Computer Science – Performance
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991crlj...38..417t&link_type=abstract
Communications Research Laboratory, Journal (ISSN 0914-9260), vol. 38, no. 3, p. 417-433.
Computer Science
Performance
2
Amplification, Cassegrain Antennas, Radio Antennas, Radio Receivers, Reflector Antennas, Very Long Base Interferometry, Antenna Feeds, Antenna Radiation Patterns, Parametric Amplifiers, Pointing Control Systems, Superhigh Frequencies
Scientific paper
The Communications Research Laboratory has four antennas dedicated to VLBI observations, the diameters are 3 m, 10 m, 26 m, and 34 m. The two largest antennas, 26 m and 34 m, are used mainly for international VLBI experiments: geodesy, earth rotation study, and radio astronomy. The 3-m antenna and the 10-m antenna are used for domestic geodesy VLBI experiments. The 26-m antenna of the Kashima Space Research Center has S/X band receivers and has been used for international VLBI experiments since 1984. The 3-m antenna, which is the world smallest VLBI station, was developed for mobile experiments. The 10-m antenna at Marcus Island and the 34-m antenna at Kashima were completed in 1988. They are key stations in the Western Pacific VLBI network for monitoring tectonic plate motion around Japan. The surface accuracy of the 34-m antenna is 0.17 mm (rms). This enables it to be used at millimeter wavelengths. Ten low-noise radio astronomy frequency-band receivers from 300 MHz to 43 GHz are installed on the antenna. This paper describes the performance of CRL's VLBI antennas and gives details of the new 34-m antenna system including a new antenna pointing calibration method for medium-sized antennas.
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