CCSDS 401.0-B-21.pdf - mtc-m18:80 - Inpe

CCSDS RECOMMENDATIONS FOR RADIO FREQUENCY AND MODULATION SYSTEMSEarth Stations and Spacecraft2.1.3ATRANSMITTER FREQUENCY SWEEP RANGE ON EARTH-TO-SPACELINKS, CATEGORY AThe CCSDS,considering(a)that the Doppler frequency shift on the Earth-to-space link, resulting from relative motionbetween Earth stations and Category A spacecraft, can achieve values up to:± 80 kHz at 2 GHz± 300 kHz at 7 GHz;(b)that the rest frequency uncertainties in spacecraft receivers are in the order of:± 50 kHz at 2 GHz± 200 kHz at 7 GHz;(c)(d)(e)that the lock-in frequency range of spacecraft receivers is much smaller than the frequencydeviations given in (a) and (b);that the Doppler frequency shift can usually be predicted to an accuracy of better than ± 1 kHz;that most of the spacecraft receivers have a tracking range up to:± 150 kHz at 2 GHz± 500 kHz at 7 GHz;(f)that the acquisition time should be kept to a minimum;recommendsthat the Earth station’s transmitter should have a minimum sweep range capability of at least:± 1 kHzand a maximum sweep range capability of:± 150 kHz at 2 GHz± 500 kHz at 7 GHz.CCSDS 401 (2.1.3A) B-1 Page 2.1.3A-1 January 1987