为提高卫星导航系统波达方向估计能力,利用功率倒置、空时联合滤波、MUSIC及其改进算法分别在干扰信号波达方向独立和相关条件下对比分析其波达方向估计能力。结果表明,波达方向独立时,功率倒置和空时联合滤波算法存在2°~3°估计偏差,而MUSIC及其改进算法能够准确估计;波达方向相关时,MUSIC和空时联合滤波算法失效,功率倒置法难以区分相关干扰信号,而MUSIC改进算法的估计误差为2°,可大幅提升波达方向估计准确性。

In order to enhance satellite navigation system's capability of estimating arrival direction of jamming, power inversion, space-time least-mean-square, multiple signal classification and its improved algorithm were applied to estimate arrival direction of jamming on independent and interrelated jamming respectively.The results show that:under the independent case, estimation error of power inversion and space-time least-mean-square algorithm is 2°~3°, while it is precisely estimated by multiple signal classification and its improved algorithm.Under the interrelated case, multiple signal classification and space-time least-mean-square algorithm are disable, and it is difficult for power inversion algorithm to identify the jamming, whereas, estimation error of the improved multiple signal classification algorithm is 2°which will enhance arrival direction veracity of jamming effectively.