In research of WSNs, because of large error of centroid localization algorithm, the region of target localization has been reduced and divided into many small grids. Using the relation of object and location node, effective grids are obtained. By these left grids and modified weighted centroid of grids localization algorithm that is modified weighted centroid of grids localization algorithm is presented. The simulation shows that the localization of target error obtained by this method is about 0.6m. And the errors of centroid localization algorithm and ordinary centroid of grids localization algorithm are about 3.6 m and 2.4 m. Modified weighted centroid of grids localization algorithm is better than the others. It also has character of real time and has its own advantage.%在无线传感器网络研究中,由于传统质心定位法存在很大误差,须将目标定位存在的区域进行进一步缩小,并且将此区域划分为许多网格.利用定位节点和目标的探测关系,从而得到有效网格,再对这些有效网格利用修正权值的方法进行目标定位,即提出的修正权值网格质心定位法.仿真表明:这种方法得到的目标位置误差只有0.6m左右,而传统质心定位法和普通网格质心定位法的误差分别为3.6,2.4m左右.表明修正权值网格质心定位法精度远远高于这2种方法,同时它的实时性也可靠,从而显示了修正权值网格质心定位法的优越性.
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