The Study On Technology Of Three-dimensionai Location For Wireless Sensor Network Nodes On Shipboard

As an emerging distributed measuring and controlling technology, Wireless Sensor Network (WSN) has very broad application prospect considered as one of the top ten new technologies that would change the world of the 21 century. In general WSN in different fields has different characteristics. This paper researches the structure of the ship and the work environment of WSN nodes, put forward the method of 3D location on shipboard, and designs the related algorithm.The location method raised by this paper consists of two parts:location method among compartments and location method in a compartment. Location method among compartments refers to confirm the unknown nodes (refer to the nodes to be located) according to the topology of WSN on shipboard. To be specific, the position result is achieved by analyzing the different repeater nodes which are chosen by the unknown nodes when they send message packets to base station, and the result may be a cabin, a compartment or a deck. The precision of this location method is tightly related to the structure of the ship, distribution of nodes and routing algorithm of WSN. Location method in a compartment refers to the method in which we can calculate the position result by the distance relationship achieved by the RSSI (Received Strength Signal Indicator) between the unknown nodes and the anchor nodes (refer to the nodes located) in the compartment after obtaining the compartment of the unknown nodes.Using the nodes produced by American Crossbow this paper has verified the location method among compartments and location method in a compartment, and come to the conclusion that it is feasible to get the position result by the two methods. In addition, this paper has realized the location method in a compartment by writing TinyOS and Matlab programs.In a word, this paper has researched the characteristics of WSN on board, raised the location method among compartments and the location method in a compartment, realized the location algorithm among compartments, and verified them by doing experiments on YuKun, a teaching practice ship. This paper has explored and tried the WSN location on shipboard.