Analysis of TDOA and TDOA/SS based geolocation techniques in a non-line-of-sight environment

Author

Huang, Jiyan ; Wan, Qun

Author_Institution

Department of Electronic Engineering, University of Electronic Science and Technology of China, China

Volume

14

Issue

5

fYear

2012

Firstpage

533

Lastpage

539

Abstract

The performance analysis of wireless geolocation in a non-line-of-sight (NLOS) environment is a very important issue. Since Cramer-Rao lower bound (CRLB) determines the physical impossibility of the variance of an unbiased estimator being less than the bound, many studies presented the performance analysis in terms of CRLB. Several CRLBs for time-of-arrival (TOA), pseudo-range TOA, angle-of-arrival (AOA), and signal strength (SS) based positioning methods have been derived for NLOS environment. However, the performance analysis of time difference of arrival (TDOA) and TDOA/SS based geolocation techniques in a NLOS environment is still an opening issue. This paper derives the CRLBs of TDOA and TDOA/SS based positioning methods for NLOS environment. In addition, theoretical analysis proves that the derived CRLB for TDOA is the same as that of pseudo-range TOA and the TDOA/SS scheme has a lower CRLB than the TDOA (or SS) scheme.

Keywords

Cramer-Rao bounds; Estimation theory; Mobile communication; Time difference of arrival; Cramer-Rao lower bound (CRLB); hybrid schemes; mobile location; non-line-of-sight (NLOS); time difference of arrival (TDOA);

fLanguage

English

Journal_Title

Communications and Networks, Journal of

Publisher

ieee

ISSN

1229-2370

Type

jour

DOI

10.1109/JCN.2012.00011

Filename

6360052