Analytical techniques for improved time transfer using common view of direct broadcasting satellites

Computer Science – Numerical Analysis

Scientific paper

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Correction, Direct Broadcast Satellites, Distance, Numerical Analysis, Position (Location), Time Measurement, Delay, Digital Filters, Drift Rate, Errors, Periodic Variations

Scientific paper

Time transfer using television signals from direct broadcasting satellites is an accurate and inexpensive method of comparing atomic clocks at distant locations. The major source of error arises from the residual motion of the geostationary satellite. Previous work showed that it is possible to determine the components of the satellite motion by observing two widely spaced geostationary satellites simultaneously from three locations. A method where the common view measurements are corrected for the variation of the positions of the satellites is developed. In contrast to previous work, there is no requirement to calculate explicitly the coordinate of the satellites. Time transfers with uncertainties of a few parts in 10 exp 14 were obtained. The longitudinal drift and periodic variations of the satellite positions were determined.

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