卫星导航系统中天线阵的选择研究

摘要

In this paper,based on the power inversion( PI) array principle and space⁃time filtering anti⁃interference technology,an unconstrained space⁃time adaptive processing ( STAP ) anti⁃interference algorithm is used to analyze and simulate the anti⁃interference performance of uniform circular array is analyzed and simulated.For this algorithm,it is not required to pre⁃know satellite location infor⁃mation,navigation receiver position information and receiving antenna attitude information,thus the computing complexity of sampling matrix inversion(SMI)is reduced.The simulations are performed for interference effect of narrow⁃band interference and broadband inter⁃ference based on MATLAB in different conditions, and the results show that the unconstrained space⁃time adaptive anti⁃interference algorithm can effectively determine the interference signal DOA of uniform circular array(UCA),and accurately estimate the azimuth angle and elevation angle of interference signal,and the anti⁃interference effect is best;and on the direction of interference,there is null⁃ing with certain depth,the stronger the interference power,the deeper the nulling.Compared with LCMV algorithm,this algorithm can better improve the signal to interference ratio of system.%根据功率倒置（ PI）阵列原理，基于目前空时滤波的抗干扰技术，采用无约束空时自适应抗干扰算法，对均匀圆形阵列的抗干扰性能进行分析仿真。该算法不需要预先知道卫星的位置信息、导航接收机位置信息以及接收天线姿态信息，降低了采样矩阵求逆（ SMI）算法的运算复杂度。在MATLAB中对窄带干扰和宽带干扰在不同情况下的干扰抑制效果进行仿真，仿真结果表明，无约束空时自适应抗干扰算法能够有效地判定干扰信号的波达方向，均匀圆形阵列不仅可以准确估计出干扰信号的方位角和俯仰角，且刚干扰效果最好；并在干扰方向上产生一定深度的零陷，干扰功率越强，产生的零陷越深。与LCMV算法相比，该算法能更好地改善系统输出信干比。