A novel dual-hydrophone localization method in underwater sensor networks

In this paper, we propose a novel dual-hydrophone localization method, termed DHL, in underwater sensor networks. The objective is to reduce the impact of the serious disturbance of noise, poor link quality, long latency, limited bandwidth and low data rate. For underwater localization problems, DHL uses dual-hydrophone nodes to convert the localization problem into half-plane intersection issues. In particular, DHL adopts the sign of TDOA (Time difference of arrival) from the acoustic source to the pairwise hydrophones as the binary measurement information, in order to narrow the feasible region of the acoustic source. To test the performance of DHL, we evaluate it with extensive simulations. The simulation results demonstrate that DHL achieves higher robustness than the TDOA-based method when location and angle errors of nodes exist. Consequently, DHL is a promising scheme for underwater localization in adverse conditions.