一种用于无线传感器网络节点递增式定位的新方法

摘要

针对递增式无线传感器节点定位中的误差累积问题,提出了一种基于最优加权最小二乘估计的节点定位改进方法,以提高节点的定位精度.在加权最小二乘估计法中,以加权系数为核心,对加权最小二乘进行改进,在估计误差方差矩阵最小时得出最优加权最小二乘的无偏估计解,此时权值可根据方差阵的逆阵来取得最高精度的估计值.仿真结果表明,此方法能有效抑制累积误差中测距误差与定位误差带来的影响,提高节点定位精度.%The problem of accumulative location error in the incremental localization approach is analyzed. An improved method based on Optimal Weight Least Square(OWLS) Algorithm is proposed to improve the precision of the nodes position. On the basis of weight in WLS, the method of WLS is improve and the unbiased estimated solution is got,at that time the covariance matrix of estimated error reaches the minimum. And the most accurate estimated answer of the weight can be got through the inverse matrix of covariance matrix. The simulation results show that the improved approach can restrain the cumulative error includingdistance error and positioning error effectively and enhance location precision.