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標題: | GPS和Galileo雙衛星軟體接收機之可適性波束成型設計 Design of a Software GPS-Galileo Receiver with Adaptive Beamforming |
作者: | I-Jui Chu 朱怡睿 |
指導教授: | 闕志達(Tzi-Dar Chiueh) |
關鍵字: | 全球衛星定位系統,伽利略衛星定位系統,軟體接收機,波束成型, GPS,Galileo,software receiver,beamforming, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 近幾年來,由於行動電子產品的普遍性與便利性越來越高,一般民眾對於其附加功能的要求亦隨之提升,其中”衛星導航定位服務”已幾乎成為必備要素之一。因此,無論是車用、手持式或是智慧型手機、隨身電腦等的導航定位系統,都希望可以提供高準確度、高穩定性、高效率的衛星定位服務,以滿足所有消費者的共同需求與期待。目前由美國發展的全球定位系統(GPS)最為成熟,免費提供任何人在任何位置皆可使用此服務,而歐盟為了避免衛星導航市場被美國壟斷,也正積極建立其獨立的衛星導航系統,稱之為伽利略(Galileo)系統。
本論文兼併目前正在建立的Galileo衛星系統和發展已成熟的GPS衛星系統之優點,利用其彼此相容的特性,建立一雙衛星軟體基頻接收機,增加使用者定位的準確度和整體效能。而相容的雙衛星系統也意謂著接收機將同時取得並處理兩系統的訊號,但必須注意個別衛星系統間不能互相干擾,以免影響到另一系統的訊號處理。因此,本研究將完整實現GPS和Galileo衛星訊號的處理過程,並克服雙衛星系統同時處理將面對到的各種問題,以提供接收機更高準確度的定位服務。另外,為了解決訊號在傳送過程中容易受到外界干擾使接收機收到的訊號相當微弱,本論文利用雙天線波束成型技術提升訊號之訊雜比,使接收機可收到更多穩定的衛星訊號。最後,本論文將以實際錄製的衛星訊號展現此雙衛星軟體基頻接收機之成果。 In recent years, due to the popularity and convenience of mobile electronic products, the requirements of additional features increase, especially in “satellite navigation service.” Therefore, in order to meet the demands and expectations of all users, the navigation system is expected to provide high accuracy, high stability, and high efficiency in automobile electronics, handheld devices, smart phones, and portable computers. Currently, the most well-established navigation satellite system is Global Positioning System (GPS) which is developed by the U.S. and free to anyone everywhere. For the purpose of avoiding the monopoly of the U.S. satellite navigation market, the European Union is building its own independent satellite navigation system called Galileo system. Combining the advantages of Galileo and GPS satellite systems and using the interoperability between these systems, the dual satellite software baseband receiver is proposed to increase the positioning accuracy and performance. These two satellite systems are interoperable with each other, so that the receiver could receive and process these two signals simultaneously. Besides, the mutual interference has to be carefully avoided. Therefore, this research completely implements the GPS and Galileo satellite signal processing and overcomes the problem of the two satellite systems to provide higher accuracy positioning services. In addition, the signal susceptible to interference during transmission makes the receiver receive very weak signal. For this problem, the slolution is to use dual-antenna beamforming techniques which enhance the signal SNR, so the receiver would receive more robust satellite signals. Finally, the recording of the actual satellite signals are used to verify the receiver. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/16459 |
全文授權: | 未授權 |
顯示於系所單位: | 電子工程學研究所 |
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