Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980spie..231...26f&link_type=abstract
In: 1980 International Optical Computing Conference, Washington, DC, April 8-11, 1980, Proceedings. Book 1. (A81-37755 17-35) Be
Astronomy and Astrophysics
Astronomy
Data Reduction, Radio Telescopes, Signal Measurement, Signal Processing, Synthetic Arrays, Transformations (Mathematics), Antenna Design, Computer Techniques, Convolution Integrals, Earth Rotation, Radio Astronomy
Scientific paper
In synthesis radiotelescopes measurements are made of the autocorrelation function of the electric field associated with a distant source of radio emission. Two-dimensional data sets arise from the use of one-dimensional arrays lying on an East-West line on the Earth's surface. As the earth rotates the relative positions of the elements of the one-dimensional array sweep through a circle, thus synthesizing a two-dimensional array. When synthesis is performed with elements which do not lie in an East-West direction, the measurements vectors generate cones as the earth rotates and the resultant measurement set is three-dimensional. An investigation is conducted concerning some of the possible approaches to the problem of reducing three-dimensional data. The transform for three-dimensional data is considered and analysis strategies are discussed, taking into account the 3-D transform approach, the convolution and 2-D transform approach, and the back projection method.
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