Prof. Roger Förstner Profile

Prof. Roger Förstner

Institute Director at Univ der Bundeswehr München

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Publications (3)

Proceedings Article | 19 November 2024 Paper

GNSS-R measurement campaign: processing and analysis of reflected signals

Adonees Semaan, Tom Andert, Roger Förstner

Proceedings Volume 13195, 131950F (2024) https://doi.org/10.1117/12.3031697

KEYWORDS: Specular reflections, Reflection, Doppler effect, Antennas, Receivers, Satellite navigation systems, Global Positioning System, Signal processing, Reflectometry, Transmitters

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Proceedings Article | 13 June 2023 Presentation + Paper

Data pipeline of a multi-spectral satellite experiment for object detection and artificial intelligence-based processing

Markus Müller, Sanjay Swami, Benjamin Haser, Mohd Bilal, Artur Kinzel, Roger Förstner, Christian Mundt

Proceedings Volume 12521, 125210N (2023) https://doi.org/10.1117/12.2663468

KEYWORDS: Object detection, Image processing, RGB color model, Satellites, Clouds, Data modeling, Infrared imaging, Education and training, Artificial intelligence, Earth observing sensors

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Proceedings Article | 6 July 2018 Paper

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

Hendrik Linz, Luisa Buinhas, Roger Förstner, Matthias Lezius, Divya Bhatia, Simon Batz-dorfer, Katja Beha, Ulf Bestmann, Bernd Eissfeller, Meltem Eren Copur, Eloi Ferrer, Kathrin Frankl, Oliver Krause, Yongjin Moon, Mathias Philips-Blum, Silvia Scheithauer, Meiko Steen

Proceedings Volume 10698, 1069852 (2018) https://doi.org/10.1117/12.2313801

KEYWORDS: Satellites, Telescopes, Space telescopes, Interferometers, Spatial resolution, Interferometry, Optical correlators, Terahertz radiation, Space operations, Far infrared

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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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