In-Soo Koo, Cong Tran Xuan, Eun-Chan Kim, Sung-Soo Choi, Journal of Internet Computing and Services, Vol. 9, No. 4, pp. 51-60, Aug. 2008
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Keywords: Wireless Sensor Networks, location detection, distance between nodes, reliability information of distance data

Abstract

In wireless sensor networks, one of most common location detection methods that do not require additional devices such as GPS and ultrasonic sensor, is the location detection method based on received signal strength. However, measured received signal strength will fluctuate over time mainly due to physical radio channel characteristics between nodes, which subsequently will cause errors to measured distance between nodes. Since these contaminated distance data are utilized to detect the location of unknown node, there will be accumulated errors in the location of unknown node. In order to overcome the limitation of the location detection method based on received signal strength, we propose a location scheme in which reliability information of distance data as well as distance data between nodes are utilized to estimate the location of unknown node. Through simulation, it is shown that the proposed scheme can accomplish 30% capacity improvement.

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