A Nonline-of-Sight Error-Mitigation Method for TOA Measurements

Author

Ma, Changlin ; Klukas, Richard ; Lachapelle, Gérard

Author_Institution

Dept. of Geomatics Eng., Calgary Univ., Alta.

Volume

56

Issue

2

fYear

2007

fDate

3/1/2007 12:00:00 AM

Firstpage

641

Lastpage

651

Abstract

In wireless location, nonline-of-sight (NLOS) errors are a major error source. To improve positional performance, these errors should be identified and mitigated before measurements are used in position computations. A novel NLOS mitigation algorithm is proposed in this paper. Employing system redundancy, the algorithm derives from the distribution function of hyperbolic intersections, which is an intermediate mobile location. Cost functions based on the intermediate position are then created for each time-of-arrival measurement. NLOS errors are detected and mitigated via hypothesis tests performed on the cost functions. Simulation tests are presented in this paper, and the results verify the effectiveness of this NLOS-error-mitigation method. This paper also demonstrates that algorithm performance depends closely on receiver noise. Reducing receiver noise or providing the intermediate mobile location via external aiding can improve performance

Keywords

mobile radio; time-of-arrival estimation; TOA measurement; distribution function; hyperbolic intersections; hypothesis tests; mobile location; nonline-of-sight error-mitigation method; receiver noise; time-of-arrival measurement; Cellular phones; Cost function; Distribution functions; FCC; Helium; Noise reduction; Performance evaluation; Position measurement; Redundancy; Testing; Distribution function (DF); hyperbola intersection; n online-of-sight (NLOS) error; wireless location;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/TVT.2007.891439

Filename

4138035