基于环境扰动模型的干扰抑制极化滤波器性能研究

摘要

The interference signal in radar main-beam can be suppressed by polarization filter,if the radar has ability of dual-polarization receiving.However,the polarization character of the interference can be disturbed by the real propagation environment like multipath effect.The degree of polarization from the real reception signals can be influenced,as well as the interference suppression performance of the polarization filter.Based on the requirement of the performance analysis of inter-ference suppression polarization filter (ISPF),the math model used to describe the performance of the ISPF is established both in the ideal situation and in the environmental disturbance situation.Combined with the simulation,the performance of ISPF is analyzed with the relationship of interference-noise rate,polarization state of interference and environment coeffi-cient.In order to improve the performance of interference suppression in the environmental disturbance situation, a novel scheme of the main-auxiliary array joint polarization filter ( MAJPF) is proposed.Ultimately,the anti-interference experi-ment is developed to demonstrate the influence of the environment disturbance on the ISPF.Meanwhile,the performances of the two filters are compared based on the environmental disturbance situation.The comparison results show the interference suppression advantage of the novel filter scheme against the disturbance situation.%具有双极化接收能力的雷达利用极化滤波手段能够抑制波束主瓣内的干扰信号。然而多径等传播环境效应会对干扰信号的极化特性产生扰动，影响实际接收信号的极化度，同时影响极化滤波器的干扰抑制性能。本文基于工程中对干扰抑制极化滤波器性能分析的需求，分别在理想条件及环境扰动条件下建立了用于描述干扰抑制极化滤波器性能的数学模型，仿真分析了极化滤波器的干扰抑制性能同干噪比、干扰极化状态以及环境扰动系数间的关系。随后为改善环境扰动影响下干扰抑制性能，提出了一种新的基于天线主辅阵联合的极化滤波的方法。最后通过极化雷达抗干扰实验不仅验证了极化滤波器性能表征模型的正确性，同时还在环境扰动条件下对比了两种滤波器性能，结果表明新的滤波方法在该扰动条件下干扰抑制方面的优势。