現今，GPS已經成為一重要且成熟的導航系統，GPS系統除了設計提供地面上的導航應用外，在高動態環境例如地球低軌道上也有廣泛的應用。本論文旨在自行開發一太空級GPS接收器作為低軌道微衛星之酬載，並針對其性能測試詳細討論。太空級GPS接收器設計有別於一般商用型GPS接收器，這是因為低軌道環境的訊號受高動態影響而存在極大的都卜勒頻移，一般商用型GPS接收器並不支援如此高速運動所造成的都卜勒頻移。在低成本的考慮下，自行開發太空級GPS接收器是最好的選擇。本論文中，首先研究位於高度550公里、傾角22.3度之低軌道的GPS訊號特性，且分析低軌道上的GPS衛星可視性與都卜勒頻移；其次利用GPS訊號模擬器GSS7700測試所設計的太空級GPS接收器原型，並就高動態環境下所遭遇的問題與限制，提出適當的改善方案。最後以圖闡明太空級GPS接收器的性能分析。

Nowadays, GPS has become one of the most crucial navigation systems. GPS system was designed for near Earth navigation, nevertheless it’s also widely used in high dynamic environments such as Low Earth Orbit (LEO). This thesis details the performance test of a self-developed space-borne GPS receiver(GPSR) as a payload for a micro satellite. A space-borne GPSR differs from a commercial GPSR due to the high Doppler shifts and Doppler shift rates experienced in the high dynamic environment of LEO. A self-developed space-borne GPS navigation system is preferable from the consideration of cost-effectiveness. At first, the signal characteristics such as visibility and Doppler shift with respect to the GPS satellites are investigated for a satellite orbiting at altitude 550 km and 22.3 deg of inclination. Next, a prototype of space-borne GPSR which is also designed and tested by receiving the simulated GPS signal from simulator, GSS7700. Some consequences of the high dynamic environment are observed and appropriate countermeasures are presented. The design and development of the space-borne GPSR as well as its performance under a simulated high dynamic environment are discussed.

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