以無線訊號強度輔助GPS之群組定位技術; Group Positioning Technology Using GPS with Auxiliary Radio Signal Strength

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題名:	以無線訊號強度輔助GPS之群組定位技術;Group Positioning Technology Using GPS with Auxiliary Radio Signal Strength
作者:	林柏旻;Po-Min Lin
貢獻者:	通訊工程研究所
關鍵詞:	群組;訊號強度;藍芽;全球衛星定位系統;Signal Strength;Bluetooth;Group;GPS;Location Estimation
日期:	2011-08-09
上傳時間:	2012-01-05 14:52:10 (UTC+8)
摘要:	由於無線通訊科技的迅速發展，連帶著使以定位為基礎的適地性服務 (Location-Based Service, LBS) 在商業、公眾安全與軍事上的應用也博得青睞。適地性服務是一種以位置為基礎所提供的行動服務，主要應用包括尋找鄰近資訊、行人導航、汽車導航、人身安全、人員與車隊管理、社群交友、區域廣告等，導航只是最常見的應用之一。而不論是戶外或室內的定位技術，其最大爭議便是定位的精確度，目前已經有許多文獻報告提供可利用或已應用之定位演算法。其中針對戶外定位系統服務部分，全球衛星定位系統（GPS）是室外定位技術中最成熟的。 GPS與全球導航衛星系統（GLONASS）逐步增加新的頻段和更新衛星，以及伽利略（Galileo）、北斗二號（CNSS）、準天頂衛星系統（QZSS）與歐洲同步衛星導航覆蓋服務（EGNOS）等新興衛星導航的建置，使得全球導航衛星系統技術已日趨普及。然而任何一種行動服務應用都依靠著識別使用者所在的位置為基礎，但 GPS 仍存在著直視性（Line of Sight, LoS）限制，在室外有遮蔽物時，定位精準度將會嚴重受到影響，甚至會因為收不到衛星訊號，導致定位精準度嚴重降低，尤其在建築物密集的都會地區更是明顯。因此，本論文利用IEEE 802.15.1 – Bluetooth的短距離傳輸特性來輔助 GPS 定位。在研究中，行動裝置透過 Bluetooth 互相交換定位資訊(如:經緯度) 並透過訊號強度推算距離，用來修正群組間成員的距離誤差。本論文提出一個新穎的群組定位方式，提供高精準群組定位的相對位置評估。本論文針對需要群組定位的應用，例如腳踏車車隊、登山隊等，提出利用 GPS 搭配藍芽通訊提高精準度，提供群組間定位精準的相對位置資訊。 As the rapid development in wireless technology, Location-Based Service (LBS) is widely used in the various areas; civil navigation, public safety, and military. It provides many mobile services; neighbor information searching, pedestrian navigation, personal security, personnel and fleet management, location status of friends, and regional advertising. Navigation is one of the most common applications. However, any kind of LBS is relying on to identify the user’s location. When developing the indoor or outdoor positioning algorithm, the accuracy is the primary concern. Several useful positioning algorithms have been published for performing LBS. In open sky environments, Global Navigation Satellite System (GNSS) is the well-known navigation system. GNSS is the generic name given to the satellite-based navigation systems including global positioning system (GPS), global navigation satellite system (GLONASS), and Galileo. When using GPS without extra assistance, such as A-GPS or indoor GPS beacon, there are some existing drawbacks; for example, the precision will be degraded in the Non-Line-of-Sight (NLoS) environment such as dense metropolis, and the location will not be able to perform in the weak signal environment such as indoor. In order to solve the problem and improve the positioning accuracy, the mobile devices use Bluetooth to exchange GPS iv position information (such as: latitude and longitude) and use signal strength of Bluetooth to estimate the distance between the group members. This thesis proposes using GPS with auxiliary Bluetooth signal strength to improve the accuracy of position to provide relative permutation between the group members. We propose a group positioning algorithm to obtain the relative permutated location, which is particularly used for application such as a bicycle team, climber team and so on.
顯示於類別:	[通訊工程研究所] 博碩士論文

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