基于正交投影变换的宽带弱信号测向算法

为了解决强干扰环境下宽带多波束系统中弱信号的测向问题,提出了一种基于正交投影变换的弱信号测向算法。该算法根据强干扰方向构造干扰子空间的正交补子空间作为投影矩阵,对多波束频域数据进行变换,抑制强干扰对弱信号测向的影响。分析和仿真实验表明,算法能够有效抑制强干扰的影响,实现邻近弱信号的正确测向,提高了弱信号的分辨概率。

A Novel Wideband Direction Finding Algorithm for Weak Signals Based on Orthogonal Projection Transformation

In order to estimate weak signals directions correctly in presence of strong jamming for wideband beamforming system, a novel direction finding algorithm for weak signals based on or- thogonal projection transformation is proposed. A projection matrix which is equal to orthogonal complement subspace of jamming subspace is constructed to preprocess the multi-beam frequen- cy data. Effect of strong jamming on weak signals is suppressed. Analysis and simulations show that jamming could be suppressed by the proposed algorithm effectively, DOA estimation of near- by weak signals could be received, and resolution probability of weak signals is improved.