Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ptti.nasa..659c&link_type=abstract
In NASA. Goddard Space Flight Center Proc. of 10th Ann. Precise Time and Time Interval (PTTI) Appl. and Planning Meeting p 65
Astronomy and Astrophysics
Astronomy
1
Deep Space, Radio Navigation, Space Navigation, Clocks, Deep Space Network, Differential Equations, Doppler Effect, Frequency Standards, Masers, Navigation Aids, Quasars, Radio Astronomy, Satellite Tracking, Synchronism, Time Measurement, Very Long Base Interferometry, White Noise, Wideband Communication
Scientific paper
Radio metric deep space navigation relies nearly exclusively upon coherent, two way, Doppler and ranging for all precise applications. These data types and the navigational accuracies they can produce are reviewed. The deployment of hydrogen maser frequency standards and the development of Very Long Baseline Interferometry (VLBI) systems within the Deep Space Network are used in the development of non-coherent, one way data forms that promise much greater inherent navigational accuracy. The underlying structure between each data class and clock performance is charted. VLBI observations of the natural radio sources are the planned instrument for the synchronization task. This method and a navigational scheme using differential measurements between the spacecraft and nearby quasars are described.
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