Abstract: To weaken the received signal strength indication error of wireless sensor network node positioning accuracy, this paper proposes a weighted centroid localization algorithm to optimize the received signal strength indicator ranging precision. The algorithm is based on the Received Signal Strength Indicator （RSSI） and the Link Quality Indicator （LQI） in the fluctuation of the fading fluctuation curves at different distances. It uses the method of piecewise ranging accuracy optimization RSSI, then the optimized distance is valued as the weight factor weighted centroid algorithm to locate the node, so it improves the positioning accuracy. Simulation results show the validity of the optimization algorithm.

Key words: Received Signal Strength Indicator（RSSI）, centroid localization algorithm, segments ranging, Link Quality Indicator（LQI）

摘要： 为消弱接收信号强度指示误差对无线传感器网络节点定位精度的影响，提出基于优化接收信号强度指示测距精度的加权质心定位算法。该算法根据接收信号强度指示（RSSI）和链路质量指示（LQI）在不同距离段的衰落曲线起伏的波动状况，采用分段测距的方法优化RSSI的测距精度，接着将优化后的距离值作为加权质心算法的权值因子对节点进行定位，进而提高定位精度。实验结果验证了该优化算法的有效性。

关键词: 接收信号强度指示（RSSI）, 质心定位算法, 分段测距, 链路质量指示（LQI）