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研究生(外文):Chiu Li-Yen
論文名稱(外文):A Study on Handset Position Estimation by Signal Strength of Arrival
指導教授(外文):Lou Pi-Ching
外文關鍵詞:Mobile PositionCell-ID
  • 被引用被引用:2
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  In the presently mobile position technology, GPS's position method is one of the best. This method owns high accuracy less than 15 meters, and can be used with GPS chip in the mobile station. But GPS chip with the high price makes this technology difficult to popular. Therefore, the position technology of GSM communication network is attention to the people gradually. TOA or AOA is more often used among position technology, these methods need only the help of the position measuring instrument to attain time and angle for position calculation. They have good position accuracy, but they are also too expensive to popular. Every positioning technology has its bottleneck such as external environment influence, cost and positing efficiency. Therefore, the purpose of this research lies in finding out the mobile station location and does not emphasize the raise of the accuracy and it only uses existing information to finish position action.

  We propose to use the Cell-ID parameter to estimate the area that mobile phone location. According to the signal strength from the received station, fetch three pieces of largest signal strength. Signal attenuation model converts the three signal strength of each channel to the distance between mobile and receive stations. It first uses least squares method to deal with distance from observation, and purposes to minimize position error, then it uses gradient gescent position algorithm to calculate the estimating location of the mobile station. The position method is compared with the longitude and latitude information of GPS position equipment and positioning error is about 60 meters. According to this result, this position method has been proved to find out the rough location. In addition, the simulation program is also designed to simulate the feasibility of system in this research. First, the program is preceding base station distribution. From the result of simulation, there are not obviously differences between two base stations. Secondary, the program is preceding different signal strength under a location of the same base station. From the result of simulation, signal strength can influence result of position, but its changes can be maintained in a certain range.
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機 3
1.3 研究目的 4
1.4 研究流程 5
1.5 研究架構 6
1.6 研究方法 6
第二章 無線行動通訊概述 9
2.1 全球無線行動通訊發展歷程 9
2.1.1 蜂巢行動電話系統 10
2.1.2 無線電話系統 11
2.2 我國無線行動通訊發展歷程與現況 11
2.3 第三代行動通訊產業的發展現況 13
2.4 泛歐式系統(GSM)介紹 14
2.4.1 GSM系統規格 14
2.4.2 GSM使用頻段 16
2.4.3 GSM系統架構 16
2.4.4 GSM通訊系統的邏輯通道 19
2.4.5 GSM通訊系統相關的特性 22
第三章 行動定位技術 26
3.1 全球定位系統 26
3.1.1 GPS的原理 27
3.1.2 GPS構成 28
3.1.3 GPS的應用 29
3.1.4 GPS系統的誤差來源 30
3.2 協助式全球定位技術 32
3.3 無線基地台定位技術 35
3.3.1 信號到達時間 35
3.3.2 信號到達時間差 36
3.3.3 增強測量時間差 38
3.3.4 時間提前 40
3.3.5 細胞識別碼 41
3.3.6 頻道信號強度 42
3.3.7 信號到達角度 44
3.3.8 資料庫相關法 45
3.3.9 混合型 45
第四章 無線通道模型 47
4.1 無線通道 47
4.2 傳播路徑衰減模型 49
4.2.1 自由空間傳播模型 49
4.2.2 對數距離路徑衰減模型 50
4.3 大尺度傳播模型 52
4.3.1 遮蔽效應與對數-常態分配 52
4.4 小尺度傳播模型 53
4.4.1 多重路徑效應影起的延遲擴展 54 多重路徑效應 54 延遲擴展及功率延遲概觀 55 時散參數 56 同調頻寬 58 寬頻系統與窄頻系統 59
4.4.2 都普勒效應造成的頻率偏移 63 都普勒偏移及同調時間 63 緩慢衰減及快速衰減 64
第五章 研究模擬的設計與分析 67
5.1 訊號衰減的因素及應用 67
5.2 定位演算法分析 69
5.3 系統模擬工具的設計和執行 78
5.4 不同基地台分佈位置定位的分析 85
5.5 訊號強度定位的分析 88
第六章 結論 96
參考文獻 98
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