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

CCSDS RECOMMENDATIONS FOR RADIO FREQUENCY AND MODULATION SYSTEMSEarth Stations and Spacecraft2.2.2 SUBCARRIERS IN TELECOMMAND SYSTEMSThe CCSDS,considering(a)(b)(c)(d)that most space agencies presently utilize either 8 kHz or 16 kHz subcarriers for telecommandtransmissions where data rates are less than or equal to 4 kb/s;that modulation schemes employing subcarriers reduce the interference to the RF carrier loopresulting from data sidebands;that PSK modulation is the most efficient type of digital modulation because of its bit errorperformance;that it is important to limit the occupied bandwidth;recommendsthat CCSDS agencies use a sine wave subcarrier for telecommand, with a frequency of either8 kHz or 16 kHz, which has been PSK modulated.CCSDS 401 (2.2.2) B-1 Page 2.2.2-1 January 1987