TY - JOUR
T1 - Asymmetric sub-reflectors for spherical antennas and interferometric observations with an FPGA-based correlator
AU - Takeuchi, Hiroshi
AU - Kuniyoshi, Masaya
AU - Daishido, Tsuneaki
AU - Asuma, Kuniyuki
AU - Matsumura, Nobuo
AU - Takefuji, Kazuhiro
AU - Niinuma, Kotaro
AU - Ichikawa, Hajime
AU - Okubo, Riki
AU - Sawano, Akihiro
AU - Yoshimura, Naoya
AU - Fujii, Fumiyuki
AU - Mizuno, Keiju
AU - Akamine, Yukinori
PY - 2005
Y1 - 2005
N2 - 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 2512 m2 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.
AB - 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 2512 m2 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.
KW - Instrumentation: interferometers
KW - Radio continuum: general
KW - Techniques: interferometric
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M3 - Article
AN - SCOPUS:27744566743
SN - 0004-6264
VL - 57
SP - 815
EP - 820
JO - Publications of the Astronomical Society of Japan
JF - Publications of the Astronomical Society of Japan
IS - 5
ER -