作　　者： ; ; ;

机构地区： 中国科学院声学研究所

出　　处： 《微计算机应用》 2011年第5期19-26,共8页

摘　　要： 随着水声探测频带延伸至低频/甚低频段,目前大孔径拖线阵声纳需要处理超过10倍频程的宽带信号。稀疏阵列虽能以较小系统工程代价获得足够窄的波束扫描宽度,但会产生严重的栅瓣效应,使弱目标检测变得困难。为了抑制强干扰的栅瓣效应对弱目标检测的影响,本文将MVDR方法应用于宽带组合阵处理,有效抑制了栅瓣模糊,扩展了处理频带。理论分析表明组合阵MVDR方法与CBF相比,具有显著的栅瓣抑制能力,通过仿真分析和海试数据分析验证了该方法的有效性。 Low frequency or very low frequency underwater acoustic detection demands very large array aperture to cover typically at least one decade in the frequency spectrum.In the case of sparse array,the sharper scanning beam width can be obtained without higher systematically engineering cost.But array performance analysis shows that sparse array elements will produce grating lobes that cannot be ignored.This will narrow down the effective processing frequency band.To restrain the impact of grating lobe effect of strong interference on weak target detection,this paper proposes a wide band MVDR beamforming based on compounding array,restraining grating lobe and expanding frequency band.Theoretical analysis shows that MVDR can yield better performance than CBF in terms of grating lobe restrain.The results of simulations and sea trial data processing indicate that the scheme put forward can effectively suppress wideband grating lobes and improve the performance of beamforming based on compounding array.

关 键 词： 甚低频 大孔径阵列 稀疏阵列 组合阵 栅瓣

领　　域： [自动化与计算机技术] [自动化与计算机技术]