基于自适应分数延迟估计的无源雷达直达波干扰对消方法

Direct Path Cancellation in Passive Radar Based on Adaptive Fractional Delay Estimation

在连续波体制的双基地雷达中一个重要的问题是存在直达波干扰,传统的解决方法是通过自适应天线的干扰置零技术,但这对警戒雷达来说置零的深度有限。本文首先对基于FM广播辐射源的双基地雷达中的直达波干扰进行了分析,然后提出基于自适应分数延迟估计直达波干扰抑制算法,最后给出基于FM广播照射源的一个双基地实验系统。利用该实验系统采集的数据进行仿真,仿真结果验证了该方法的有效性。

One of the major problems in continuous wave bistatic radar is the direct-path interference. Conventional solution to this problem is to use the interference nulling technique in an adaptive antenna, Unfortunately, the null depth obtained by this technology is not enough for surveillance radar. This paper first analyzes the direct path interference appearing in histatic radar based on FM broadcast transmissions, then introduces a solution based on adaptive fractional delay estimation to deal with this problem. Finally an experimental bistatic radar system based on FM broadcast transmission is discussed. Simulation results collected in the radar system show this method has better performance of target detection.