Abstract: 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.

Key words: ultra-wide band, distance measurement, excess delay, RMS delay