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研究生:謝旻岳
研究生(外文):Ming-Yeuh Hsiesh
論文名稱:行動通訊系統中基於訊號到達時間差值的無線定位技術研究
論文名稱(外文):TDOA Based Wireless Geolocation Technology for Mobile Cellular Systems
指導教授:蔡育仁蔡育仁引用關係
指導教授(外文):Yuh-Ren Tsai
學位類別:碩士
校院名稱:國立清華大學
系所名稱:通訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:76
中文關鍵詞:無線定位訊號到達時間差值
外文關鍵詞:wireless locationTDOA
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無線通訊系統之發話者定位功能的應用一直持續的增加,因此,無線定位之演算法也持續地發展與改進。大部分的無線定位演算法是基於以下四個原則來達成無線定位的功能:訊號到達時間,訊號到達時間差值,接收訊號強度以及訊號到達角度。
在無線定位系統裡,手機位置估計誤差的來源主要有兩種:第一種誤差來源是由於用來無線定位的基地台與手機之間的時脈物能夠同步所造成的誤差。然而這個問題可以被以到達時間差值為基礎的無線定位演算法所解決。第二種誤差來源是由於非直線傳遞訊號所造成的,而非直線傳遞訊號在無線通訊環境裡是非常容易發生的。因此無線定位系統必須花費較多的心力在降低由於非直線傳遞訊號所造成的手機位置估測誤差。
在無線定位系統裡,手機位置估計誤差的來源主要有兩種:第一種誤差來源是由於用來無線定位的基地台與手機之間的時脈物能夠同步所造成的誤差。然而這個問題可以被以到達時間差值為基礎的無線定位演算法所解決。第二種誤差來源是由於非直線傳遞訊號所造成的,而非直線傳遞訊號在無線通訊環境裡是非常容易發生的。因此無線定位系統必須花費較多的心力在降低由於非直線傳遞訊號所造成的手機位置估測誤差。

有許多無線定位演算法是以最小平方法來達成無線定位功能。在此論文中,亦是使用最小平方法。然而與其他方法不同的是,本論文中的最小平方法是實現在訊號延遲時間上,並藉由訊號到達時間差值的原則,可以使用具有限制的最小平方法。如此一來,解空間可以變小。而其他方法所使用的最小平方法是實現在手機地理位置上,因此,解無法有任何的限制。
Applications of finding location for the subscribers using wireless services continue to expand. Therefore, many wireless location algorithms were devel-oped. Most of the wireless location algorithms were based on principles of Time of Arrival (TOA), Time Difference of Arrival (TDOA), Signal Strength or Angle of Arrival (AOA) to estimate the position of the mobile phone.
There are two major error sources in wireless location systems. One is the error due to the clock asynchronization between the base station and the mobile phone. However, the problem could be solved by the location algorithms based on TDOA. The other major location estimation error source is non-line-of sight (NLOS) error which is very common in the signal propagation environment. So that the wireless location system should put more effort to overcome the inac-curacy due to the NLOS errors.
To mitigate the estimation error due to NLOS, many wireless location sys-tems use methods that apply least square approach on mobile position to esti-mate the mobile phone position. In this thesis, we apply an alternative least square approach on delays and set up several appropriate constraints on delays to reduce the solution space.
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