Determination of the existence of LoS blockage and its application to UWB localization

  • Authors:

  • Joon-Yong Lee;Yung-Hoon Jo;Shin-Hoo Kang;A-Young Kang;Dong-Heon Ha;Sung-Jun Yoon

  • Affiliations:

  • School of Computer Science and Electrical Engineering, Handong University, Pohang, Korea;Core Logic, Inc., Seoul, Korea and Ultra-Wideband Communication Laboratory, Handong University, Pohang, Korea;Ultra-Wideband Communication Laboratory, Handong University, Pohang, Korea;Ultra-Wideband Communication Laboratory, Handong University, Pohang, Korea;Ultra-Wideband Communication Laboratory, Handong University, Pohang, Korea;Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA and Ultra-Wideband Communication Laboratory, Handong University, Pohang, Korea

  • Venue:
  • MILCOM'06 Proceedings of the 2006 IEEE conference on Military communications
  • Year:
  • 2006

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Abstract

The presence of a line-of-sight (LoS) blockage is one of the major causes of error for ultra-wideband (UWB) localization. LoS blockage degrades the accuracy of the time of arrival (ToA) estimation of the direct path signal by making the 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 determine the existence of a LoS blockage in UWB propagation is proposed. Once the non-LoS is identified, the maximum likelihood estimation (MLE) is used for ToA-based positioning. This ML localization algorithm is applied to a set of indoor propagation measurements made in an office building.