Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.1981h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Feb. 10, 1992, p. 1981-1990. Research supported by Kerr-McGee Foundat
Physics
7
Geodetic Accuracy, Radio Telescopes, Signal To Noise Ratios, Very Long Base Interferometry, Error Analysis, Root-Mean-Square Errors
Scientific paper
An analysis of interferometric phase delays from 15 years of Mark I and Mark III very long baseline interferometry (VLBI) experiments carried out with two radio telescopes in Westford, Massachusetts, about 1.24 km apart, yields weighted root-mean-square (WRMS) scatters about the mean locally horizontal coordinates of 1.0 and 2.0 mm in the north and east directions, respectively. It is concluded that VLBI antennas of at least of the structural quality of the pair in Westford satisfy a necessary but not sufficient condition for being able to maintain a global reference system with submillimeter per year accuracy for intervals in excess of a decade. These data are also used to determine an error model for the VLBI group delay measurements, and, for this particular pair of telescopes, they indicate that the WRMS difference between group and phase delays is composed of a constant part (5.4 mm, for the most recent data) and a SNR term which is about 10 percent larger than that computed theoretically.
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