Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasj...57..815t&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.57, No.5, pp. 815-820
Astronomy and Astrophysics
Astronomy
12
Instrumentation: Interferometers, Radio Continuum: General, Techniques: Interferometric
Scientific paper
The Nasu Radio Interferometer, consisting of eight equally spaced, 20-m diameter fixed spherical antennas, was developed for the purpose of surveying unknown variable radio sources at 1.4GHz. An asymmetrical Gregorian sub-reflector was designed and installed on each antenna for the purpose of correcting aberrations caused by the spherical reflector. The total collecting area is 2512m2 and the field-of-view of each antenna is 0.°6 × 0.°6. In survey observations a spatial-fast Fourier-transform (FFT)-type multi-beam system will be used. We report on the design of spherical reflectors and a digital back-end system, the basic principle of spatial-FFT image forming, and a result of interferometric observations with an FPGA-based digital correlator.
Akamine Yukinori
Asuma Kuniyuki
Daishido Tsuneaki
Fujii Fumiyuki
Ichikawa Hajime
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