Multiple Drift Scans: A Method for Radio Continuum Observations in a Radome

Details Multiple Drift Scans: A Method for Radio Continuum Observations in a Radome Multiple Drift Scans: A Method for Radio Continuum Observations in a Radome

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasp..109.1167b&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.109, p.1167-1169

Astronomy and Astrophysics

Astronomy

1

Radio Continuum: General

Scientific paper

This paper outlines a new applicaton of the technique of drift scanning, for single-dish radio continuum measurements within a radome. A radome scatters varying amounts of ground radiation into the receiver feed for different antenna positions, causing difficult-to-cancel total power fluctuations as astronomical sources are tracked. Parking the telescope and allowing a source to drift through the beam largely eliminates this problem, and integration time can be built up by doing multiple drift scans on a given source. This technique has resulted in near-theoretical noise performance for the Haystack telescope, albeit with the rather low on-source duty cycle inherent in this technique. But even with the low duty cycle, multiple drift scanning has proven superior to the standard radome-retrace beamswitching techniques used previously. (SECTION: Astronomical Instrumentation)

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