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    題名: Distributed direction-based localization in wireless sensor networks
    作者: Wang, Sheng-Shih;Shih, Kuei-Ping;Chang, Chih-Yung
    貢獻者: 淡江大學資訊工程學系
    關鍵詞: Wireless sensor networks (WSNs);Localization;Range-free;Direction-based localization scheme (DLS)
    日期: 2007-03
    上傳時間: 2011-10-05 22:19:51 (UTC+8)
    出版者: Amsterdam: Elsevier BV
    摘要: Location awareness is an attractive research issue in the wireless sensor network (WSN). However, precise location information may be unavailable due to the constraint in energy, computation, or terrain. Additionally, several applications can tolerate the diverse level of inaccuracy in such geographic information. Thus, this paper presents a direction-based localization scheme, DLS, whose main goal is for each sensor to determine its direction rather than its absolute position. The direction we are concerned with is the one relative to the sink. Motivated by the proposed spatial locality property, DLS considers multiple messages received for a sensor to determine its direction. Furthermore, a novel scheme, anchor deployment strategy, is also proposed for the improvement of the estimated correctness in direction of the sensor within the communication range of the sink. With the aid of the virtual dual direction coordinate (VDDC) system, DLS is able to efficiently and precisely position sensors around the axes. We evaluate DLS via simulations in terms of various numbers of sensors and communication ranges for the scenarios with different numbers of directions. The average correct rates in DLS reach approximately 94%, 86%, and 81% for the networks with 4, 8, and 16 directions, respectively. DLS achieves outstanding performance for the high density networks as well. In addition, DLS also works well regardless of the sink placement. Overall, simulation results validate the practicality of DLS, and show that DLS can effectively achieve direction estimation.
    關聯: Computer Communications 30(6), pp.1424–1439
    DOI: 10.1016/j.comcom.2007.01.002
    顯示於類別:[資訊工程學系暨研究所] 期刊論文

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