Mathematics – Logic
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979rasc...14..605c&link_type=abstract
(International Union of Radio Science, Open Symposium on Time and Frequency, 1st, Helsinki, Finland, Aug. 1-4, 1978.) Radio Scie
Mathematics
Logic
Bit Synchronization, Data Transmission, Frequency Stability, Satellite Tracking, Time Measurement, Clocks, Nasa Programs, Radio Relay Systems, Satellite Transmission, Tdr Satellites, Technological Forecasting, Telstar Satellites, Time Signals
Scientific paper
A brief review of the research accomplishments by NASA in meeting the needs of the space program for precise time in satellite tracking is presented. As a major user of precise time signals for clock synchronization of NASA's worldwide satellite tracking networks, the agency provided much of the necessary impetus for the development of stable frequency sources and time synchronization technology. The precision in time required for both satellite tracking and space science experiments has increased at a rate of about 1 order of magnitude per decade from 1 ms in the 1950's to 100 microsec during the Apollo era in the 1960's to 10 microsec in the 1970's. In the 1980's, when the Tracking and Data Relay Satellite System (TDRSS) comes into operation, satellite timing requirements will be extended to 1 microsec and below. These requirements are needed for spacecraft autonomy and data packeting which are now in active planning stages.
Chi A. R.
Cooper Richard S.
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