基于自适应分数延迟估计的FM广播辐射源雷达直达波对消

Direct-Path Cancellation to FM Broadcast Transmitter 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。该文首先对基于FM广播辐射源的双基地雷达中的直达波干扰进行了分析;然后提出了基于自适应分数延迟估计直达波干扰抑制算法;最后给出了基于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 direct-path interference. Conventional solutions to this problem is the use of an adaptive antenna, steering null towards the interference. Unfortunately the null depth obtained by this technology is not enough for surveillance radar. First of all, direct-path interference appeared in bistatic radar based on FM broadcast transmitter is analyzed in the paper; Secondly, a solution based on adaptive fractional delay estimation is introduced how to deal with this problem; Finally, a bistatic radar experimental system based on FM broadcast transmitter is discussed. Simulation results with real collected data show applying the method has better the performance of target detection.