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研究生:陳宗裕
研究生(外文):Chen Tsung-Yu
論文名稱:無線手機定位系統分析與研究
論文名稱(外文):Study and Analysis on Wireless Mobile Position Systems
指導教授:丘建青
指導教授(外文):Chiu Chien-Ching
學位類別:碩士
校院名稱:淡江大學
系所名稱:電機工程學系
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:2003
畢業學年度:91
語文別:中文
論文頁數:72
中文關鍵詞:手機定位抵達角度抵達時間非視線傳播
外文關鍵詞:Mobile PositionAOATOANon-Line-of-Sight
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在過去幾年無線手機定位系統成為一個很熱門的問題在我們的無線通訊系統。甚多研究提供以訊號抵達的場強(SS)、訊號抵達的時間(TOA)以及訊號抵達的角度(AOA)在無線系統中作定位的技術。
本論文首先提出一個方法去提高定位的準確度,此方法結合與混合TOA與AOA的技術增加行動台(MS)定位的準確度。數值模擬結果證明此架構比單一使用TOA與AOA 技術其準確度來的好。
在無線手機定位系統中,主要的技術挑戰是訊號為非視線(NLOS)傳播效應,在本文也針對非視線傳播效應問題進行研究。我們提出一個在抑制NLOS所造成MS估計誤差的演算法則,分別應用AOA與TOA的定位技術。最後,經由電腦模擬結果顯示我們提出的演算法則均能有效抑制NLOS效應。
The mobile position location has become a hot issue over the past few years in wireless communication. The Signal strength (SS), The Angle of Arrival (AOA) and Time of Arrival (TOA) techniques have been proposed for providing location services in wireless mobile position systems.
In this paper we present a method for the enhanced accuracy of mobile location. This method is to mix and combine AOA and TOA in wireless mobile position system and to pick out mobile locations to enhance the accuracy of location estimation. Numerical results demonstrate that the proposed location scheme gives much higher location accuracy than the method that only uses TOA or AOA location technique.
The major technical challenge is Non-Line-of-Sight (NLOS) problems in the wireless mobile position system. In this thesis, we focus on the NLOS mitigation issue. NLOS mitigation algorithms are proposed to combat such NLOS errors based on TOA and AOA position techniques. Finally, the performance of the proposed algorithm is evaluated by computer simulations. Simulation results show that the proposed schemes are effective in decreasing NLOS errors.
目錄
第一章 緒論 ………………………………………………………1
1.1 研究背景與動機……………………………………………1
1.2 論文架構……………………………………………………3
第二章 無線定位原理與無線通道特性…….……………………4
2.1 基地台無線定位系統………………………………………4
2.1.1 訊號強度(Signal Strength)…………………….4
2.1.2 抵達時間(Time of Arrival) ……………………5
2.1.3 抵達時間差(Time Difference of Arrival)……7
2.1.4 抵達角度(Angle of Arrival)……………………9
2.1.5 混和式定位法 (Hybrid Location Methods)……11
2.2 無線通道特性………….……………………………….12
2.2.1 多重路徑傳播 ( Multipath Propagation )……12
2.2.2 非視線傳播 ( NLOS Propagation)………………13
2.2.3 多重接取干擾 ( MAI)…………………………….13
第三章 無線定位演算法………………………………………….15
3.1 TOA定位演算法………………………………………….15
3.1.1 泰勒級數法(Taylor Series)…………………….16
3.1.2 幾何法(Geometric Approaches)…………………18
3.2 AOA定位演算法.…………………………………………21
3.3 混和式定位演算法 (HTAP)…………………………….23
3.4 曲線契合應用在定位系統 (Curve Fitting on Position
System)………………………………………………….23
3.4.1 TOA的曲線契合……………………………………24
3.4.2 AOA的曲線契合……………………………………25
第四章 無線定位系統模擬….….………………………………26
4.1 基地台的配置………………………………………….26
4.2 系統的模型與效能分析……………………………….27
4.2.1 TOA的定位模型………………………………….27
4.2.2 AOA的定位模型…………………………….……29
4.2.3 定位效能分析……………………………………29
4.3 單一位置定位模擬…………………………………….29
4.3.1 模擬的結果討論…………………………………36
4.4 追蹤定位模擬………………………………………….36
4.4.1 行動台路徑………………………………………37
4.4.2 模擬結果討論……………………………………44
4.5 混合與結合TOA與AOA定位…………………………….45
4.5.1 模擬結果討論……………………………………48
第五章 改善非視線傳播效應……………………………………49
5.1 抑制NLOS的演算法在AOA定位系統…………………..49
5.2 AOA定位抑制NLOS的演算法模擬……………………..53
5.2.1 模擬結果討論…………………………………..58
5.3 抑制NLOS的演算法在TOA定位系統…………………..59
5.4 TOA定位抑制NLOS的演算法模擬……………………..63
5.4.1模擬結果討論……………………………………..68
第六章 結論 ……………………………………………………69
參考文獻……………………………………………………………70
參考文獻
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