Radio-holographic reflector measurement of the 30-m millimeter radio telescope at 22 GHz with a cosmic signal source

Details Radio-holographic reflector measurement of the 30-m millimeter radio telescope at 22 GHz with a cosmic signal source Radio-holographic reflector measurement of the 30-m millimeter radio telescope at 22 GHz with a cosmic signal source

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...203..399m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 203, no. 2, Sept. 1988, p. 399-406.

Astronomy and Astrophysics

Astrophysics

14

Holography, Interstellar Masers, Radio Telescopes, Reflectors, Emission Spectra, Error Analysis, Fourier Transformation, Polarization (Waves), Water Masers

Scientific paper

The reflector profile of the IRAM 30-m telescope has been measured by the method of radio holography with a measuring accuracy (repeatability) of 25 microns rms. The strong water-vapor maser source in Orion at frequency 22.235 GHz was used as signal source. Phase reference was provided by a 1.75-m antenna mounted parallel to the beam axis of the telescope. A 16-channel spectrometer was used to separate the maser signal from the background, simultaneously decreasing the influence of tropospheric disturbances (which determined the reproducibility of the measurements). Astigmatism in the feeds was removed by combining measurements at two orthogonal polarizations. A complete dual-polarization map of 32 x 32 points took about 20 h telescope time. The results are presented in the form of maps of reflector deviation .A comparison with antenna efficiency measurements is made. The effective surface accuracy is about 65 microns rms, with an uncertainty of 10 microns.

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