Computer Science – Performance
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jhatd..11...97d&link_type=abstract
Johns Hopkins APL Technical Digest (ISSN 0270-5214), vol. 11, Jan.-June 1990, p. 97-101.
Computer Science
Performance
Satellite Navigation Systems, Satellite Networks, Transit Satellites, Doppler Effect, Orbital Lifetime, Radio Navigation, Service Life, Spacecraft Performance
Scientific paper
The original concept for the Navy Navigation Satellite System (NNSS), or Transit system, and its current configuration are outlined and the reliability of the Oscar satellites and the constellation operation, maintenance, and monitoring are described. An overview of the operational status for each satellite is presented and the second-generation Nova satellite disturbance compensation system for adjusting the along-track position in their orbits is analyzed in detail. The ground system and data collection, interpretation, and transmission process are outlined; special mention is made of the drag-compensation algorithm for drag-sensitive satellites which allows for a manual establishment of a revised along-track force bias, thus permitting satellites to remain in service.
Danchik Robert J.
Pryor Lee L.
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