摘要
TOA(time of arrival)估计是目前基于UWB的室内精确定位最常用的方法.然而由于室内多径因素的影响,TOA估计会不准确,使得测距也有较大误差.该文研究LOS环境下IR-UWB信号在室内多径信道中的时延特性.研究发现,发射的脉冲信号宽度与室内UWB信道信噪比对测距精度影响很大,从而为基于TOA的IR-UWB测距提供了有益参考.
Time of arrival (TOA) estimation used with UWB transmission is currently considered as the most popular technique for accurate wireless distance measurement system. Because of the severe indoor multipath components, this estimation may be inaccurate. In this paper, characteristics of delay based on IR-UWB in line-of-sight (LOS) channel are investigated. The results show that the pulse period and SNR of the channels have a considerable influence on precision, which provides useful references to the distance measurement based on IR-UWB.
出处
《应用科学学报》
CAS
CSCD
北大核心
2007年第3期327-330,共4页
Journal of Applied Sciences
基金
上海市科委国际合作项目(051107044)
上海市重点学科建设项目(T0102)
关键词
超宽带
测距
附加延时
均方根延时
ultra-wide band
distance measurement
excess delay
RMS delay