Authors: Loredana Arienzo, Maurizio Longo
Addresses: Institute for the Protection and Security of the Citizen, Joint Research Centre, European Commission, Ispra 21027, Varese, Italy. ' Department of Electrical and Information Engineering, University of Salerno, Fisciano 84084, Salerno, Italy
Abstract: In this paper, the problem of collaborative tracking of mobile nodes in wireless sensor networks is addressed. Aiming at an efficient resource exploitation, the research adopts a strategy of combining target tracking with node selection procedures in order to select informative sensors to minimise the energy consumption of the tracking task. We layout a cluster-based architecture to address the limitations in computational power, battery capacity and communication capacities of the sensor devices. We consider the computation of the Posterior Cramer-Rao Bound (PCRB) on the tracking accuracy based on Received Signal Strength (RSS) measurements. To track mobile nodes two particle filters are used: the bootstrap particle filter and the unscented one, both in the centralised and in the distributed manner. Their performances are compared through simulation with the theoretical lower PCRB. The node selection problem is formulated as a cross-layer energy minimisation problem, whose solution is addressed by a greedy-type algorithm, both in the static scenario and in the dynamic scenario.
Keywords: wireless sensor networks; WSNs; collaborative tracking; mobile nodes; particle filters; energy efficiency; cross-layer optimisation; sensor collaboration; wireless networks; target tracking; node selection; energy consumption.
International Journal of Sensor Networks, 2011 Vol.9 No.3/4, pp.124 - 138
Received: 05 Mar 2010
Accepted: 26 Jul 2010
Published online: 22 May 2011 *