GPS天线阵抗干扰性能分析与改进

Analysis and improvement for performance of GPS antenna array interference suppression

空时自适应处理算法能够增强全球定位系统接收机的抗干扰性能,但是通过对均匀线阵和均匀圆阵进行理论分析发现,当强干扰信号垂直于天线阵组成的平面时,使得接收信号协方差矩阵奇异,不能计算最优权值,因而对特定方向的强干扰无法有效抑制。为了防止这种情况的出现,构建了基于立体结构的7单元天线的双正四面体阵,该阵型有效地减少了各天线共面情况的出现。仿真结果表明,新阵型不仅可以有效检测特定方向的强干扰,而且具有更好的天线方向图和捕获性能。

The space time adaptive processing algorithm can enhance the anti-j amming performance of global posi-tioning system receivers.Through the analysis of the uniform linear array and the uniform circular array,when the strong interference signal is perpendicular to the antenna array plane,the received signal covariance matrix becomes singular and directly induce the difficulty in calculating the optimal weights,the strong interference signal on the specif-ic direction cannot therefore be suppressed.In order to avoid such a situation and reducing the antenna coplanar condi-tion,a double tetrahedron array which is of a three-dimensional array structure with seven antenna elements is con-structed.The simulation results show that,the new array can not only mitigate the interference under different ex-treme scenarios,but also achieve better antenna pattern and capture performance.