The study on time-variant characteristics of under water acoustic channels

With the characteristics of high ambient noise level, very narrow bandwidth, low carrier frequency, enormous propagation latency and time-space-frequency variant multipath effect, the stochastic ocean channel is very complex and difficult to achieve reliable UWA communications. The study of transmission characteristics is an important but weak link in underwear acoustic communication technology, so the study of underwater acoustic channel model has a very important practical significance. In this paper, based on conventional ray theory we have established N-path deterministic model, while taking advantage of BELLHOP, and introducing WSSUS channel model for shallow UWA channel transmission characteristics, and also have improved a shallow UWA time-variant channel model testing system performance. Comparing with the deterministic model, Simulation results show that the model is more intuitive and realistic.