一种基于分数低阶协方差矩阵的波束形成新方法

New beamforming method based on fractional lower order covariance matrix

利用稳定分布对具有脉冲特性的噪声进行建模,提出了一种新的分数低阶协方差概念,推导了一种基于分数低阶协方差矩阵的波束形成方法,并分析了其旁瓣特性。模拟表明新方法具有更高的信号干扰噪声比及更强的波束形成与旁瓣抑制能力。新算法在高斯和分数低阶稳定分布环境下比传统的算法具有更好的韧性。

Conventional array signal processing methods based on Gaussian noise assumption and second order statistics degraded under impulsive noises conditions. After introducing the statistical characteristics of stable distribution briefly, a new beamforming method based on the fractional lower order covariance matrix under alpha-stable noises conditions was proposed. The simulation results showed that the proposed method exhibited better signal to interference plus noise rate and beamforming performances. The method is more robust under both Gaussian and fractional lower order stable distribution environments than conventional method.