| 研究生: |
蕭宗正 Hsiao, Zong-Jheng |
|---|---|
| 論文名稱: |
GPS基頻訊號處理及導航解算之研究 Analysis of GPS Baseband and Navigation Processing |
| 指導教授: |
莊智清
Juang, Jyh-Ching |
| 學位類別: |
碩士 Master |
| 系所名稱: |
電機資訊學院 - 電機工程學系 Department of Electrical Engineering |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 79 |
| 中文關鍵詞: | 定位誤差 、衛星訊號 、導航解算 |
| 外文關鍵詞: | navigation, acquisition, gps, track, pull-in, confirm |
| 相關次數: | 點閱:74 下載:6 |
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近年來,全球衛星定位系統 (Global Positioning System,GPS) 之架構與其應用已達成熟階段,然而主要面臨困難為:衛星搜尋至鎖定時間、電力耗損、穩定性及定位精度,本文利用一GPS接收模組搭配軟體分析以改善GPS基頻訊號與導航解算程序。基頻訊號處理部份中,根據以往文獻提出不同衛星搜尋法則,比較其衛星由搜尋至鎖定時間,本文並提出予以改善之方法;亦利用此平台完成多路徑訊號之偵測藉以抑制定位誤差。導航解算程序中,本文結合虛擬衛星發射器獲得額外觀測量,提升接收器於遮蔽環境工作時之穩定性;於導航解算則分別加入卡爾曼濾波器及Particle Filter改善原先定位精度。
In recent years, the GPS position technique has been widely used in commercial and portable devices. However, issues such as: Time-To-First-Fix (TTFF), power consumption, receiver stability and positioning accuracy remain to be fully investigated especially when signals are weak and subject to multipath. The thesis establishes a GPS receiver system based on open source software to analyze GPS baseband and navigation function. The thesis compares different acquisition methods and proposed a concept to reduce TTFF in processing of baseband signal. Furthermore, by modification of firmware, multipath signal can be detected, and then it helps suppress position error. In navigation processing, combination of receiver platform and pseudollite is to enhance stability and usability in urban canyons is investigated. A Kalman filter and a Particle filter which continuously update the best estimate of the user position is adding to navigation solution.
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