基于OTHR的无源雷达系统及其关键技术

提出了一种利用天波超视距雷达照射作为外辐射源，舰载雷达接收海面回波来进行海面舰船和低空飞机等目标探测的无源探测系统。该系统可以对海面舰船、低空飞机等目标进行有效探测。文中着重分析了该雷达系统中可能存在的问题，如同步信号的获取，电离层反射带来的多径干扰抑制，阵元的幅相误差、舰船运动造成的导向矢量约束误差对天线阵列波束形成性能的影响，并给出了解决方案。仿真结果表明方法是行之有效的。

A New Passive Radar System Based on OTHR and Shipboard Radar and Its Key Technologies

This paper presents a new passive radar system, which uses OTHR as its external illuminator and shipboard radar as its receiver. The system can effectively detect targets as ships and low altitude airplanes. The existing problems in this system are discussed, such as how to get the synchronizing signal, how to reject the multi-path interference caused by ionospheric reflection, the steering vector mismatch caused by the array amplitude-phase errors and shipmotion. Some beamforming methods are given to resolve these problems and the simulation results show that the methods are effective.