Based On The Wireless Sensor Network Location System

Wireless sensor networks (WSN) is a comprehensive technology, involving network, wireless communication, sensor, micro-electronics and so on. WSN is consist of Large-scale WSN nodes. These nodes have the characteristic of low-cost, low power, small size, self-organization. Large-scale WSN nodes can be distributed in the area needing to be monitored, and then send the information to one sink node by a self-organizing networks. Because of easy application, low cost, versatile, etc., WSN are widely used in various fields.At present the major supporting technologies of Wireless sensor networks are:time synchronization technology, target location and tracking technology, distributed data management and information fusion, power control. This paper will introduce a location system based on wireless sensor networks, the system is divided into two parts:one is hardware node design; the other is realization of location algorithm. Because adopting advanced technique, the good ranging results are obtained and the maximum ranging error is less than 2 meters. Furthermore this paper realizes the MLE algorithm on the hardware platform and reach a high location accuracy level. According whit the actual test result, the maximum ranging error is less than 2meters.This paper is divided into eight chapters, the first chapter is an introduction; The second chapter is an overview of WSN; The third chapter introduces ranging mode; The fourth chapter describes WSN node hardware; The fifth chapter is about location algorithm; Chapter VI is the software for the microcontroller; Chapter VII is the PC-side software; Chapter VIII of the demonstration system for the actual location and location performance test; the last is the conclusion.