Level of Negative Sidelobes in an Array Beam

Details Level of Negative Sidelobes in an Array Beam Level of Negative Sidelobes in an Array Beam

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasp..111..510k&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 758, pp. 510-511.

Astronomy and Astrophysics

Astronomy

1

Instrumentation: Interferometers

Scientific paper

It is shown that the level of negative sidelobes of an array's beam in the snapshot observation does not depend on the array configuration and is determined completely by the number of the elements at the array. This level is not less than -1/N-1 for any array's beam, where N is the number of elements at the array. For the central symmetry arrays, all negative sidelobes are tangent to the horizontal line at the level -1/N-1. For large N, positive sidelobes are bigger than negative ones (in absolute values). For example, for VLA (N=27) and VLBA (N=10), the value of negative sidelobes should be 0.038 and 0.11, respectively, for any configuration.

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