Metrology on-board PROBA-3: The shadow position sensors subsystem |
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Authors: | Vladimiro Noce Davide Loreggia Gerardo Capobianco Silvano Fineschi Alessandro Bemporad Marta Casti Steven Buckley Marco Romoli Mauro Focardi Massimiliano Belluso Cédric Thizy Aline Hermans Damien Galano Jorg Versluys |
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Institution: | 1. INAF-Arcetri Astrophysical Observatory, Largo E. Fermi, 5, I-50125 Florence, Italy;2. University of Florence, Department of Physics and Astronomy, Via Sansone 1, I-50019 Sesto Fiorentino, Italy;3. INAF-Turin Astrophysical Observatory, Via Osservatorio, 20, I-10025 Pino Torinese, Italy;4. P/L, Aerospace Technologies and Facilities – ALTEC Torino, Italy;5. ON Semiconductor, 6800 Airport Business Park, Cork, Ireland;6. INAF-Catania Astrophysical Observatory, Via S. Sofia, 78, I-95123 Catania, Italy;7. Centre Spatial de Liege, Av. du Pre Aily, 4031 Liege, Belgium;8. European Space Agency, Keplerlaan 1, 2201 AZ Noordwijk, the Netherlands |
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Abstract: | PROBA-3 is an ESA mission aimed at the demonstration of formation flying performance of two satellites that will form a giant coronagraph in space. The first spacecraft will host a telescope imaging the solar corona in visible light, while the second, the external occulter, will produce an artificial eclipse. This instrument is named ASPIICS (Association of Spacecraft for Polarimetric and Imaging Investigation of the Corona of the Sun). To accomplish the payload's scientific tasks, PROBA-3 will ensure sub-millimeter reciprocal positioning of its two satellites using closed-loop on-board metrology. Several metrology systems will be used and the Shadow Position Sensor (SPS) subsystem senses the penumbra around the instrument aperture and returns the 3-D displacement of the coronagraph satellite, with respect to its nominal position, by running a dedicated algorithm. In this paper, we describe how the SPS works and the choices made to accomplish the mission objectives. |
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Keywords: | Formation-flying Sun pointing Coronagraphy SiPM (Silicon Photomultipliers) SPS (Shadow Position Sensor) On-board metrology |
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