Abstract: In order to estimate the number of coherent signals more effectively，proposes a Gerschgorin radii estimator that is designed for small array.This method has been proved in theory and applied successfully in the signal processing of shallow water Bathymetric Side-scan Sonar System（BSSS） whose array is small.In the Qiandao lake test of BSSS，this Gerschgorin radii estimator could detect the false signal of tail flow of boats effectively with less computer burden than that based on spatial smoothing and without cutting off the array aperture.

摘要： 针对均匀线阵提出了一种适用于小阵列去相关处理的盖氏圆准则应用方法。这种方法使盖氏圆准则在不减少阵列有效孔径的前提下，仍然可以对有相关性的信源数得到准确估计。从理论上证明了这个方法的可行性，并且把这个方法运用到浅水高分辨率测深侧扫声纳对附近船只尾流干扰信号的检测中，取得了比较好的效果。