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InfraRed Astronomy Satellite Swarm Interferometry (IRASSI): Overview and study results

机译：红外天文卫星群干涉测量（Irassi）：概述和研究结果

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摘要

The far-infrared (FIR) regime is one of the few wavelength ranges where no astronomical data with sub-arcsecond spatial resolution exist yet. Neither of the medium-term satellite projects like SPICA, Millimetron or OST will resolve this malady. For many research areas, however, information at high spatial and spectral resolution in the FIR, taken from atomic fine-structure lines, from highly excited carbon monoxide (CO) and especially from water lines would open the door for transformative science. These demands call for inter-ferometric concepts. We present here first results of our feasibility study IRASSI (Infrared Astronomy Satellite Swarm Interferometry) for an FIR space interferometer. Extending on the principal concept of the previous study ESPRIT, it features heterodyne interferometry within a swarm of five satellite elements. The satellites can drift in and out within a range of several hundred meters, thereby achieving spatial resolutions of ＜0.1 arcsec over the whole wavelength range of 1-6 THz. Precise knowledge on the baselines will be ensured by metrology methods employing laser-based optical frequency combs, for which preliminary ground-based tests have been designed by members of our study team. We first give a motivation on how the science requirements translate into operational and design parameters for IRASSI. Our consortium has put much emphasis on the navigational aspects of such a free-flying swarm of satellites operating in relatively close vicinity. We hence present work on the formation geometry, the relative dynamics of the swarm, and aspects of our investigation towards attitude estimation. Furthermore, we discuss issues regarding the real-time capability of the autonomous relative positioning system, which is an important aspect for IRASSI where, due to the large raw data rates expected, the interferometric correlation has to be done onboard, in quasi-real-time. We also address questions regarding the spacecraft architecture and how a first thermome-chanical model is used to study the effect of thermal perturbations on the spacecraft. This will have implications for the necessary internal calibration of the local tie between the laser metrology and the phase centres of the science signals and will ultimately affect the accuracy of the baseline estimations.
机译：远红外线（FIR）制度是少数波长范围之一，其中还没有存在具有子散秒空间分辨率的天文数据。中期卫星项目都不是Spica，毫米僵尸或OST将解决这个疾病。然而，对于许多研究领域，来自杉木中的高空间和光谱分辨率的信息，从高兴奋的一氧化碳（CO）中取自原子细结构线，尤其是水线将打开转型科学的门。这些要求呼吁互相思考概念。我们在这里介绍我们可行性研究Irassi（红外天文卫星干涉测量学）的首先结果，用于冷杉空间干涉仪。延伸以前研究ESPRIT的主要概念，它在五种卫星元素中具有外差干涉测量法。卫星可以在几百米范围内漂移进出，从而在整个波长范围内实现<0.1弧度的空间分辨率。通过采用基于激光的光学频率梳理的计量方法确保基于基于激光的光学频率的精确知识，其中我们的研究团队成员设计了初步地面的测试。我们首先对科学需求转化为Irassi的操作和设计参数的动机。我们的财团强调了这种在相对较近的附近运营的自由飞行卫星的导航方面。因此，我们对地层几何的工作，群体的相对动态以及我们对态度估计的调查的方面。此外，我们讨论了关于自主相对定位系统的实时能力的问题，这是Irassi的一个重要方面，在其中，由于预期的大原始数据速率，在准真实中必须在船上进行干涉相关性 - 时间。我们还解决了有关航天器架构的问题以及第一热组合模型如何用于研究热扰动对航天器的影响。这将对激光计量与科学信号相位中心之间的局部领带的必要内部校准产生影响，并最终会影响基线估计的准确性。

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  • 来源
    《Advances in space research》 |2020年第2期|831-849|共19页
  • 作者

    Hendrik Linz; Divya Bhatia; Luisa Buinhas; Matthias Lezius; Eloi Ferrer; Roger Foerstner; Kathrin Frankl; Mathias Philips-Blum; Meiko Steen; Ulf Bestmann; Wolfgang Haensel; Ronald Holzwarth; Oliver Krause; Thomas Pany;

  • 作者单位

    MPIA Heidelberg Koenigstuhl 17 69117 Heidelberg Germany;

    Institul fuer Flugfuehrung TU Braunschweig Hermann-Blenk-Str. 27 D-38108 Braunschweig Germany;

    Universitdt der Bundeswehr Muenchen Werner-Heisenberg- Weg 39 D-85577 Neubiberg Germany;

    Menlo Systems GmbH Am Klopferspitz 19a D-82152 Martinsried Germany;

    Universitdt der Bundeswehr Muenchen Werner-Heisenberg- Weg 39 D-85577 Neubiberg Germany;

    Universitdt der Bundeswehr Muenchen Werner-Heisenberg- Weg 39 D-85577 Neubiberg Germany;

    Universitdt der Bundeswehr Muenchen Werner-Heisenberg- Weg 39 D-85577 Neubiberg Germany;

    Universitdt der Bundeswehr Muenchen Werner-Heisenberg- Weg 39 D-85577 Neubiberg Germany;

    Institul fuer Flugfuehrung TU Braunschweig Hermann-Blenk-Str. 27 D-38108 Braunschweig Germany;

    Institul fuer Flugfuehrung TU Braunschweig Hermann-Blenk-Str. 27 D-38108 Braunschweig Germany;

    Menlo Systems GmbH Am Klopferspitz 19a D-82152 Martinsried Germany;

    Menlo Systems GmbH Am Klopferspitz 19a D-82152 Martinsried Germany;

    MPIA Heidelberg Koenigstuhl 17 69117 Heidelberg Germany;

    Universitdt der Bundeswehr Muenchen Werner-Heisenberg- Weg 39 D-85577 Neubiberg Germany;

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  • 正文语种 eng
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  • 关键词

    Far-infrared; Heterodyne interferometry; Formation flying; Laser metrology; Attitude estimation;

    机译：远红外线;外差干涉测量;形成飞行;激光计量;态度估计;

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