多重闪烁干扰下高精度卫星导航算法研究

Research on High Precision Satellite Navigation Anti-interference Algorithm under Multiple Flicker Interferences

摘要:

传统卫星导航抗干扰高精度算法只适用于处理平稳的干扰信号，难以适应无序脉冲组成的多重闪烁干扰环境。本文基于干扰协方差矩阵重建思想，提出一种新的适用于多重闪烁干扰环境下的卫星导航高精度抗干扰算法并进行仿真对比分析。通过压缩感知完成单采样点干扰测向，使用干扰噪声矩阵重建理论构造协方差矩阵，使用自适应波束约束算法实现单采样点天线阵列波束赋形，最终实现在干扰方向形成固定零陷，在卫星方向形成波束指向。与传统波束约束高精度抗干扰算法相比，该算法可以实现单采样点抗干扰权值计算，适用于快时变多重闪烁干扰环境。仿真结果证明：该算法可以在有效滤除多重闪烁干扰信号的同时在卫星导航信号方向维持波束指向，保障卫星导航信号观测精度，满足高精度卫星导航需求。

Abstract:

The traditional satellite navigation anti-jamming high-precision algorithm is only suitable for processing stable interference signals, which is difficult to adapt to the multiple disordered pulsed flicker interferences environment. Based on the idea of interference covariance matrix reconstruction, this paper proposes a new high-precision anti-interference algorithm that is suitable for multiple flicker interferences environment and carries out simulation analysis. Firstly, the direction of interferences is calculated by using compress sensing with one snapshot. Secondly, the interference plus noise covariance matrix is reconstructed. Thirdly, antenna array beamforming with one snapshot is realized by using an adaptive beam constraint algorithm. Finally, the new algorithm forms nulls in the direction of interferences and forms a beam in the direction of satellite navigation signals. Compared with the traditional algorithm, the new algorithm calculates anti-interference weight with only one snapshot and is suitable for fast time-varying multiple flicker interferences environment. The simulation results show that the new algorithm can effectively reduce multiple flic-ker interferences and maintain a beam in the direction of satellite navigation signals to ensure the observation accuracy meets the requirements of high-precision satellite navigation.