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10GHz Sky Survey Project, Waseda FFT Interferometer

Published online by Cambridge University Press:  12 April 2016

J. Nakajima ,
E. Otobe ,
K. Asuma  and
T. Daishido
J. Nakajima
Affiliation:
Astrophysics, Department of Pure and Applied physics, Waseda University, Okubo Shinjuku-ku Tokyo 169, Japan
E. Otobe
Affiliation:
Astrophysics, Department of Pure and Applied physics, Waseda University, Okubo Shinjuku-ku Tokyo 169, Japan
K. Asuma
Affiliation:
Astrophysics, Department of Pure and Applied physics, Waseda University, Okubo Shinjuku-ku Tokyo 169, Japan
T. Daishido
Affiliation:
Astrophysics, Department of Science, School of Education, Waseda University, Nishi-Waseda Shinjuku-ku Tokyo 169, Japan

Extract

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Large-field radio interferometer at 10.65GHz have been developed to search for transient radio objects such as radio supernovae and radio bursts in stellar systems (Daishido et al. 1984). This is a spatial fast-fourier transform (FFT) type radio interferometer, being an equally-spaced, maximum redundant, two-dimensional (2D) array in an 8 × 8 configuration. Sixty-four identically-designed frontend elements are comprised of 2.4 m diameter cassegrain antennas and 200K HEMT receivers. These are steerable in elevetion and are fixed in azimuth. Although it is only partially operating, the completed system having 64 beams in the northern hemisphere is expected to provide maps having 0.1° angular resolution and a sensitivity of 50 mJy. The beams are formed by a newly-developed “Digital Lens” (complex amplitude equalizer + 2D FFT pipelined processor), with the array’s overall size being 20 × 20m.

Type
2. Technical Innovations
Information
International Astronomical Union Colloquium , Volume 140: Astronomy with Millimeter and Submillimeter Wave Interferometry , 1994 , pp. 119 - 120
Copyright
Copyright © Astronomical Society of the Pacific 1994

References

Daishido, T., Ohkawa, T., Yokoyama, T., Asuma, K., Kikuchi, H., Nagane, K., Hirabayashi, H., and Komatsu, S. 1984, in Indirect Imaging, ed. by Roberts, J. A., (Cambridge University Press, Cambridge), p. 81. Google Scholar
Nakajima, J., Otobe, E., Nishibori, K., Watanabe, N., Asuma, K., and Daishido, T. 1992, Publ. Astron. Soc. Japan, Vol. 44 No. 3, L35–38.Google Scholar
Nakajima, J. et al. 1993, Publ. Astron. Soc. Japan, Vol. 45, in press.Google Scholar