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Extending the Observable Zenith Angle of FAST Using an Offset Feed

Published online by Cambridge University Press:  12 April 2016

Li Guoding ,
R. Nan  and
B. Peng
Li Guoding
Affiliation:
State Key Laboratory on Microwave and Digital Communication, The Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
R. Nan
Affiliation:
Beijing Astronomical Observatory, National Astronomical Observatories, CAS, Beijing 100012, China
B. Peng
Affiliation:
Beijing Astronomical Observatory, National Astronomical Observatories, CAS, Beijing 100012, China

Abstract

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The five hundred meter aperture spherical radio telescope is will use an active spherical reflector. When the zenith scan angle is changed, the illuminated part of the reflecting surface is made to fit a paraboloid of revolution in real time by active control. The maximum zenith scan angle | ψmax | of FAST is 30° under conditions of the geometry selected in order that the feed does not illuminate the ground. The result of this paper shows that the maximum zenith scan angle | ψmax | can be extended to 69° by offsetting the feed.

Keywords

radio telescopemaximum zenith scan angleoffset-fed
Type
Chapter Five Future Large Telescope Projects: SKA and FAST
Information
International Astronomical Union Colloquium , Volume 182: Sources and Scintillations: Refraction and Scattering in Radio Astronomy , 2001 , pp. 255 - 259
Copyright
Copyright © Kluwer 2001

References

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