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Pointing Stability and Image Quality of the SOFIA Airborne Telescope during Initial Science Missions

机译：初始科学飞行任务期间SOFIA机载望远镜的指向稳定性和图像质量

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摘要

The Stratospheric Observatory for Infrared Astronomy (SOFIA) is an airborne observatory for astronomical observations at wavelengths ranging from 0.3-1600 jam. It consists of a telescope with an effective aperture of 2.5 m, which is mounted in a heavily modified Boeing 747SP. The aircraft features an open port cavity that gives the telescope an unobstructed view of the sky. Hence the optical system is subject to both aerodynamic loads from airflow entering the cavity, and to inertial loads introduced by motion of the airborne platform. A complex suspension assembly was designed to stabilize the telescope. Detailed end-to-end simulations were performed to estimate image stability based on the mechatronic design, the expected loads, and optical influence parameters [2]. In December 2010 SOFIA entered its operational phase with a series of Early Science flights, which have relaxed image quality requirements compared to the full operations capability. At the same time, those flights are used to characterize image quality and image stability in order to validate models and to optimize systems. Optimization of systems is not based on analytical models, but on models derived from system identification measurements that are performed on the actual hardware both under controlled conditions and operational conditions. This paper discusses recent results from system identification measurements, improvements to image stability, and plans for the further enhancement of the system.
机译：红外平流层天文​​台（SOFIA）是机载天文台，用于波长范围在0.3-1600 jam之间的天文观测。它由有效孔径为2.5 m的望远镜组成，该望远镜安装在经过改装的波音747SP中。该飞机具有开放式腔室，可为望远镜提供一览无余的天空视野。因此，光学系统既承受来自进入空腔的气流的气动载荷，又经受由机载平台的运动引入的惯性载荷。设计了复杂的悬架组件以稳定望远镜。进行了详细的端到端仿真，以基于机电设计，预期负载和光学影响参数估计图像稳定性[2]。在2010年12月，SOFIA进行了一系列“早期科学”飞行，进入了运营阶段，与完整的运行能力相比，它们对图像质量的要求有所降低。同时，这些飞行时间用于表征图像质量和图像稳定性，以验证模型并优化系统。系统的优化不是基于分析模型，而是基于从系统标识测量得出的模型，这些测量是在受控条件和操作条件下在实际硬件上执行的。本文讨论了系统识别测量的最新结果，图像稳定性的改进以及系统进一步增强的计划。

著录项

  • 来源
    《Integrated modeling of complex optomechanical systems》|2011年|p.833608.1-833608.11|共11页
  • 会议地点 Kiruna(SE)
  • 作者

    Ulrich Lampater; Paul Keas; Rick Brewster; Terry Herter; Juergen Wolf; Enrico Pfuller; Manuel Wiedemann; Stefan Teufel; Franziska Harms; Holger Jakob; Hans-Peter Roeser;

  • 作者单位

    Deutsches SOFIA Institut, University of Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany,SOFIA Airborne Systems Operations Center, NASA Dryden Flight Research Center,MS DAOF S231, Edwards, CA 93523, USA;

    Moog CSA Engineering, 2565 Leghorn St, Mountain View, CA 94043, USA;

    SOFIA Science Center, NASA Ames Research Center, MS N211, Moffett Field, CA 94035, USA;

    Center for Radiophysics and Space Research, Cornell University, 202 Space Sciences Building,Ithaca, NY 14853, USA;

    Deutsches SOFIA Institut, University of Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany,SOFIA Science Center, NASA Ames Research Center, MS N211, Moffett Field, CA 94035, USA;

    Deutsches SOFIA Institut, University of Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany,SOFIA Science Center, NASA Ames Research Center, MS N211, Moffett Field, CA 94035, USA;

    Deutsches SOFIA Institut, University of Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany,SOFIA Science Center, NASA Ames Research Center, MS N211, Moffett Field, CA 94035, USA;

    Deutsches SOFIA Institut, University of Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany,SOFIA Airborne Systems Operations Center, NASA Dryden Flight Research Center,MS DAOF S231, Edwards, CA 93523, USA;

    Kayser-Threde GmbH, Wolfratshauser StraBe 48, 81379 Munich, Germany;

    Deutsches SOFIA Institut, University of Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany,SOFIA Airborne Systems Operations Center, NASA Dryden Flight Research Center,MS DAOF S231, Edwards, CA 93523, USA;

    Deutsches SOFIA Institut, University of Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学仪器;
  • 关键词

    stratospheric observatory for infrared astronomy; airborne astronomy; structural dynamics; control engineering; pointing and control; operational modal analysis;

    机译：用于红外天文学的平流层天文​​台；空中天文学结构动力学；控制工程；指向和控制；运作模式分析;

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