减少无线传感器网络节点定位误差的方法

Reduction of wireless sensor node localization errors

为提高无线传感器网络节点定位精度,提出3种基于距离信息的改进定位算法:改进三边测量法、加权最小二乘估计、抗差最小二乘估计。在一定先验假设情况下,对三边测量法以及由其衍生出最小二乘估计进行改进,并将抗差最小二乘估计方法引入到节点定位计算之中。仿真结果表明:3种算法能够有效减少定位误差。抗差最小二乘估计在系统存在粗差情况下效果尤其显著。当系统对能耗要求严格时,可采用改进三边测量法或加权最小二乘估计替代抗差最小二乘估计。

A three-sided measurement method,a weighted least squares estimation method and a robust least squares estimation method are used to make wireless sensor network node localization more accurate.The three-sided measurement method and the least squares estimation method based on the three-sided method are improved for a specific set of assumptions.A robust least squares estimation method is used to improve node localization.Simulations show that these methods reduce the localization error.The robust least squ...