Self-Calibration Method for TOA based Localization Systems with Generic Synchronization Requirement


Zemene Walle Mekonnen and Armin Wittneben


IEEE International Conference on Communications, ICC 2015, London, UK , June 2015.

DOI: 10.1109/ICC.2015.7249051

[BibTeX, LaTeX, and HTML Reference]


In this paper, we propose and investigate a self-calibration method which estimates the locations and clock offsets of the anchors based on TOA measurements. The agent locations are not surveyed and hence they can be realized by a single moving agent, which makes the calibration procedure simple and cost effective. Instead of considering a specific clock synchronization scenario, which was the case with previous related works, we systematically classify different clock synchronization cases that may arise in practice and provide a generalized formulation of the self-calibration problem that covers all the synchronization classes. The maximum likelihood (ML) solution of the calibration problem, which jointly estimates all the unknown parameters, is shown to be a non-convex optimization problem. We propose to relax the ML estimator to a semi-definite programming (SDP) problem by applying semi-definite relaxation. To improve the accuracy of the SDP solution, we further refine it with the ML estimator. Simulation results confirm that the proposed method is capable of accurately calibrating TOA based localization systems.

Download this document:


Copyright Notice: © 2015 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.