Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7413d&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #74.13; Bulletin of the American Astronomical Society, Vol. 24, p.1241
Other
Scientific paper
Arrays of radio telescopes are now routinely used not only to map extended radio sources, and make high accuracy astrometric measurement of point sources, but to provide increased signal-to-noise when observing faint sources. In this latter case, calculation of the achievable signal-to-noise becomes complicated if there are radio sources in the field of view other than the target source. These additional sources not only increase the effective system temperature, but may contribute significant "correlated noise" as well. This problem has been of particular interest in the context of tracking spacecraft in the vicinity of radio-loud planets (e.g. Galileo and Jupiter), but it has broader astronomical relevance as well. This paper presents a general formulation of the problem, for the case of a point-like target source (either broad- or narrow-band) in the presence an additional radio source of arbitrary brightness distribution. It is found that the effects of correlated noise are highly geometry dependent and may cause significant fluctuations in signal-to-noise in the course of observations covering many hours. A number of specific situations are discussed. This work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
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