Hybrid SADOA/TDOA mobile positioning for cellular networks

Author

Juang, R.-T. ; Lin, D.-B. ; Lin, H.-P.

Author_Institution

Inst. of Comput. & Commun., Nat. Taipei Univ. of Technol.

Volume

1

Issue

2

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

282

Lastpage

287

Abstract

A signal attenuation difference of arrival (SADOA) scheme is proposed to combine with the time difference of arrival (TDOA) method for mobile location estimation. On the basis of ratio of distances between the mobile and base stations derived from differences of signal attenuations, each SADOA measurement yields a circle on which the mobile may lie. Meanwhile, each TDOA measurement defines a hyperbola on which the mobile may reside. The proposed hybrid SADOA/TDOA scheme uses Taylor-series expansion to linearise the circles and hyperbolas and iteratively computes the mobile position based on least-squares estimation. Without perfect path loss modelling and hardware modification, the proposed scheme reduces location errors compared with either technique separately. Simulations demonstrate encouraging performance with 50% improvement over the conventional TDOA method in shadowing and non-line-of-sight propagation environments.

Keywords

cellular radio; iterative methods; least squares approximations; time-of-arrival estimation; SADOA-TDOA scheme; Taylor-series expansion; base station; cellular network; iterative computing; least-squares estimation; mobile location estimation; mobile positioning; signal attenuation difference of arrival scheme; time difference of arrival method;

fLanguage

English

Journal_Title

Communications, IET

Publisher

iet

ISSN

1751-8628

Type

jour

DOI

10.1049/iet-com:20050523

Filename

4167670