惑星観測用成層圏望遠鏡 FUJIN-1の開発とポインティング制御系の性能評価(大気球研究報告)  [in Japanese] Development of the Stratospheric Telescope for Observations of Planets - FUJIN-1 - and Evaluation of the Pointing Control System  [in Japanese]

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Abstract

地上望遠鏡を使った高分解能光学撮像において,シーイングは最も重要な条件である.成層圏環境は気流が安定しており,密度も地上の 1/100程度と,天体の光学観測に適している.このような成層圏環境の利点を活用することによって,口径が 1 m以下の比較的小規模な望遠鏡でも,口径数 mの地上大型望遠鏡に匹敵する分解能での観測が可能になると期待される.この点に着目して我々は惑星観測を行うための極周回成層圏テレスコープ(風神, FUJIN)を提案し, 2002年より開発を行ってきた. 2009年にはプロトタイプによる最初の飛翔試験を実施したものの,飛翔中に搭載 CPUがハングアップしたため十分な成果を残すことができなかった.再度 2013年に国内で飛翔実験するために,発生した不具合等に対処した FUJIN-1システムを開発した.飛翔実験自体は気象条件が整わず,また気球飛翔制御システムに問題が発生したために実施できなかったものの, FUJIN-1システムはポインティング機能の性能確認を中心とした地上試験を経て,完全なフライトレディ状態で待機していた.地上でのポインティング性能確認試験によって, FUJIN-1搭載望遠鏡の回折限界未満である 0.4"(σ)のポインティング精度を確認した.この結果を受けて FUJIN-1の開発を終了し,極域での実験を行うため FUJIN-2の開発を開始した.本稿では FUJINの概要を説明し,今回開発した FUJIN-1システムと地上ポインティング試験について述べる.

Seeing is the most important condition for high spatial resolution optical imaging by a ground-based telescope. The stable wind and low atmospheric density in the stratosphere provide ideal environment for optical observations of celestial objects. Taking advantages of the stratospheric environment even a small telescope with a sub-meter diameter main mirror can realize high spatial resolution imaging comparable to those by huge ground-based telescopes with a several-meter diameter. The circumpolar balloon-borne telescope, FUJIN, is a telescope floating in the polar stratosphere for optical observations of planets. Since the FUJIN was proposed in 2002, the flight system has been developed. The first flight test was conducted in 2009 to be failed due to hung-up of the onboard CPU. Improvement and further development has been continued, and then the FUJIN-1 flight model was rolled out in 2013. Unfortunately the flight experiment in 2013 was canceled due to the bad wind condition and some troubles in the balloon control system, respectively. However the functions of the FUJIN-1 were evaluated in the ground tests, and the flight model stood by as`flight ready.'In the tests the pointing control system of the telescope, which is the key mechanism for the FUJIN-1, was tested and evaluated to be capable of suppressing the pointing error within 0.4"(σ) which is smaller than the diffraction limit of the FUJIN-1 main telescope. From these results it has been decided that the development of the FUJIN-1 has been completed, and the development of the FUJIN-2, the flight system for longer flight duration in the northern polar region has been started. In this article the outline of the FUJIN project, the FUJIN-1 flight system and the ground test results of the pointing control functionality are introduced.

Journal

  • JAXA research and development report

    JAXA research and development report JAXA-RR-13-011, 87-105, 2014-03

    Japan Aerospace Exploration Agency

Codes

  • NII Article ID (NAID)
    110009799495
  • NII NACSIS-CAT ID (NCID)
    AA1192675X
  • Text Lang
    JPN
  • ISSN
    13491113
  • Data Source
    NII-ELS 
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