TW-TOA based positioning in the presence of clock imperfections

Date
2016
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Source Title
Digital Signal Processing: A Review Journal
Print ISSN
1051-2004
Electronic ISSN
Publisher
Elsevier Inc.
Volume
59
Issue
Pages
19 - 30
Language
English
Type
Article
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Abstract

This manuscript studies the positioning problem based on two-way time-of-arrival (TW-TOA) measurements in semi-asynchronous wireless sensor networks in which the clock of a target node is unsynchronized with the reference time. Since the optimal estimator for this problem involves difficult nonconvex optimization, two suboptimal estimators are proposed based on the squared-range least squares and the least absolute mean of residual errors. We formulate the former approach as an extended general trust region subproblem (EGTR) and propose a simple technique to solve it approximately. The latter approach is formulated as a difference of convex functions programming (DCP), which can be solved using a concave–convex procedure. Simulation results illustrate the high performance of the proposed techniques, especially for the DCP approach. © 2016 Elsevier Inc.

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Keywords
Clock imperfection, Concave–convex procedure, Convex optimization, Positioning, Trust region subproblems, Two-way time-of-arrival (TW-TOA)
Citation
Published Version (Please cite this version)