Computer Science – Performance
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jhatd..14....2h&link_type=abstract
APL Technical Digest, vol. 14, Oct.-Dec. 1975, p. 2-7. NASA-sponsored research.
Computer Science
Performance
Digital Command Systems, Fail-Safe Systems, Radio Telemetry, Sas-3, Satellite Attitude Control, Time Lag, Airborne/Spaceborne Computers, Command And Control, Data Systems, Data Transmission, Real Time Operation, Redundant Components, Satellite Design
Scientific paper
To meet the requirements arising from the increased complexity of the power, attitude control and telemetry systems, a full redundant high-performance control section with delayed command capability was designed for the Small Astronomy Satellite-3 (SAS-3). The relay command system of SAS-3 is characterized by 56 bystate relay commands, with capability for handling up to 64 commands in future versions. The 'short' data command service of SAS-1 and SAS-2 consisting of shifting 24-bit words to two users was expanded to five users and augmented with a 'long load' data command service (up to 4080 bits) used to program the telemetry system and the delayed command subsystem. The inclusion of a delayed command service ensures a program of up to 30 relay or short data commands to be loaded for execution at designated times. The design and system operation of the SAS-3 command section are analyzed, with special attention given to the delayed command subsystem.
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