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  Far-infrared space interferometer study IRASSI: motivation, principle design, and technical aspects

Linz, H., Buinhas, L., Förstner, R., Lezius, M., Bhatia, D., Batzdorfer, S., et al. (2018). Far-infrared space interferometer study IRASSI: motivation, principle design, and technical aspects.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CC84-0 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CC85-F
Genre: Proceedings

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https://ui.adsabs.harvard.edu/abs/2018SPIE10698E..52L (Any fulltext)
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 Creators:
Linz, Hendrik1, Author
Buinhas, Luisa1, Author
Förstner, Roger1, Author
Lezius, Matthias1, Author
Bhatia, Divya1, Author
Batzdorfer, Simon1, Author
Beha, Katja1, Author
Bestmann, Ulf1, Author
Eissfeller, Bernd1, Author
Eren Copur, Meltem1, Author
Ferrer, Eloi1, Author
Frankl, Kathrin1, Author
Krause, Oliver1, Author
Moon, Yongjin1, Author
Philips-Blum, Mathias1, Author
Scheithauer, Silvia1, Author
Steen, Meiko1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: Far-Infrared Heterodyne Interferometry Formation Flying Laser Metrology
 Abstract: The far-infrared (FIR) regime is one of the few wavelength ranges where no astronomical data with sub-arcsecond spatial resolution exist yet. Also medium-term satellite projects like SPICA, Millimetron or OST will not 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 CO and especially from water lines would open the door for transformative science. These demands call for interferometric 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 5 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 employing laser frequency combs, for which first ground-based tests have been designed by members of our study team. In this contribution, we first give a motivation how the science requirements translated 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, quasi in real-time. We also address questions regarding the spacecraft architecture and how a first thermomechanical 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.

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 Dates: 2018
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: ISBN: 9781510619494
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Title: Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Place of Event: -
Start-/End Date: 2018

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