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节点位置信息是无线传感器网络应用的基础。基于RSSI(Receive Signal Strength Indicator)的测距技术因其低成本和低复杂度的优点而被广泛用于无线传感器网络的定位技术中。介绍了RSSI信号传输模型,在介绍无线传感器网络定位基本原理的基础上,分析了影响定位精度的因素。综述了近几年提出的无线传感器网络中基于RSSI的节点定位算法及其改进算法,现有基于RSSI定位算法的改进算法主要从测距精度改进、定位精度改进或误差修正改进等方面进行。最后,指出了基于RSSI的无线传感器网络节点定位算法的不足,并进行展望。
Node location information is the basis for wireless sensor network applications. Because of its low cost and low complexity, ranging technology based on RSSI (Receive Signal Strength Indicator) is widely used in the positioning technology of wireless sensor networks. The RSSI signal transmission model is introduced. Based on the introduction of the basic principle of wireless sensor network positioning, the factors affecting the positioning accuracy are analyzed. The RSSI-based node localization algorithm and its improved algorithm are reviewed in recent years. The existing algorithms based on RSSI localization algorithm are mainly from the aspects of ranging accuracy improvement, positioning accuracy improvement or error correction improvement. Finally, the shortcomings of RSSI-based node localization algorithm are pointed out and prospects are given.