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1988 Fiscal Year Final Research Report Summary

Development of surface measuring system for large-diameter antennas using satellite signals.

Research Project

Project/Area Number 60840001
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionUniversity of Tokyo

Principal Investigator

ISHIGURO Masato  Tokyo Astronomical Observatory, University of Tokyo, 東京天文台, 助教授 (40023684)

Co-Investigator(Kenkyū-buntansha) 別段 信一  三菱電機, 通信機製作所衛星通信部, 参事 (10298317)
MORITA Koh-Ichiro  Tokyo Astronomical Observatory, University of Tokyo, 東京天文台, 助手 (20167688)
BETSUDAN Shin-Ichi  Mitsubishi Electric Corporation
Project Period (FY) 1985 – 1986
KeywordsRadio holography / Millimeter-wave antenna / 電波望遠鏡
Research Abstract

Large-diameter high-precision antenmas such as Nobeyama 45 m telescope and IRAM 30 m telescope have been used for millimeter and submillimeter wave radio astronomy. High-resolution surface mesurering techniques are very important to improve the surface accuracy of these antennas. Recently, radio holography is universally used for this purpose. But, the research has been needed to achieve highest possible accuracy in applying this technique to large-diameter antennas used for millimeter and submillimeter wave length.
In this Grant-in-Aid for Developmental Scientific Research, a Radio holography system using geostationary satellite signals was developed. The system consists of 2-channel correlation receiver, control system, and softwares for data reduction. As a transmitter, radio beacon signals at 19.45 GHz from the Japanese communications satellites CS-2a and 2b were used. we succeeded in developing the system which has good phase stability, high sensitivity, and good isolation.
By the use of this system, the surface of the 45 m telescope was measured 53 times in total in both 64x64 (resolution 86 cm) and 128x128 (resolution 43 cm) measurements in October 1985 and August 1986. Based on the measurements of best repeatability, the surface was adjusted and improved from 200 m rms to 150 m rms. Valuable results were obtained for future developments from the analysis of errors, experiments to reduce the effect of scattered wave, and computer simulations to investigate the effect of pointing error.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Masato ISHIGURO: Symposium Digest of IEEE AP-S International Symposium. Vo1.2. 531-534 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石黒正人: 電子情報通信学会創立70周年記念総合全国大会(昭和62年)講演論文集. 分冊3. 3・297-3・298 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石黒正人: 電子情報通信学会技術報告. Vo1.87No.91. 67-74 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石黒正人: 電子情報通信学会技術報告. Vo1.87No.91. 75-80 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Masato ISHIGURO: "Improvement of the surface Accuracy of the Nobeyama 45-m Telescope using Radio Holographic Metrology" Symposium Digest of IEEE AP-S International symposium. Vol.2. 531-534 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masato ISHIGURO: "Surface Measurement of large Millimeter-Wave Antenna by Radio Holography" National Convention Record, 1987. The Institute of Electronics, Information and Communication on Engineers. Part3. 3-297-3-298 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masato ISHIGURO: "Developement of a High-Resolution Surface Measuring System Using Radio Holography" IEICE Technical Report. Vol.87, No.91. 67-74 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masato ISHIGURO: "Influence of Aperture Illumination on the surface Measurement Error Using Radio Holographic Metrology" IEICE Technical Report. Vol.87, No.91. 75-80 (1987)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1990-03-20  

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