应用自适应滤波抑制星载接收机带内干扰的探索

摘要

为抑制卫星内对星载接收机的带内电磁干扰,文章分析了星载接收机在卫星上的电磁环境,提出将自适应滤波器应用到星载接收机上降噪,设计了自适应滤波器及其算法,分析了噪声的多径效应对自适应滤波的影响,明确了接收机天线、信道增益设计要求.对自适应滤波器在抑制星载接收机带内电磁干扰的效果进行了仿真和分析.仿真结果表明:自适应滤波提高了星载接收机抑制卫星带内电磁干扰信号的能力,为星载接收机的电磁兼容设计提供了一种主动适应卫星平台电磁环境的新思路.%To suppress in-band electromagnetic interference from satellite platform with the satellite receiver,the paper analyzes the electromagnetic environment of the satellite receiver,and proposes that an adaptive filter is applied in the satellite receiver for noise suppression,and an adaptive filter and its algorithm are designed.Meanwhile,the noise multipath effect an adaptive filtering is analysed,the demand of the design of the antenna and the channel gain in the satellite receiver is given.The suppressing effect for the in-band electromagnetic interference with the satellite receiver which is using an adaptive filter is simulated and analyzed.The simulation results prove that the adaptive filter has a fine performance for the suppression of the satellite platform interference.The adaptive filtering can be as a new method for electromagnetic compatibility (EMC) design of the satellite receiver,which makes the receiver adopted to the electromagnetic environment of the satellite platform actively.