一种复杂环境下无线传感器网络定位算法

A Localization Algorithm in Complex Environment for Wireless Sensor Networks

通过对建立定位算法求解数学模型,针对RSSI(接收信号强度)受环境影响较大而提出了基于RSSI实际检测的定位算法。该算法利用锚节点实地测量信号损耗来确定定位算法的权值因子,以此进一步提高复杂环境下节点定位精度。通过模拟障碍物环境仿真实验分析可以看到,与加权质心算法相比,此定位算法的平均定位误差可下降1/4左右,而随着环境复杂度的提高,尤其是障碍物地带,其定位精度可提高一半左右。

By analyzing the solutions of localization model and the environmental affects for RSSI（Received Signal Strength Indication）, a localization algorithm based on RSSI practical measurement was provided. Beacon nodes are used to measure the signal loss which can be used to calculate the weights to prompt localization accuracy. The simula- tions in complex environment results show that the average localization error will be reduced to around a quarter and even to approximately half especially in the obstacle area compared to the centriod algorithm.