Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Error Control in Distributed Node Self-Localization | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 162587 13 pages doi 2008 162587 Research Article Error Control in Distributed Node Self-Localization Juan Liu and Ying Zhang Palo Alto Research Center 3333 Coyote Hill Road Palo Alto CA 94304 USA Correspondence should be addressed to Juan Liu jjliu@ Received 31 August 2007 Accepted 7 December 2007 Recommended by Davide Dardari Location information of nodes in an ad hoc sensor network is essential to many tasks such as routing cooperative sensing and service delivery. Distributed node self-localization is lightweight and requires little communication overhead but often suffers from the adverse effects of error propagation. Unlike other localization papers which focus on designing elaborate localization algorithms this paper takes a different perspective focusing on the error propagation problem addressing questions such as where localization error comes from and how it propagates from node to node. To prevent error from propagating and accumulating we develop an error-control mechanism based on characterization of node uncertainties and discrimination between neighboring nodes. The error-control mechanism uses only local knowledge and is fully decentralized. Simulation results have shown that the active selection strategy significantly mitigates the effect of error propagation for both range and directional sensors. It greatly improves localization accuracy and robustness. Copyright 2008 J. Liu and Y. Zhang. 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. 1. INTRODUCTION In ad hoc networks location information is critical to many tasks such as georouting data centric storage spatio-temporal information dissemination and collaborative signal processing. When global positioning system GPS is
