Upgrade of a large millimeter-wavelength radio telescope for improved performance at 115 GHz.

Details Upgrade of a large millimeter-wavelength radio telescope for improved performance at 115 GHz. Upgrade of a large millimeter-wavelength radio telescope for improved performance at 115 GHz.

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ieeep..82..734b&link_type=abstract

Proc. IEEE, Vol. 82, No. 5, p. 734 - 741

Physics

Optics

2

Radio Telescopes: Antennas, Radio Telescopes: Accuracies

Scientific paper

A 20.1-m-diameter radome enclosed radio telescope, built by Electronic Space Systems Corporation (ESSCO) at the Onsala Space Observatory near Gothenberg, Sweden, in 1975, was upgraded by ESSCO in 1992 for improved operation at 115 GHz, increasing the system aperture efficiency from 20% to 40% at this higher frequency. Electrical gain measurements confirm geometric optics predictions of efficiency and improved antenna patterns. Graphical data are presented that compare computer predictions of reflector backstructure gravity deformations to optical measurements, which proved crucial in achieving the stringent alignment accuracies. Measured antenna efficiency data before and after the upgrade are included.

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