• 作者： 翁瑞麟
• 作者服務機構： 行政院國家太空計劃室籌備處
• 中文摘要： 一個以太空中24顆運轉衛星為主所建構的全球定位系統，能夠精確地提供全球任何角落的使用者，量測其在三度空閒上的位置和速度，而且也能提供時閒的正時。此系統的巡航理論是基於接收由4顆衛星所傳輸的電磁波。這個全球定位系統在性能特性上，能提供多領域的功能，比如飛行巡航、使用者定位、資源比對圖表、酬載展開和回收、飛行體角度定位、和任務規劃。 全球定位系統在全球的發展和應用上已超過了二十年，我們深信它的商業價值將持續的成長。這篇論文將提供對全球定位系統有興趣的讀者一份概括性的知識。 基本上，對於全球定位系統的系統操作原理、巡航訊號及資料傳輸、系統準確度、和其它系統上的特性等將在此闡述。
• 英文摘要： The NAVSTAR/GPS (Navigation Satellite Timing and Ranging/Global Positioning System), a space-based navigation system, will accurately provide three-dimensional position and velocity, as well as timinginformation to users anywhere in the world. The navigation algorithm is based on the measurement oftransit time of RF signals transmitted from four satellites in a total constellation of 24. The superiorGPS performance can provide significant benefits in the areas of flight navigation, user positioning, resourcemapping, payload deployment and retrieval, space vehicle orientation determination, and mission planning. The development and implementation of GPS have been pursued by many countries for more thantwenty years．We are persuaded that its application potential is increasing. This paper gives a generaloverview for readers who are interested in GPS． A basic review of the GPS system of operation principle, navigation signals and messages，systemaccuracy and error sources, and other characteristics of the system is presented.
• 中文關鍵字： NAVSTAR; GPS; navigation
• 英文關鍵字： --