interference is estimated to achieve interference suppression and overcome the influence of impure reference signals on the STAP algorithm.The simulation results show that the proposed algorithm can reduce the loss of suppression performance caused by off-grid effects and improve the target detection ability of space-time adaptive processing with impure reference signals.

关 键 词：机载雷达 外辐射源雷达 不纯净参考信号 网格失配 局部搜索 

分 类 号：TN958.97[电子电信—信号与信息处理]