Assessment of the accuracy of daily UT1 determinations by very long baseline interferometry

Details Assessment of the accuracy of daily UT1 determinations by very long baseline interferometry Assessment of the accuracy of daily UT1 determinations by very long baseline interferometry

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.8193r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. B5, p. 8193-8200

Other

9

Accuracy, Earth Orientation, Error Analysis, Nutation, Universal Time, Very Long Base Interferometry, Atmospheric Moisture, Interferometers, Interpolation, Iris Satellites, Polar Wandering (Geology)

Scientific paper

By comparing UT1 determinations from the International Radio Interferometric Surveying intensive program of quasi-daily, single-baseline, 1-hour very long baseline interferometry (VLBI) measurement sessions with coincident, multibaseline 24-hour VLBI determinations, we estimate the overall accuracy of the intensive UT1 results, averaged over 5.4 years of data, to be approximately 52 microseconds, depending somewhat on the amount of error attributed to the multibaseline results. The largest error contributions are due to interpolated values for polar motion X and Y coordinates (less than 38 microseconds), short-term variability in atmospheric propagation (approximately 48 microseconds during summers but much less at other times), and extended brightness structures in the radio sources (approximately 22 microseconds). Because the atmospheric effect is most pronounced during summers, the UT1 accuracy of the intensives is approximately 47 microseconds most of the year but degrades to approximately 67 microseconds during the third quarter of each year.

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