摘要
有效的滤波方法和多尺度估计是无线定位技术的重要研究方向。为了减小在蜂窝网无线定位中非视距传播(NLOS)对波达时间(TOA)测量距离的误差影响,先结合NLOS误差特性对标准Kalman滤波进行修正,然后提出将不同采样率的修正Kalman滤波方程与多个尺度联系起来,建立了一种动态多尺度系统(DMS)模型,并给出基于Haar小波的实现方法。仿真结果表明,基于上述方法优于直接进行Kalman滤波的效果,能较大幅度地提高TOA测量距离的精度。
Effective filter and multiscale estimation are important research areas in wireless position location technology. In order to reduce the error effect of non-line of sight (NLOS) propagation for time of arrival (TOA) measurements, the Kalman filter was improved based on the analysis of the error speciality for NLOS. Then a dynamic multiscale system (DMS) was built by associating the different sampling based Kalman filter equation with multiscale, and the realization method using Haar wavelet was given. Simulation results show that the estimation effect of this method is better than that is gained by performing Kalman filter directly, and the method can markedly improve the range accuracy based on TOA measurements.
出处
《重庆邮电大学学报(自然科学版)》
2007年第4期468-471,共4页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
关键词
非视距传播
波达时间
卡尔曼滤波
动态多尺度系统
HAAR小波
non line of sight (NLOS) propagation
time of arrival (TOA)
Kalman filter
dynamic multiscale system (DMS)
Haar wavelet
作者简介
胡焰智(1982-),男,湖北黄冈人,硕士研究生,研究方向为蜂窝网定位技术。E-mailyanzhihu06@yahoo.com.cn。
马大玮(1972-),男,四川盐亭人,硕士生导师,研究方向为通信与信息系统、信号处理。
王昭莲(1983-)女,湖北宜昌人,硕士研究生,研究方向为信号处理。
杨琬(1983-)女,河南信阳人,硕士研究生,研究方向为信号处理。