UP Paper 899 US-W-LDOWN
Determination of the existence of LoS blockage and its application to UWB localization
Lee,Joon-YongHandong University
Yoon,Sung-JunUniversity of Pittsburgh
Kang,Shin-HooHandong University
Kang,A-YoungHandong University
Jo,Yung-HoonCore Logic, Inc.
Ha,Dong-HeonHandong University
The presence of a line-of-sight (LoS) blockage is one of the major causes of error for ultra-wideband (UWB) localization. It degrades the accuracy of time of arrival (ToA) estimation of the direct path signal by making multipath structure complex. Furthermore, propagation through the obstructing material introduces excess propagation delay which causes ranging errors. In this paper, a hypothesis test approach to determining the existence of LoS blockage in UWB propagation is proposed. This decision algorithm is tested on a set of indoor channel propagation data. When LoS blockage is detected, the maximum likelihood estimation (MLE) is used for ToA-based positioning. This ML localization algorithm is tested on another independent set of propagation measurements.
Joon-Yong Lee was born in Seoul, Korea, in 1970. He received the B.S. degree in electrical engineering from Hong-Ik University, Seoul, Korea, in 1993 and the M.S. and Ph.D. degrees in electrical engineering from the University of Southern California (USC), Los Angeles, CA, in 1997 and 2002, respectively. From 1998 to 2002, he was a Research Assistant with the Ultra-Wideband Radio Laboratory (UltraLab), USC. At USC, he worked primarily on the design of the ultra-wideband (UWB) ranging system. In the summer of 2000, he worked as an intern at Time Domain Inc., developing a UWB precision location system. In 2002, he joined the faculty of Handong University, where he is now Assistant Professor of computer science and electrical engineering. He has consulted for the Ministry of Information and Communication Republic of Korea (MIC). His research interests include the design of UWB ranging and positioning systems and the characterization of UWB propagation.