Journal of the Korean Institute of Telematics and Electronics S (전자공학회논문지S)
- Volume 34S Issue 7
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- Pages.39-47
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- 1997
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- 1226-5837(pISSN)
Link anlaysis of TTC system for LEO satellite
저궤도 위성 관제 시스템의 링크 특성 분석
Abstract
The mission of the TTC system is to acquire and process the telemetry data from the satellite and to provide mission planning and satellite control for the target stellite system. In this paper, the transmission scheme for the Tracking, Telemetry and Command(TTC) system of satelliteis described and determined according to the recommendation of CCSDS, and the channel characteristics are analyzed according to modulation method. Expecially, we introduced the concepts of carrier vs. telemetry data power ratio which causes the channel performance to degrade, and analyzed the effects of transmission performance according to the power ratio of carrier vs. telemetry data and the modulation index. The channel of the LEO TTC sytem is different with usual satellite communication system. So, we have generalized the link budget of TTC sytem for using the link budget of ground station well-known and proposed the determination method of modultion indices for improveing channel performance.
Keywords