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STUDY OF FACTORS AFFECTING SYSTEM RELIABILITY
ARINC RESEARCH CORP WASHINGTON D C
AD- N3 AD-272 190Div. 12 U TISTASEBARINC Research Corp., Washington, D. C. EVALUATION OF TRANSIT SATELLITE RELIABILITY, by J. A McGill, H. Dagen, and C. L. Noelcke. 26 July 61, 80p. incl. illus. tables, refs. Rept. no. 3 Pub. no. 173-2-252 Contract SD-77, continuation of Contract SD-50-3 In cooperation with Applied Physics Lab., Johns Hopkins University Unclassified report DESCRIPTORS Satellite vehicles, Navigation, Doppler navigation, Doppler systems, Radio signals, Command systems, Radio transmission, Telemetering data, Telemetering transmitters, Reliability, Life expectancy, Mathematical analysis, Statistical analysis, Mathematical prediction. Identifiers Transit, Ephemeris. Reliability evaluations are presented for the TRANSIT NAV-3B system, its major subsystems, and of the NAV-4A system. As the NAV-4A design information available to ARINC is limited, the prediction for this system configuration is tentative and must be regarded as a ball-park estimate. Reliability functions were derived and computed for three task configurations of the NAV-3B system, corresponding to 3 functional situations 1 doppler signal task, 2 operational task doppler signalling plus transmission of ephemeris information, and 3 telemetering task transmission of engineering-evaluation data. For the operational task, reliability functions were computed for 3 levels of system performance, corresponding to the probability of obtaining at least 1, at least 8, or the entire 16 words from the Memory Subsystem. Three NAV-4A task configurations were also considered 1 the X- and Y-megacycle doppler signalling task, 2 the 54- and 324-mc doppler signalling task, and 3 the operational task. Author