ALGORITHMS FOR SENSOR COVERAGE AND SENSOR LOCALIZATION PROBLEMS IN WIRELESS SENSOR NETWORKS By XIAOCHUN XU A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY

Abstract

of Dissertation Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy ALGORITHMS FOR SENSOR COVERAGE AND SENSOR LOCALIZATION PROBLEMS IN WIRELESS SENSOR NETWORKS By Xiaochun Xu August 2008 Chair: Sartaj Sahni Major: Computer Engineering Recent advances in sensor technology coupled with embedded systems and wireless networking have made it possible to deploy sensors for numerous applications including monitoring microclimates and wildlife habitats, the structural integrity of bridges and buildings, building security, location of valuable assets, traffic, and so on. Among a variety of the essential algorithmic issues that arise in the context of wireless sensor networks, we investigate (1) sensor deployment algorithms for point/region coverage problems, and (2) sensor localization algorithms for the problem of estimating the location of a source in the plane. An integer linear programming (ILP) formulation is developed to find the minimum cost deployment of sensors that provides the desired coverage of a target point set. We also propose a greedy heuristic for this problem. Our formulation permits heterogeneous multimodal sensors and is extended easily to account for nonuniform sensor detection resulting from blockage, noise, fading, and so on. A greedy algorithm for solving the proposed general ILP is developed. Additionally, 2-approximation algorithms and a polynomial time approximation scheme are proposed for the case of grid coverage. Experiments demonstrate the superiority of our proposed algorithms over earlier algorithms for point coverage of grids by using heterogeneous sensors. We propose a factor 3 approximation algorithm and a polynomial time approximation scheme for the problem of sensor deployment that provides the desired coverage over the

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@inproceedings{Xu2008ALGORITHMSFS, title={ALGORITHMS FOR SENSOR COVERAGE AND SENSOR LOCALIZATION PROBLEMS IN WIRELESS SENSOR NETWORKS By XIAOCHUN XU A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY}, author={Xiaochun Xu and Ravindra K. Ahuja}, year={2008} }