Asymmetric sub-reflectors for spherical antennas and interferometric observations with an FPGA-based correlator

Hiroshi Takeuchi*, Masaya Kuniyoshi, Tsuneaki Daishido, Kuniyuki Asuma, Nobuo Matsumura, Kazuhiro Takefuji, Kotaro Niinuma, Hajime Ichikawa, Riki Okubo, Akihiro Sawano, Naoya Yoshimura, Fumiyuki Fujii, Keiju Mizuno, Yukinori Akamine

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)815-820
    Number of pages6
    JournalPublications of the Astronomical Society of Japan
    Volume57
    Issue number5
    Publication statusPublished - 2005

    Keywords

    • Instrumentation: interferometers
    • Radio continuum: general
    • Techniques: interferometric

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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