无线传感器网络RSSI测距方法与精度分析

Ranging Method and Accuracy Analysis Based on RSSI of Wireless Sensor Network

基于RSSI的测距技术是一项低成本的距离测量技术。分析了接收信号强度指示器(RSSI)多种测距模型,结合采用IEEE802.15.4协议的CC2430芯片,设计了测距实验,获取了多组数据,通过对实验数据的分析,提出结合信标节点确定参数、高斯拟合确定测量值的RSSI测距处理方法。实验证明,该方法能提高RSSI测距的抗干扰能力,20 m内节点间的测距精度能达到1.5 m以下。

Received Signal Strength Indicator（RSSI） ranging technology is a lowcost distance measurement technique. In this paper the models of ranging based on RSSI are analysed, and the ranging experiment is designed with the chip of CC2430, a number of data is obtained. The approach in which beacon nodes determine the parameters and Gaussian fitting determines the value of the RSSI measurement ranging is proposed by analysing the test data. Experiments show that the method can improve the anti-interference ability of RSSI ranging, and 20 meters ranging precision can reach 1.5 meters.