基于子空间投影的功率倒置卫星导航抗干扰算法  

Power Inversion Anti-Jamming Algorithm for GNSS Based on Subspace Projection

作　　者：赵飞[1] 郎荣玲[1] 李武涛 ZHAO Fei;LANG Rongling;LI Wutao

机构地区：[1]北京航空航天大学,北京100191

出　　处：《现代导航》2017年第5期323-327,共5页Modern Navigation

摘　　要：基于线性约束最小方差准则的功率倒置算法用于干扰抑制领域中,在干扰来向上形成的零陷开口较宽,且当强弱干扰共存的时候,算法在弱干扰来向上引入的零陷深度较浅。通过研究及推导功率倒置算法的数学原理,将观测信号的协方差矩阵进行分解,得到相互正交的干扰子空间和噪声子空间,发现上述问题存在的原因是算法含有干扰空间的加权和。基于此,本文通过引入子空间投影方法,避免干扰子空间对算法的影响。通过仿真证明,本文算法可以在弱干扰方向形成较深的零陷,从而有效的改善算法的抗干扰能力。The power inversion(PI)algorithm based on the linear constrained minimum variance(LCMV)criterion is usedfor anti-jamming,and the deep null opening in the direction of interference is wider,and when the strong and weak interferencecoexists,the nulling of the algorithm is weak in the weak interference.By studying and deducing the mathematical principle of thepower inversion algorithm,the covariance matrix of the observed signal is decomposed to obtain the orthogonal subspace and thenoise subspace.The reason of the above problem is that the algorithm contains the weighted vector sum of the interference space.Based on this,this paper introduces the subspace projection method to avoid the influence of the interference subspace on thealgorithm.The simulation results show that the algorithm can form a deeper null in the direction of weak interference and improvethe anti-jamming performance of the algorithm effectively.

关 键 词：线性约束最小方差 功率倒置算法 子空间投影 抗干扰 

分 类 号：TN973.3[电子电信—信号与信息处理]