Simulation and Experimental Study of a High-Resolution Method for Torpedo Vertical Highlights

In order to reduce calculation in the process of vertical scale identification of torpedo acoustic image,we present an improved decoherent multiple signal classification (MUSIC) method based on quadrature complex sampling which suits to estimating the vertical highlights of submarine with the characteristics of near distance and coherent signals .By the improved method, we process the high frequency signal received on the array with quadrature complex sampling to decrease sampling rate, and estimate the direction of the low frequency signal by the decoherent MUSIC method. A small-scale model experiment conducted in water tank for two coherent signals. Simulation and experimental results show that the present method can estimate accurately the direction of two coherent signals.