Enhanced position estimation via node cooperation

Date
2010
Advisor
Instructor
Source Title
2010 IEEE International Conference on Communications
Print ISSN
0536-1486
Electronic ISSN
Publisher
IEEE
Volume
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Pages
Language
English
Type
Conference Paper
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Volume Title
Abstract

Two-way time-of-arrival (TW-ToA) is a widely used ranging protocol that can provide the distance between two devices without time synchronization. One drawback of the TW-ToA is poor positioning accuracy in the absence of a sufficient number of reference ranging devices. Also, for a self-positioning system with a limited battery life, it might be necessary to limit the number of transmissions while satisfying accuracy constraints. In this paper, a cooperative positioning protocol [1] is studied, which can improve positioning accuracy compared to the conventional TW-ToA based positioning systems and also facilitate positioning with fewer packet transmissions; hence, it can prolong battery life on average. The maximum likelihood estimator is obtained for the cooperative technique and the limits on the positioning accuracy are quantified in terms of the Cramer-Rao lower bound (CRLB). Simulation results are provided in order to show performance improvements. ©2010 IEEE.

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Keywords
Cooperative positioning, Cramer-Rao lower bound (CRLB), Maximum likelihood, Time-of-arrival (ToA), Battery life, Cooperative positioning, Cramer-rao lower bound, Maximum likelihood estimator, Node cooperation, Packet transmissions, Performance improvements, Position estimation, Positioning accuracy, Positioning system, Self-positioning, Simulation result, Time synchronization, Time-of-arrival, Cramer-Rao bounds, Maximum likelihood estimation
Citation
Published Version (Please cite this version)