Research on Location of Underwater Sound Source Target in Deep Sea Sound Field Based on Bellhop Model

In order to locate the near-surface sound source in deep sea, this paper presents a joint positioning method for underwater sound source location estimation based on impulse response of arrival signal channel and Time difference of Arrival (TDOA). Firstly, a BellHop model is established to simulate the complex underwater acoustic propagation environment, and the matching search of the sound source distance is carried out by using the characteristic parameters of the arriving signal beam. The autocorrelation function of the first sea bottom reflection wave and the sea bottom reflection wave signal is calculated to get the time delay of these two signals, using the time delay to search the depth of sound source. The simulation results show that the estimation error of the target distance using the characteristic parameters of the arrival signal beam is less than 6%, the estimation error of target depth using TDOA is no more than 0.001. Combining the two methods, the target location can be realized, the positioning method has the characteristics of high computational efficiency and positioning accuracy.