Passive velocity estimation of underwater targets based on the multitaper synchrosqueezing cross-spectrum

Abstract

A new velocity estimation method for maneuvering targets using a single sensor in ocean waveguides is proposed. Unlike the conventional cross-spectrum method, the proposed velocity estimation method can perform non-uniform velocity estimation. First, a new cross-spectrum signal model in a non-uniform velocity state is derived. The derivation result shows that the cross-spectrum acoustic field possesses time-varying frequency characteristics in the non-uniform velocity state. Second, based on the time-varying characteristics of the cross-spectrum, the multitaper synchrosqueezing cross-spectrum (MSSTC-S) method is proposed to obtain the maximum velocity estimation accuracy. Finally, simulations and experiments verify the effectiveness of the proposed method, and the results show that it can estimate the target non-uniform velocity in real time with good estimation accuracy.