Title :
An RF-Based System for Tracking Transceiver-Free Objects
Author :
Zhang, Dian ; Ma, Jian ; Chen, Quanbin ; Ni, Lionel M.
Author_Institution :
Dept. of Comput. Sci. & Eng., Hong Kong Univ. of Sci. & Technol., Kowloon
Abstract :
In traditional radio-based localization methods, the target object has to carry a transmitter (e.g., active RFID), a receiver (e.g., 802.11x detector), or a transceiver (e.g., sensor node). However, in some applications, such as safe guard systems, it is not possible to meet this precondition. In this paper, we propose a model of signal dynamics to allow tracking of transceiver-free objects. Based on radio signal strength indicator (RSSI), which is readily available in wireless communication, three tracking algorithms are proposed to eliminate noise behaviors and improve accuracy. The midpoint and intersection algorithms can be applied to track a single object without calibration, while the best-cover algorithm has potential to track multiple objects but requires calibration. Our experimental test-bed is a grid sensor array based on MICA2 sensor nodes. The experimental results show that the best side length between sensor nodes in the grid is 2 meters and the best-cover algorithm can reach localization accuracy to 0.99 m
Keywords :
radio tracking; wireless sensor networks; MICA2 sensor nodes; RF-based system; active RFID; best-cover algorithm; intersection algorithms; noise behavior elimination; radio signal strength indicator; radio-based localization methods; receiver; transceiver; transceiver-free object tracking; wireless communication; Active RFID tags; Calibration; Detectors; Object detection; Radio transmitters; Radiofrequency identification; Receivers; Sensor arrays; Target tracking; Transceivers;
Conference_Titel :
Pervasive Computing and Communications, 2007. PerCom '07. Fifth Annual IEEE International Conference on
Conference_Location :
White Plains, NY
Print_ISBN :
0-7695-2787-6
DOI :
10.1109/PERCOM.2007.8