Computer Science – Performance
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jhatd...5..225j&link_type=abstract
Johns Hopkins APL Technical Digest (ISSN 0270-5214), vol. 5, July-Sept. 1984, p. 225-237.
Computer Science
Performance
Airborne/Spaceborne Computers, Computer Systems Performance, Minicomputers, Navigation Satellites, Software Tools, Nova Computers, Satellite Configurations, Spacecraft Motion, System Failures
Scientific paper
The Transit Improvement Program TIP satellites were designed to upgrade the navigation satellite system. One of the improvements made in connection with these satellites is related to the employment of a general-purpose minicomputer. A description is provided of the uses of the TIP/Nova flight computer to overcome some early failures in the spacecraft development which, although later corrected, could have jeopardized the entire program. The flight computer and its software is discussed, taking into account the delayed command program, and the telemetry storage program. The effect of the failures is considered along with the post-launch operations. Attention is given to power management, spin-up operations, the firing of the orbit adjust rocket, the tumble-thrust program, a digital phase-locked loop for de-tumble, and the generation of a tumble motion.
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