A way to improve the field of view of the large aperture radio telescope

Details A way to improve the field of view of the large aperture radio telescope A way to improve the field of view of the large aperture radio telescope

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005acasn..46..108g&link_type=abstract

Acta Astronomica Sinica, vol. 46, no. 1, p. 108-116

Astronomy and Astrophysics

Astronomy

Techniques: Large Radio Telescope, Techniques: Extend Field Of View, Instrumentation: Vivaldi Element And Array

Scientific paper

There is a limitation in the field of view (FOV) of large aperture radio telescopes, which is usually unavoidable. In order to enlarge the FOV, we may place several discrete feeds at the focal plane of the telescope. When all of the feeds work at the same time, we will achieve a FOV extended to several times, which equivalently times the functions of a telescope. The disadvantage of this solution is the sparseness of the sampling at the FOV, which is not desirable for continually imaging process. Moreover, the number of the feeds mounted on focus is restricted by the F/D ratio of the telescope. We investigate in this paper an innovated technology to realize the simultaneous and continuous large FOV for the FAST (Five-Hundred-meter Aperture Spherical radio Telescope). The new feed is proposed to be made of a focus array whose elements are microstrip antenna, so called Vivaldi antenna. Electro-magnetic property of the Vivaldi element and the Vivaldi array are introduced, which is essential to the formation of the focus array. Focal field distribution (FFD) of the FAST of different illuminated portions is simulated using the software package GRASP8. The results give critical information for the layout deign of the focus array, especially, the weighting system of Vivaldi array. Cursory configurations of the array structure are suggested, and illumination patterns are estimated. Finally, some remarks on the feasibility of applying the Vivaldi array to FAST are made.

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