对无线传感器网络定位算法的比较和分析  

COMPARISON AND ANALYSIS OF LOCALISATION ALGORITHM IN WIRELESS SENSOR NETWORK

作　　者：卢翔[1] 涂时亮[1] 陈章龙[1] 

机构地区：[1]复旦大学计算机科学与工程系,上海200433

出　　处：《计算机应用与软件》2009年第12期199-201,285,共4页Computer Applications and Software

摘　　要：如何利用无线传感器网络组建低成本、高精度的实时定位系统是近几年来研究的热点之一。通过对多组实验数据的比较和分析,提出了"基于RSSI(Received Signal Strength Indication)的测距算法不适用于无线定位系统"的观点,并在此基础上设计了一种基于TOA(Time Of Arrival)的改进算法——TS-TOA(Two-way Symmetrical TOA)。该算法利用双向对称的两次测距,降低了硬件上对时钟同步的要求,消除了时钟漂移产生的误差。最后,实现了一套基于TS-TOA的定位系统,实验数据表明,该算法有效地提高了定位精度,具有一定的实用意义。How to set up a low-cost, high-accuracy locating system based on Wireless sensor network is one of the popular topics being studied in recent years. According to our analysis on various sets of experimental data,we present the conception that the RSSI-based ranging algorithm is not suitable for wireless location system. In addition, a new algorithm named ＂TS-TOA＂ based on TOA is proposed. It successfully reduces the requirement of internodal clock synchronization and zeros the clock drift error by using bidirectional symmetric double ranging. At last, a locating system based on TS-TOA is implemented and the experimental data shows that the location accuracy is considerably raised, it has certain practical significance.

关 键 词：无线传感器网络 RSSI TOA 定位精度 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] P228[自动化与计算机技术—控制科学与工程]