Underwater wireless sensor networks (UWSNs) are the enabling technology for various underwater applications, and the interest in UWSNs is growing. Applications of underwater sensing range from oil industry to aquaculture, pollution control, climate recording, prediction of natural disturbances, search and survey missions. Localization is one of the major and challenging tasks in UWSNs. Because underwater environment is usually complex and hostile, and beacons are prone to move offsetting from their origin positions and underwater channel occurs error easily. In UWSN sensor node finds its position communicating with fixed anchor nodes, those know its position or taking the help of some moving objects like under water vehicles or devices which can fall from surface of the sea to bottom of the sea. This paper makes a detailed comparison study about various localization schemes for underwater Sensor networks those using the help of moving objects such as Autonomous underwater vehicles (AUVs) and Detachable elevator transceivers (DETs).

Full text: IJEIR_1160_Final.pdf