Title :
Mobile location tracking with NLOS error mitigation
Author :
Wann, Chin-Der ; Chen, Yi-Ming ; Lee, Ming-Shiung
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan
Abstract :
We present a mobile location tracking method with non-line-of-sight (NLOS) error mitigation for network-based wireless location systems. Based on the reconstructed LOS time of arrival (TOA) results from NLOS propagation identification and correction, geometric location techniques are used to calculate the location estimate of a mobile station. General TOA geometric cases and positioning solutions are analyzed. The time sequence of location samples is processed by Kalman filtering for position tracking and velocity estimation. A post-Kalman filter smoothing method is also applied to improve the velocity estimation. It is shown that the location tracking error can be reduced by processing the reconstructed line-of-sight TOA measurements with Kalman filtering.
Keywords :
Kalman filters; land mobile radio; parameter estimation; radio direction-finding; radiowave propagation; smoothing methods; Kalman filtering; NLOS error mitigation; NLOS propagation correction; NLOS propagation identification; TOA geometric cases; geometric location techniques; line-of-sight TOA measurements; location estimation; location samples; location tracking error; mobile location tracking; mobile station; network-based wireless location systems; nonline-of-sight error mitigation; position tracking; positioning solutions; post-Kalman filter smoothing method; reconstructed LOS time of arrival; time sequence; velocity estimation; Additive noise; Base stations; Filtering; Intelligent transportation systems; Kalman filters; Noise measurement; Position measurement; Testing; Time measurement; Velocity measurement;
Conference_Titel :
Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE
Print_ISBN :
0-7803-7632-3
DOI :
10.1109/GLOCOM.2002.1188485
