Implementation and Test of a Space-borne GPS Receiver Payload of Micro Satellite

• Main Authors: Cho-ChiaChang, 張倬嘉
• Other Authors: Jyh-Ching Juang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/18362056929243467810

碩士 === 國立成功大學 === 電機工程學系碩博士班 === 98 === 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.