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根据最佳检测理论以及绝对最佳空间滤波器概念,给出了一种最佳空间滤波器的完整表达式。利用真实舰船航行辐射噪声作为目标及干扰,正态分布高斯白噪声作为噪声背景,在基元等间隔线阵上实现了最佳空间滤波器。给出了不同情况下常规波束形成及最佳空间滤波器处理基阵输出波束图。海上试验数据的实验室分析证明,此最佳空间滤波器能够有效地抑制弱信号附近空间不同方位的数个强干扰,完成指定弱信号的检测,而且该最佳空间滤波器可以方便、实时地在现役数字化声呐装备上实现。
According to the best detection theory and the concept of the absolute best spatial filter, a complete expression of the best spatial filter is given. Using the actual ship radiated noise as the target and interference, the normalized Gaussian white noise is used as the noise background, and the best spatial filter is implemented on the equidistant array of primitives. The beamforming of the output of the array with conventional beamforming and the best spatial filter is given under different conditions. The laboratory analysis of offshore test data proves that this optimal spatial filter can effectively suppress several strong interferences in different azimuths in the vicinity of the weak signal and accomplish the detection of the designated weak signal, and the optimal spatial filter can conveniently and real-time Implemented on active digital sonar equipment.