Reduction of the baseline ripple on spectra recorded with the Parkes radio telescope

Details Reduction of the baseline ripple on spectra recorded with the Parkes radio telescope Reduction of the baseline ripple on spectra recorded with the Parkes radio telescope

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pasau...3..111p&link_type=abstract

(Astronomical Society of Australia, Annual General Meeting, 11th, Clayton, Victoria, Australia, May 30-June 1, 1977.) Astronomic

Astronomy and Astrophysics

Astronomy

4

Astronomical Spectroscopy, Noise Reduction, Radio Telescopes, Recording Instruments, Ripples, Antenna Feeds, Focal Plane Devices, Horn Antennas, Radio Astronomy, Radio Spectra, Radio Spectroscopy

Scientific paper

Two sources of baseline ripple on the 64 m Parkes radio telescope at 5 GHz are described in terms of methods for their reduction. The first, off-source, arises even when the telescope is pointing at a cold sky, and can be fairly easily attenuated by subtracting an off-source reference from the signal spectrum. Attention is given to the second source, on-source ripple, which depends on the characteristics of the radio spectrum observed. Methods for correcting on-source ripple are outlined, including a vertex scattering cone, which provides almost total elimination of second and higher order harmonic ripple; a focal plane absorber, which reduces the third harmonic by 50%; shaped vertex planes, reducing fundamental ripple to 0.25% of the continuum temperature; and the two-hybrid-mode feed horn, which increases theoretical energy by about 83%, thereby reducing by 40% the energy left over for scattering.

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