The Research Of Relative Position Technology Of The Moving Target In WSN

In order to better adapt to the appilcation of wireless sensor networks, this paper explores the ranging technology and positioning algorithm. Through the research and understanding of the model of wireless signals propagation, the paper proposes the more practical model of wireless signals propagation. Based on many experiments, the paper gains the number of Path loss factor, and effectively transmorms the loss in propagation into distance information within the permission of errors. After compared with Commonly used localization algorithm, the paper conduct a preliminary positioning of the Nodes under test in wireless sensor networks by using the Maximum likelihood estimate method. By combining RSSI and influencing factors of distance, the paper offers the Localization algorithm based on the Weighted Taylor series, which can improve the accuracy of positioning, and it experiments and analyses the influence of density of beacon nodes on the accuracy of positioning and realizes the relative position of positioning of the moving targets in wireless sensor networks.