本論文探討GPS系統受到惡意干擾時之性能。GPS定位已普遍應用在我們日常生活中。但是對於特定任務需求如飛機降落，GPS之導航系統要求要較高之精度、整體性及妥善率，惡意干擾會造成GPS定位品質之惡化。本論文著眼於GPS接收器自主偵測及使用者等校誤差之模型之計算與分析，並進一步探討有無加入虛擬衛星所提供額外觀測量對台灣地區之GPS妥善率之影響。最後探討具可變導航資料輸出的虛擬衛星發射器的設計，為有效量化此一分析結果，本論文建立實驗利用建立的虛擬衛星所提供的額外觀測量分別對商用接收器及軟體接收器作定位干擾影響之分析。

The object of this thesis is to analyze GPS navigation performance in the presence of spoofing. GPS systems have been widely used in navigation and commercial products to provide location information. However, for some critical mission such as aircraft landing the required navigation performance in terms of accuracy, integrity, and availability is very strict. In particular, the navigation performance may be vulnerable to spoofing. In the thesis, a RAIM (receiver autonomous integrity monitoring) approach is adopted to analyze GPS performance in the presence of spoofing. To validate the analysis results, a pseudolite is modified to transmit spoofing signals. It is found that commercial GPS receivers are susceptible to spoofing.

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