一种改善逆波束形成显示效果方法

在低信噪比条件下,由于协方差矩阵中主对角元素相比其他元素所含噪声能量大,致使逆波束形成(IBF)所得空间谱中目标方位处能量与其他方位处能量差别小、显示效果不好。对此,本文采用对协方差矩阵主对角元素进行修正法来降低噪声对IBF的影响,进而扩大目标方位与其他方位处能量差别,改善空间谱显示效果。 Matlab数值仿真和湖试数据处理结果均表明：在低信噪比条件下,本方法可改善IBF所得空间谱的显示效果。本文所述方法简单有效,可满足实际工程应用,为改善方位历程显示效果提供一个参考。

An improved method to enhance the display effect of inverse beam-forming

In the condition of lower signal-to-noise ratio(SNR), because the main diagonal elements contains more noise thanSother elements in covariance matrix, the energy difference between the target area and others area is small in spatial spectrum of inverse beam-forming (IBF), and the display effect of spatial spectrum is not desirable. In this paper, we corrected the main diagonal elements of covariance matrix to reduce the noise impact on IBF, enlargeSthe energy difference between the target area and others area, and improves display effect of space spectrum. Matlab numerical simulation and processed results of lake data show that this method can improve display effect of space spectrum for IBF in lower SNR. The method is simple and effective, and can suitable for the practical application, and provides an alternative method for improving time/bearing display effect.