干扰环境下用于GPS接收机的波束形成算法分析

Analysis of beamforming algorithms for GPS receivers in the jamming environment

以GPS抗干扰接收机为背景,研究了基于线性约束最小方差的波束形成算法MVDR和PI的抗干扰性能,分析了算法实现中由于协方差矩阵以及DOA估计误差所带来的性能损耗以及应用场合。在ULA阵和不同干扰信号DOA环境下,利用GPS软件信号源对算法进行仿真并分析了算法对SINR的影响。仿真验证了MVDR和PI对压制性宽带干扰的抑制能力。另外给出了算法输出SINR受期望信号和干扰信号"距离"影响的性能曲线,从而评估干扰源对GPS信号的影响,并为接收机定位解算中的星座选择提供一定的依据,以提高定位精度。

This paper investigates the anti-jamming capability of two beamforming algorithms with linear constraints based on minimum variance criterion, MVDR and Pl in the GPS anti-jamming receiver, and simultaneously analyzes implementation scenarios and the performance loss brought in by the estimation errors of covar lance matrix and DOA. The GPS software signal source is used to analyze the algorithm＇s performance under UI.A array and different DOAs of the expected signal. The simulation validates the satisfactory performance of broadband jamming elimination. Besides, the performance curve of SINR output versus the ＂distance＂ between the expected signal and the jamming signal is presented, from which we can access the influence on the GPS signal from jamming source and determine the corresponding constellation selection in the navigation solution, and improve the position precision for GPS receiver.