一种基于优化RSSI精度的加权质心定位算法

摘要

Aiming at the influence of the received signal strength error in wireless sensor networks,on the basis of using the ratio of signal strength as the weighting factor,a weighted centroid localization algorithm based on optimized signal strength precision is proposed.First,the algorithm modified the signal strength (RSSI) value.A weighted factor of each RSSI value was counted,and the original RSSI values were replaced with weighted RSSI values.Then,the sum of the reciprocal of the ratio of the modified signal strength was used as the weighting factor of the algorithm.The experimental results show that the localization accuracy of our algorithm is improved by 61.5％ ～87.3％ than that of the traditional centroid algorithm,and 32.7％ ～ 46.4％ higher than the RR-WCL algorithm.%针对无线传感器网络中传感器节点接收信号强度的误差影响,在利用信号强度的比值作为加权因子的基础上提出一种基于优化信号强度、精度的加权质心定位算法.首先对信号强度(RSSI)值进行了修正:为每个RSSI值求得一个加权系数,用加权后的信号强度值进行运算;然后用修正后的信号强度的比值的倒数之和作为此算法的权重因子.实验结果表明,算法的定位准确度比传统质心算法提高了61.5％～87.3％,比RR-WCL算法提高了32.7％ ～ 46.4％.