GPS辐射源的无源雷达两级干扰抑制方法

为了解决回波通道内的干扰抑制问题,根据基于GPS辐射源无源雷达的特点,提出了一种ECA与CLEAN相结合的两级干扰抑制方法,即第1级采用ECA消除直达波干扰和多径干扰,第2级采用CLEAN算法迭代地消除强目标回波旁瓣干扰.该方法可以全面地抑制回波通道内的干扰,并且无需估计干扰参数,有效避免了干扰参数估计误差引起的抑制性能下降.仿真结果表明了该方法的有效性.

A two-stage disturbance cancellation method for GPS based passive radar

As a new radar detective system,passive radar which is based on a GPS illuminator is attracting increasing attention.The method of suppressing interference in the echo channel is a key point due to the weak GPS scattered signals.According to the character of the passive radar based on GPS,a two-stage disturbance cancellation method combining ECA and CLEAN was proposed to suppress the interference.In the first stage,ECA was used to remove the direct-path and multi-path interference.In the second stage,the CLEAN algorithm was used to iteratively suppress the side-lobe interference of the strong target echo.The method can effectively restrain disturbance in the channel without estimation of the disturbance parameter,thereby avoiding reduction of the restraint performance caused by the disturbance parameter estimation error.Its effectiveness is demonstrated with the simulation results.