在無線感測網路中運作在模糊位置資訊下之錯誤位置偵測、更正及繞徑技術

淡江大學機構典藏 > 工學院 > 資訊工程學系暨研究所 > 學位論文 > Item 987654321/34987

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题名:	在無線感測網路中運作在模糊位置資訊下之錯誤位置偵測、更正及繞徑技術
其它题名:	Joint location-error detection, correction and routing for wireless sensor networks
作者:	楊博安;Yang, Po-an
贡献者:	淡江大學資訊工程學系碩士班黃連進;Huang, Lain-jinn
关键词:	無線感測網路;移動定位機器;繞徑;錯誤偵測;錯誤修正;Wireless sensor networks;localization mobile anchor;routing;error detection;error correction
日期:	2007
上传时间:	2010-01-11 05:52:08 (UTC+8)
摘要:	在無線感測網路中，正確的位置資訊將有助於計算覆蓋率並在建立繞徑時可大量減少control overhead。近年來已有許多研究提出以具有位置資訊(如裝設全球定位系統GPS)的 mobile anchor移動並廣播其位置資訊以協助其他static sensor定位，每個static sensor藉由收到的廣播均可確認其位置落在ㄧ矩形位置區域，因此其具有一模糊的位置資訊。然而在戶外的環境當中，由於風吹、敵軍惡意破壞或是動物遷移等因素皆可能使已具有模糊位置資訊的static sensor更動，致使許多static sensor紀錄錯誤的位置而不自知。當sensor的位置為一模糊位置或是更甚錯誤時，現存的Location Aware Routing Protocol均無法正常的運作。本論文將以分散式的技術偵測並修正錯誤的位置資訊，使sensors記錄正確的位置資訊，以提高網路繞徑的效能，之後，我們將進一步探討模糊位置對現有的Location Aware Routing Protocol的影響與衝擊，並且提出ㄧ分散式繞徑技術使其可運作於模糊位置資訊之下，改善現存Location Aware Routing Protocol的封包傳送成功率。實驗顯示，我們提出的分散式偵測與修正技術可以找出記錄錯誤位置的sensors並且修正之，我們所提出的分散式繞徑演算法也能提高封包的成功到達率，使得繞徑的效能大幅改善。 The accurate location information is more important to estimate the coverage and reduce the control overhead of routing in wireless sensor networks. Recently, some researches [13][14][15] propose the locating mechanism applying the mobile anchor equipped with the Global Position System (or GPS for short) to achieve the accuracy of localization for the static sensors in the WSNs (Wireless Sensor Networks)[1]. Each static sensor can estimate or adjust the bounding box which bounds its real location by receiving the location information broadcasted by the mobile anchor and hence can address its estimated location. However, the estimated location of each static sensor is easy to become incorrect since some abrupt accidents, such as strong breeze, malicious remove or animal movement, will cause the estimated location fall into location error. The location error will increase the control overhead for the location aware routing protocol or furthermore result routing fault. This paper proposes a distributed location-error detection and correction mechanism to prevent the location errors from the accidents and hence improve the routing performance. Simulation results show that the proposed protocols can make the sensors which have location error aware that mistakes correct the error, and therefore significantly reduce the control overheads of routing and average routing length.
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