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  1. Proceedings of the 6th Latin America Networking Conference (LANC '11)
  2. Hybrid RSS/TOA wireless positioning with a mobile anchor in wireless sensor networks
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Hybrid RSS/TOA wireless positioning with a mobile anchor in wireless sensor networks ( LANC '11 )

Content Provider ACM Digital Library
Author Kim, Yeong-Sam Kim, Dae-Kyung Chong, Jong-Wha
Abstract In this paper, we propose a novel hybrid RSS/TOA positioning algorithm with a mobile anchor, which follows a spiral trajectory to cover the whole region of the wireless sensor networks (WSN). The conventional time of arrival (TOA) positioning algorithms have two considerable accuracy problems. Firstly, as the distance between the reference node and the sensor increases, its accuracy is degraded gradually. Secondly, when an obstacle exists between the reference node and the sensor, its accuracy is degraded greatly. In our proposed algorithm, the mobile anchor, which plays the same role as the reference node, moves on a spiral trajectory and transmits its signal periodically. The received signal strength (RSS) is utilized by the sensor not only to compute whether it is closed enough to the mobile anchor or not but also to distinguish the obstacle. As a result, the measurement range of the TOA ranging process is restricted within the interval of two adjacent spiral curves. Under the circumstance that no obstacle exists between the mobile anchor and the sensor, the TOA ranging process and the proposed two-step positioning calculation are operated to estimate the position of the sensor accurately. Simulations are performed to compare the performance of the proposed hybrid RSS/TOA positioning algorithm with the performance of the conventional TOA least square estimating positioning algorithm (TOA_LSE). Simulation results show that the average positioning error is reduced by 48.2% and the standard deviation of the positioning errors is reduced by 71.3%.
Starting Page 25
Ending Page 32
Page Count 8
File Format PDF
ISBN 9781450308861
DOI 10.1145/2078216.2078222
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2011-10-12
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Received signal strength Hybrid positioning Mobile anchor Time of arrival
Content Type Text
Resource Type Article
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