基于RSSI的测距差分修正定位算法

Distance Difference Localization Algorithm Based on RSSI for Wireless Sensor Networks

为了抑制RSSI误差对无线传感器节点自身定位精度的影响,以三边定位算法为基础,定义了个体差异差分系数、距离差分系数和距离差分定位方程,把离目标节点最近的信标节点作为参考节点对基于RSSI的测距进行差分修正,并将差分法和质心法相结合提出了一种测距差分修正定位算法。该定位算法无需增加额外硬件开销,容易实现,定位误差可小于2.5m,适合于处理能力和能量有限的无线传感器网络节点。

In order to suppress effectively the effects of RSSI error to WSN node localization precision, indi- vidual difference coefficient, distance difference coefficient and distance difference localization equation are defined, based on the trilateration localization algorithm. The closest beaconing node to object node as ref- erence node corrects measure distance based on RSSI by difference method. A distance difference correction localization algorithm is put forward through combining difference method and weighted centroid averaging method. This localization algorithm needn＇t additional hardware spending, easy to be realized,and its loca- tion error is less than 2.5m, so it is fit for WSN node whose operation ability and power supply are re- stricted.