基于RSSI的无线传感器网络定位算法的改进

Modified Localization Algorithm for WSNs based on RSSI

无线传感器网中,节点自身定位至关重要。目前,节点定位算法主要分为两种类型,即基于距离的定位算法和指纹库的定位算法。其中,基于接收信号强度指示(RSSI)的三角形质心定位算法由于实现简单而被广泛使用,但传统的三角形质心定位误差较大,从而影响了节点定位精度。针对这个问题,提出一种基于RSSI的改进定位算法——CLIP算法,并用于无线传感器网络定位。仿真结果表明,改进后的定位算法能大大提高无线传感器网络的定位精度。

Node self-localization is very important in wireless sensor networks. At present, there exist two types of node localization algorithms, including the algorithms based on distance and based on fingerprint database. The triangle eentroid localization algorithm based on RSSI（received signal strength indicator） is widely used for its simplicity. However, the error of triangle eentroid localization algorithm is relatively large, and this would directly affect the precision of node location. To solve this problem, an algorithm named CLIP is proposed and used in WSN location. Simulation results indicate that the modified localization algorithm can greatly improve the localization accuracy of wireless sensor networks.