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卓忠志-以GSM為基礎之室外自動定位之研究
[ 摘要 ]
近年來由於行動通訊的快速成長，各種與行動通訊有關的應用不斷增加，尤其是定位的服務。這種定位技術多是透過基地台與後端的網路設備傳送位置資訊，再以各種定位法來定出使用者端的正確位置。這類技術的缺點在於定位的資料流佔用了有限的頻寬，使原本頻寬就不足的網路更加吃緊，換句話說，設備正常服務與定位服務彼此間造成排擠，定位服務的普及與利用率便大打折扣，由此看來，一個定位技術應該是獨立運作於使用者端，定位資訊不必藉由網路傳輸，如此才不會佔用原本正常服務的頻寬，也不必更動原有系統架構。
本篇論文實作一種架構在使用者端的自我定位系統，以GSM提供的TA(time advance)值來達成定位的需求。完全不需依賴第三者(系統服務業者)的以GSM為基礎的室外定位系統，不須更改GSM 系統的整體架構、不需向系統服務業者繳交費用，又可以達到定位要求。
[ 英文摘要 ]
Due to the availability of the cellular phone, the use of Mobil Communication Services has quickly grown beyond what anyone had imagined,especially on location services. Our main proposal in this paper is implement a wireless position location through a single cellular phone. This system has the following two features: First, it does not require any modification to the current GSM (Global System for Mobile Communication) architecture, that is, it does not increase network traffic. Second, the location identifications is performed on the mobile end, which does not increase computation load of the network system.
The intention of this paper is to introduce innovation uses single cellular phone to implement ALI (Automatic Location Identification) system. The whole issue determining the TA (Timing Advance) between the MS (Mobile Station) and the BTS (Base Transference Station) as well as coupling the calculated distance with the determined direction of the BTS signal so as to calculate the location of the MS.
