基于RSSI和智能天线的联合定位算法

摘要

研究提高室内定位精度问题,终端定位是无线传感器网络中的关键技术之一,由于室内环境复杂,遮挡物较多,使定位信号减弱.传统RSSI的定位算法使目前室内定位不能满足要求.为解决RSSI测量方法误差较大的问题,提出一种将RSSI测量值与波束切换智能天线相结合的联合定位算法.同时引入了网格和半波瓣的概念,利用波束切换智能天线将信号最强的波束对准终端,同时终端上报RSSI值来联合定位.仿真结果表明,在获得相同定位精度的条件下,方法避免了样本采集,不需要训练时间,为定位精度设计提供了借鉴.%Terminal location is one of the key technologies in wireless sensor networks, but the indoor location al gorithm based on RSSI is very hot. In order to resolve the issue of large error, this paper presented a joint location al gorithm which combines RSSI with smart antenna. Beam switch smart antenna used the strongest signal beam to align terminals, while terminals reported the RSSI value to determine the position. And the paper has introduced the con cept of grid and half beam. The simulation results show that, to achieve the same accuracy, this method avoids the sample collection, no training time, and has strong reference for some occasions which have less demand for position accuracy.