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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/35014

    Title: 無線感測網路中具模糊位置資訊之定位及繞徑技術
    Other Titles: Accuracy-enhanced localization and routing based on inaccurate location information in WSNs
    Authors: 呂昀融;Lu, Yun-jung
    Contributors: 淡江大學資訊工程學系資訊網路與通訊碩士班
    張志勇;Chang, Chih-yung
    Keywords: 無線感測網路;模糊位置資訊;位置知覺之繞徑演算法;方格位置資訊;Wireless sensor networks;Inaccuracy Location Information;Location-Aware Routing Protocol;Bounding Box
    Date: 2008
    Issue Date: 2010-01-11 05:54:02 (UTC+8)
    Abstract: 在無線感測網路中,現存的繞徑協定、資料儲存技術及物件追蹤技術均假設Sensor Node具有精準的位置資訊,然而,就現今所提出之各種定位技術而言,仍無法使Static Sensor Node具有精準的位置資訊,近年來已有許多Bounding Box的定位技術被提出,其主要利用攜帶位置資訊的Mobile Anchor不斷移動,並定期發送其位置資訊,以協助其鄰近的Static Sensor Node定位,然而,由於Static Sensor Node所儲存的位置資訊為一矩形的模糊位置,這將造成Sensor Node無法區別其與鄰近Sensor Nodes在東西南北方位上的相對關係,相對位置的不確定將使目前廣為應用的具位置感知繞徑協定位置以及現存的物件追縱技術其效能顯著低落。本論文對Bounding Box定位技術所衍生的相對位置模糊關係詳加討論及分析,並在不改變發送Beacon之位置及數量的條件下,提出分散式的方法來協助Static Sensor Node改善其與鄰近Sensor Node相對位置的辨別度,此外,我們亦提出一繞徑協定以克服不精確位置所產生的繞徑問題。效能分析及實驗顯示,以本論文所提出定位技術的確可顯著改善鄰近Sensor Node間的相對位置辨別度,此技術與現有具位置感知之繞徑協定搭配使用將可大幅改善繞徑效能,而搭配本論文所提出之定位技術及具模糊位置感知之繞徑技術,將可再更進一步改善繞徑的效能。
    Location information has been proven to be very useful in the design of sensor network infrastructures. First of all, a sensor network is “data-centric”. The data sensed by sensor networks are meaningless if we don’t know where the data are from. Location information can also help routing. However, it is still a big challenge to provide each sensor with accurate location information. Many localization mechanisms developed based on the bounding box concept have been proposed. Each sensor that receives the location beacons from mobile anchor can construct a rectangle box representing its possible location region. However, the bounding box approaches can not identify the relative locations for neighboring sensors based on the inaccurate location information. Furthermore, the well-known location-aware routing can only be applied in the network environment where each sensor has accurate location information. The performance of location-aware routing will be significantly dropped when it is applied in an inaccurate location environment. This paper aims to improve the location accuracy of each sensor and help the neighboring sensors to identify their relative locations by using the unused location beacons. In addition, a location-aware routing mechanism that is operated in an inaccurate location environment is proposed to improve the routing performance. Simulation study reveals that the proposed localization mechanisms improve the location accuracy and identify the relative location of sensors while the proposed location-aware routing mechanism reduces the average route length and hence prolongs the network lifetime.
    Appears in Collections:[Graduate Institute & Department of Computer Science and Information Engineering] Thesis

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