基于精确时延估计的无源雷达回波提纯方法  

A New Method of Echo Purification in Passive Radar Based on Accurate Time Delay Estimation

作　　者：卢宏超[1] 刘畅畅[1] 王天云[1] 陈卫东[1] 

机构地区：[1]中国科学技术大学中国科学院电磁空间信息重点实验室,合肥230027

出　　处：《现代雷达》2014年第7期24-29,共6页Modern Radar

基　　金：国家自然科学基金资助项目(61172155)

摘　　要：基于外辐射源的连续波无源雷达系统中,目标回波信号通常被淹没在强直达波和多径杂波干扰中。现有的直达波和多径杂波干扰抑制方法都是在假设信号时延处于整数倍的采样间隔条件下进行处理的,而实际信号的延时不可能都恰好处于整数倍的采样周期上。为解决信号时延不在整数倍的采样周期上的分数延时问题,文中提出了一种基于精确时延估计的参数估计方法,来对消目标回波接收通道中的直达波和多径杂波干扰,并对其参数估计性能和杂波抑制性能进行了分析。理论与仿真结果表明,在分数时延条件下新方法的杂波抑制性能远远优于传统的自适应滤波方法和广义对消算法方法。It is a problem in passive radar that direct signal and muhipath clutter are much stronger than target echoes. Existing methods for direct signal and times clutter cancellation are usually based on the assumption that the arrival time of clutter is integer times of sampling period, which is impossible for real system. A novel method using accurate time-delay estimation for clutter cancellation is proposed in this paper, and the performance of parameter estimation and clutter suppression are both analyzed. Theoretical and simulated results are provided to demonstrate that the proposed method is more effective than adaptive cancellation and ECA methods under fractional time-delay.

关 键 词：无源雷达 时延估计 杂波抑制 

分 类 号：TN958[电子电信—信号与信息处理]