Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ieeen...4....8e&link_type=abstract
IEEE Network (ISSN 0890-8044), vol. 4, Sept. 1990, p. 8-12.
Physics
Command And Control, Deep Space Network, Galileo Probe, Spacecraft Communication, Telemetry, Clocks, Galileo Project, Synchronism, Time Division Multiplexing
Scientific paper
An overview is given of the Galileo command and telemetry subsystems, which exemplify the rigid time-synchronized systems required by TDM (time division multiplexing). The spacecraft clock is examined, along with some of the rationale for the development of the clock structure and timing to give a sense of the design imperatives for rigidly synchronized systems. Additional subjects include the structure of the science and engineering frames, emphasizing the subcommutated structure of the engineering frame and its relationship to the spacecraft clock; ground processing for and basic uses of the telemetry; the various message types used to transmit commands to the spacecraft; and the generation processes for the command message types.
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