基于TDOA的室内超声波定位方法的改进

基于超声波和射频信号的TDOA（Time Difference Of Arrival,TDOA）室内无线传感网定位系统得到了越来越普遍的研究。其以距离测量为基础计算待测节点坐标。测距的误差影响定位结果的准确性。因此,文中主要目的是介绍基于超声波技术和射频技术定位系统的工作原理,通过采用总体最小二乘法（Total Least Square,TLS）的直线拟合方法对距离测量误差进行补偿,修正距离值,然后采用极小极大算法（Min-Max algorithm）进行定位的位置坐标计算,得到系统测距误差较小和定位准确性高的结果。实验数据仿真表明,该方法提高了距离测量精度和系统的定位准确性。

Improved Indoor Location Method for Ultrasonic System Based on TDOA

The wireless sensor network positioning systems based on ultrasonic and RF of TDOA are widely being researched.It calculates blind node coordinates on the basis of distance measurement.Ranging errors affect the accuracy of positioning results.In this paper,the aim is to introduce the working principle of positioning system based on supersonic and radio technology,the linear fitting method of total least square is used for error compensation of distance measurement,which can obtain the distance correction values,and then the min-max algorithm is used to compute the location coordinates,acquiring the result with low measure error and high location accuracy.Experiment results show that this method makes the system achieve high precision of distance measurement and high positioning accuracy.