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TW-TOA based positioning in the presence of clock imperfections

Mohammad Reza Gholami ; Sinan Gezici ; Erik G. Ström (Institutionen för signaler och system, Kommunikationssystem)
Digital Signal Processing (1051-2004). Vol. 59 (2016), p. 19-30.
[Artikel, refereegranskad vetenskaplig]

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 formulated 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.

Nyckelord: Positioning; Two-way time-of-arrival (TW-TOA); Clock imperfection; Convex optimization; Trust region subproblems; Concave–convex procedure



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Denna post skapades 2016-08-15. Senast ändrad 2016-10-24.
CPL Pubid: 240289

 

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