多路径对无源雷达时差信号测量的影响

Effect of Multi-path on TDOA of the Passive Radar

为了对抗复杂电磁作战环境，无源雷达因其原理及体制上的优势越来越受到重视。作为重要分支的长基线时差定位体制无源雷达，采用多个接收站测量多个时差对空间辐射源进行定位，由于同一辐射源的直达波信号和反射波信号均会进入雷达接收天线，改变接收信号的幅度和相位，造成时差测量误差，降低其定位精度。文中对无源雷达中的多路径效应进行了模型描述和理论分析，针对它对时差检测的影响进行了详细推导和仿真。

To fight against the complex electromagnetic circumstance, increasing attention has been attached to passive radar for its advantages in principle and constitution. As an important branch of passive radar, long baseline time difference of arrival（TDOA） locating radar uses several measurements of TDOA to locate the spatial radiation source. Due to the direct wave and the reflected wave of a radiation source enter the receiving antenna of the passive radar, the amplitude and phase of the received signals will be changed, which will result in the measurement errors of TDOA and deteriorate positioning accuracy. This paper offers a model de- scription and theoretical analysis of the multi-path of passive radar, and also provides the detailed deduction and simulation for its effects on the measurements of TDOA.