Title :
Joint localization and clock synchronization for wireless sensor networks
Author :
Chepuri, Sundeep Prabhakar ; Leus, Geert ; van der Veen, A.
Author_Institution :
Fac. of Electr. Eng., Math. & Comput. Sci., Delft Univ. of Technol., Delft, Netherlands
Abstract :
A fully-asynchronous network with one target sensor and a few anchors (nodes with known locations) is considered. Localization and synchronization are traditionally treated as two separate problems. In this paper, localization and synchronization is studied under a unified framework. We present a new model in which time-stamps obtained either via two-way communication between the nodes or with a broadcast based protocol can be used in a simple estimator based on least-squares (LS) to jointly estimate the position of the target node as well as all the unknown clock-skews and clock-offsets. The Cramér-Rao lower bound (CRLB) is derived for the considered problem and is used as a benchmark to analyze the performance of the proposed estimator.
Keywords :
clocks; synchronisation; wireless sensor networks; Cramer Rao lower bound; asynchronous network; broadcast based protocol; clock offsets; clock skews; clock synchronization; least squares; localization; simple estimator; target sensor; time stamps; unified framework; wireless sensor networks; Clock synchronization; clock-offset; clock-skew; localization; wireless sensor networks;
Conference_Titel :
Signals, Systems and Computers (ASILOMAR), 2012 Conference Record of the Forty Sixth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
978-1-4673-5050-1
DOI :
10.1109/ACSSC.2012.6489262
