The deployable telescope: a cutting-edge solution for high spatial and temporal resolved Earth observation

The deployable telescope: a cutting-edge solution for high spatial and temporal resolved Earth observation
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可展开望远镜：高时空分辨率地球观测的尖端解决方案

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发表时间：
2018
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通讯作者：
Víctor Villalba Corbacho
Víctor Villalba Corbacho
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文献类型：
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作者：
D. Dolkens;Hans Kuiper;Víctor Villalba Corbacho

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摘要提高对地观测（EO）的空间和时间分辨率是科学和社会应用的最终驱动力。然而，像DigitalGlobe的Worldview-3这样的最先进的EO任务非常昂贵。此外，该系统具有2800公斤的高质量和约15公里的有限扫描带宽度，这限制了时间分辨率。在这篇文章中，我们介绍了可部署空间望远镜（DST）项目的现状，该项目已在德尔夫特理工大学运行了6年，作为解决这一问题的前沿解决方案。可展开光学系统具有革新高分辨率光电领域的潜力。通过将望远镜的主镜（M1）分成可展开的部分，并将次镜（M2）放置在可展开的吊杆上，望远镜的发射体积可以减少4倍或更多，从而大大降低发射成本。这允许更大的EO星座，提供比现有解决方案更好的重访时间的图像数据。以Wordview-3为基础的DST规格基线旨在从500公里的轨道高度提供地面分辨率为25厘米（全色450-650纳米）的图像。本文介绍了光学、热机械和主动光学系统设计的现状。并行设计方法结合严格的自底向上和自顶向下兼容的系统工程方法表明，DST是一个健康的系统概念。
Abstract The increase of spatial and temporal resolution for Earth observation (EO) is the ultimate driver for science and societal applications. However, the state-of-the-art EO missions like DigitalGlobe’s Worldview-3, are very costly. Moreover, this system has a high mass of 2800 kg and limited swath width of about 15 km which limits the temporal resolution. In this article, we present the status of the deployable space telescope (DST) project, which has been running for 6 years now at the Delft University of Technology, as a cutting-edge solution to solve this issue. Deployable optics have the potential of revolutionising the field of high resolution EO. By splitting up the primary mirror (M1) of a telescope into deployable segments and placing the secondary mirror (M2) on a deployable boom, the launch volume of a telescope can be reduced by a factor of 4 or more, allowing for much lower launch costs. This allows for larger EO constellations, providing image data with a much better revisit time than existing solutions. The DST specification baseline, based on Wordview-3, aims to provide images with a ground resolution of 25 cm (panchromatic 450–650 nm) from an orbital altitude of 500 km. In this paper, the current status of the optical, thermo-mechanical, and active optics systems design are described. The concurrent design approach combined with a strict bottom-up and top-down compliant systems engineering approach show that the DST is a healthy system concept.