无畸变共形阵列抗干扰算法的降秩处理方法

Reduced Rank Processing of Distortionless InterferenceSuppression Algorithm for Conformal Array

摘要:

基于一种实际需求的共形阵列天线结构,对抗干扰算法进行讨论分析,提出了一种无畸变共形阵列抗干扰算法的降秩处理方法。基于有向阵元模型对凸共形阵列天线的特性进行分析与建模,将共形带来的影响概括为一个共形因子对导向矢量进行修正,再针对滤波器系数加入额外约束以保证系统不会导致北斗信号产生畸变,同时实现干扰抑制并保证北斗信号精度。针对空时滤波带来的计算复杂度偏高的问题,给出了基于前述算法的降秩处理架构,并采用不同的降秩方法对其进行了分析,有效降低了抗干扰算法的计算复杂度,提高了系统的实时性能。

Abstract:

An interference suppression algorithm was discussed and analyzed on thebasis of a conformal array antenna structure which was actually required. A reduced rankprocessing of distortionless interference suppression algorithm for conformal array wasproposed. The characteristics of convex conformal array antenna were analyzed and modeledon the basis of directional antenna element model. The impact of conformal was summarizedas a conformal factor to modify the steering vector, and extra constraints were added to thefilter coefficients to ensure that the system did not cause distortion of the Beidou signal. Inthis way, the suppression of interference is achieved and the accuracy of the Beidou signal isguaranteed at the same time. Aiming at the problem of high computational complexity caused by space-time filtering, a rank reduction processing architecture based on the abovealgorithm was presented, and different rank reduction methods were used to analyze it. Themethod effectively reduces the computational complexity of the interference suppressionalgorithm and helps improve the real-time performance of the system.