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

    Research output: Contribution to journalArticlepeer-review

    16 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

    Fingerprint Dive into the research topics of 'Asymmetric sub-reflectors for spherical antennas and interferometric observations with an FPGA-based correlator'. Together they form a unique fingerprint.

    Cite this