tailieunhanh - Báo cáo hóa học: " Research Article Fault-Tolerant Target Localization in Sensor Networks"

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 Fault-Tolerant Target Localization in Sensor Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 96742 9 pages doi 2007 96742 Research Article Fault-Tolerant Target Localization in Sensor Networks Min Ding 1 Fang Liu 1 Andrew Thaeler 1 Dechang Chen 2 and Xiuzhen Cheng1 1 Computer Science Department The George Washington University Washington DC 20052 USA 2 Division of Epidemiology and Biostatistics Department of Preventive Medicine and Biometrics Uniformed Services University of the Health Sciences Bethesda MD 20817 USA Received 21 July 2006 Revised 8 November 2006 Accepted 13 November 2006 Recommended by Wei Li Fault-tolerant target detection and localization is a challenging task in collaborative sensor networks. This paper introduces our exploratory work toward identifying the targets in sensor networks with faulty sensors. We explore both spatial and temporal dimensions for data aggregation to decrease the false alarm rate and improve the target position accuracy. To filter out extreme measurements the median of all readings in a close neighborhood of a sensor is used to approximate its local observation to the targets. The sensor whose observation is a local maxima computes a position estimate at each epoch. Results from multiple epoches are combined together to further decrease the false alarm rate and improve the target localization accuracy. Our algorithms have low computation and communication overheads. Simulation study demonstrates the validity and efficiency of our design. Copyright 2007 Min Ding 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. 1. INTRODUCTION The development of wireless sensor networks provides many exciting applications including roadway safety warning 1 habitat monitoring 2 smart classroom 3 and so forth. Such networks rely on the collaboration