Mobile location with bias tracking in non-line-of-sight

Author

Nájar, Montse ; Huerta, Jose M. ; Vidal, Josep ; Castro, J. Antonio

Author_Institution

Dept. of Signal Theor. & Commun., Univ. Politecnica de Catalunya, Barcelona, Spain

Volume

3

fYear

2004

fDate

17-21 May 2004

Abstract

The main impairment for the location of terminals in a wireless communications system is the non-line-of-sight (NLOS) condition which is mainly due to blocking of the transmitted signal by obstacles. It is well known that NLOS biases time-of-arrival (TOA) and time-difference-of-arrival (TDOA) estimates, therefore providing a biased position. The paper analyzes the improvements in positioning accuracy by tracking the bias of the time measures with the Kalman filter proposed for location estimation. The evaluation of the approach has been carried out with measures taken in real scenarios, for positioning techniques based on TDOA and TOA+AOA (angle of arrival) measurements.

Keywords

Kalman filters; direction-of-arrival estimation; mobile radio; parameter estimation; radio tracking; tracking filters; AOA estimation; Kalman filter; TDOA estimation; TOA estimation; TOA+AOA estimation; angle of arrival estimation; bias tracking; mobile location; mobile wireless communications; nonline-of-sight; positioning accuracy; time-difference-of-arrival estimation; time-of-arrival estimation; tracking filter; Discrete Fourier transforms; Filters; Frequency estimation; Goniometers; Mobile communication; Position measurement; Time difference of arrival; Time of arrival estimation; Timing; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on

ISSN

1520-6149

Print_ISBN

0-7803-8484-9

Type

conf

DOI

10.1109/ICASSP.2004.1326705

Filename

1326705