加权质心定位误差的反向修正法

Error Back Correction for Weighted Centroid Localization

研究了距离因子g对加权质心定位算法(WCL)定位精度的影响,提出了全局最优g的选取方法。然后研究了未知节点自身位置对WCL算法定位精度的影响,并提出了一种基于估计位置和误差之间关系的反向(EB)修正法。仿真结果表明,全局最优g可以使质心附近区域的定位精度得到显著提高,但不能解决远离质心区域定位精度较差的问题,而EB修正法则可在保持质心附近区域定位精度的同时有效提高远离质心区域的定位精度。

Due to the fact that the range factor g of the Weighted centroid localization algorithm （WCL） can impact the localization accuracy significantly, the method of how to determine the optimum rang factor g for WCL was proposed. Then the localization error result from blind node＇s position was studied and the error back（EB） correction based on the correlation between estimated location and the error was proposed. Through simulations, it is demonstrated that the accuracy of WCL is highly improved by using optimum g for the nodes near the centroid, but the accuracy for the nodes near the edge of the simulation region still get low. EB could improve the accuracy for the edge area while keeping the accuracy in the center area.