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Locating the nodes: cooperative localization in wireless sensor networks

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6 Author(s)
Patwari, N. ; Michigan Univ., Ann Arbor, MI, USA ; Ash, J.N. ; Kyperountas, S. ; Hero, A.O.
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Accurate and low-cost sensor localization is a critical requirement for the deployment of wireless sensor networks in a wide variety of applications. In cooperative localization, sensors work together in a peer-to-peer manner to make measurements and then forms a map of the network. Various application requirements influence the design of sensor localization systems. In this article, the authors describe the measurement-based statistical models useful to describe time-of-arrival (TOA), angle-of-arrival (AOA), and received-signal-strength (RSS) measurements in wireless sensor networks. Wideband and ultra-wideband (UWB) measurements, and RF and acoustic media are also discussed. Using the models, the authors have shown the calculation of a Cramer-Rao bound (CRB) on the location estimation precision possible for a given set of measurements. The article briefly surveys a large and growing body of sensor localization algorithms. This article is intended to emphasize the basic statistical signal processing background necessary to understand the state-of-the-art and to make progress in the new and largely open areas of sensor network localization research.

Published in:

Signal Processing Magazine, IEEE  (Volume:22 ,  Issue: 4 )

Date of Publication:

July 2005

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