基于传播算子的卫星导航系统干扰源直接定位方法

Direct positioning method of interference source of satellite navigation system based on propagation operator

针对现有单星定位技术精确度不足问题,提出一种基于传播算子的卫星导航系统干扰源直接定位方法,解决现有技术无法快速有效地定位中高轨卫星干扰源的问题。对卫星接收信号建模,计算每个时刻的接收信号协方差矩阵,通过对协方差矩阵分块,计算得到传播算子,进而得到导向矢量正交投影子空间的估计;然后建立损失函数,通过搜索得到干扰源位置估计结果。理论分析和仿真结果证明,该算法在复杂度大大降低的同时,定位精确度与传统基于多重信号分类(MUSIC)的直接定位算法相当,远优于现有的测向定位技术,具有重要的工程应用价值。

To address the problem of insufficient precision of existing single-satellite positioning techniques,a direct positioning method of interference source for satellite navigation system based on propagation operator is proposed.Firstly,the received signal of the satellite is modeled and the covariance matrix at each moment is calculated.After blocking the covariance matrix,the propagation operator is obtained to estimate the orthogonal projection subspace of the steering vector.Then the loss function can be established and the position of the interference source can be estimated by searching the loss function.Theoretical analysis and simulation results prove that the localization accuracy of the proposed method is comparable to that of the traditional Multiple Signal Classification(MUSIC)-based direct positioning algorithm,while the calculation complexity is greatly reduced.Meanwhile,the localization accuracy is much higher than that of the existing bearing-only localization techniques,which is valuable for practical engineering applications.