Research On The Localization Scheme For Underwater GPS

The underwater positioning system based on GPS technology is composed of buoy designing technology, underwater acoustic positioning technology and GPS satellite navigation technology, which can be effectiveiy applied to underwater targets positioning and tracking in the large-scale. With the corresponding, underwater GPS localization scheme is a highlight research in the area of current underwater positioning technology, which has broad military and civil perspective, and also a challenge in technology. In this paper, the research of underwater GPS localization will conduce of in-depth understanding to ocean, further ocean exploiture and marine protected, which of strategic significance.In this thesis, we presents a buoy network of underwater GPS positioning system model based on the wireless sensor network.The structure, function and process in the model were analyzed. Underwater target acoustic localization algorithm were explored through geometry way. Combined with the idea of Range-Free algorithm and distributed algorithm, a sensor nodes self-localization algorithm were designed, which called BSR (Beacons Signal Ring) localization algorithm, the algorithm performance evaluation and comparison has also been presented. The algorithm use a small number of anchor nodes. Each anchor emits beacons at different power levels. This mechanism does not required information exchange between neighboring sensors, and reduced the complexity of the algorithm and communication overhead effectively. The results of performance analysis showed that BSR provides a lower position estimation error than APIT and Centroid under a wide range of conditions. The thesis introduced process of target tracking, WSN to explore cooperation strategies and methods to detect target tracking.The thesis proposed the weighted centroid algorithm target location estimation model and linear prediction mechanism for target tracking, which required less communications and computing costs.