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Mathematical Problems in Engineering
Volume 2015, Article ID 627479, 11 pages
http://dx.doi.org/10.1155/2015/627479
Research Article

Energy-Efficient Node Scheduling Method for Cooperative Target Tracking in Wireless Sensor Networks

School of Information Science and Engineering, Central South University, Changsha 410075, China

Received 25 July 2014; Revised 13 October 2014; Accepted 15 October 2014

Academic Editor: Wei Zhang

Copyright © 2015 Weirong Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Using the sensor nodes to achieve target tracking is a challenging problem in resource-limited wireless sensor networks. The tracking nodes are usually required to consume much energy to improve the tracking performance. In this paper, an energy-efficient node scheduling method is proposed to minimize energy consumption while ensuring the tracking accuracy. Firstly, the Kalman-consensus filter is constructed to improve the tracking accuracy and predict the target position. Based on the predicted position, an adaptive node scheduling mechanism is utilized to adjust the sample interval and the number of active nodes dynamically. Rather than using traditional search algorithm, the scheduling problem is decomposed to decouple the sample interval and number of nodes. And the node index is mapped into real domain to get closed-form solution to decide the active nodes. Thus, the NP-complete nature is avoided in the proposed method. The proposed scheduling method can keep the tracking accuracy while minimizing energy consumption. Simulation results validate its effective performance for target tracking in wireless sensor networks.