Very-long-baseline radio interferometry - The Mark III system for geodesy, astrometry, and aperture synthesis

Details Very-long-baseline radio interferometry - The Mark III system for geodesy, astrometry, and aperture synthesis Very-long-baseline radio interferometry - The Mark III system for geodesy, astrometry, and aperture synthesis

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sci...219...51r&link_type=abstract

Science, vol. 219, Jan. 7, 1983, p. 51-54. U.S. Geological Survey

Mathematics

Logic

192

Astrometry, Geodesy, Radio Interferometers, Synthetic Apertures, Very Long Base Interferometry, Central Processing Units, Extragalactic Radio Sources, Signal Processing

Scientific paper

The Mark III very-long-baseline interferometry (VLBI) system allows recording and later processing of up to 112 megabits per second from each radio telescope of an interferometer array. For astrometric and geodetic measurements, signals from two radio-frequency bands (2.2 to 2.3 and 8.2 to 8.6 gigahertz) are sampled and recorded simultaneously at all antenna sites. From these dual-band recordings the relative group delays of signals arriving at each pair of sites can be corrected for the contributions due to the ionosphere. For many radio sources for which the signals are sufficiently intense, these group delays can be determined with uncertainties under 50 picoseconds. Sample results are given for the lengths of baselines between three antennas in the United States and three in Europe as well as for the arc lengths between the positions of six extragalactic radio sources.

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