PROBA-3 mission and the Shadow Position Sensors: Metrology measurement concept and budget |
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Authors: | Davide Loreggia Silvano Fineschi Gerardo Capobianco Alessandro Bemporad Marta Casti Federico Landini Gianalfredo Nicolini Luca Zangrilli Giuseppe Massone Vladimiro Noce Marco Romoli Luca Terenzi Gianluca Morgante Massimiliano Belluso Cedric Thizy Camille Galy Aline Hermans Pierre Franco Luciano Accatino |
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Institution: | 1. INAF-Astrophysical Observatory of Turin, Via Osservatorio, 20, 10025 Pino Torinese, Turin, Italy;2. INAF-Astrophysical Observatory of Arcetri, Largo E. Fermi, 5, 50125 Florence, Italy;3. University of Florence, Department of Astronomy, Via Sansone 1, 50019 Florence, Italy;4. INAF-Astrophysical Observatory of Bologna, Via Piero Gobetti, 93/3, 40129 Bologna, Italy;5. INAF-Astrophysical Observatory of Catania, Via S.Sofia, 78, 95123 Catania, Italy;6. Centre Spatial de Liege, Av. du Pre Aily, 4031 Liege, Belgium;7. ON Semiconductor Building 6800, Avenue 6000 Cork Airport Business Park, Cork T12 CDF7, Ireland;8. European Space Agency, Keplerlaan 1, 2201 AZ Noordwijk, the Netherlands;9. Ac-Consulting, Via Trieste, 16/B, 10098 Rivoli, Turin, Italy;10. ALTEC S.p.A., Corso Marche, 79, 10146 Torino TO, Italy |
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Abstract: | PROBA-3 is a space mission of the European Space Agency that will test, and validate metrology and control systems for autonomous formation flying of two independent satellites. PROBA-3 will operate in a High Elliptic Orbit and when approaching the apogee at 6·104 Km, the two spacecraft will align to realize a giant externally occulted coronagraph named ASPIICS, with the telescope on one satellite and the external occulter on the other one, at inter-satellite distance of 144.3 m. The formation will be maintained over 6 hrs across the apogee transit and during this time different validation operations will be performed to confirm the effectiveness of the formation flying metrology concept, the metrology control systems and algorithms, and the spacecraft manoeuvring. The observation of the Sun’s Corona in the field of view 1.08;3.0]RSun will represent the scientific tool to confirm the formation flying alignment. In this paper, we review the mission concept and we describe the Shadow Position Sensors (SPS), one of the metrological systems designed to provide high accuracy (sub-millimetre level) absolute and relative alignment measurement of the formation flying. The metrology algorithm developed to convert the SPS measurements in lateral and longitudinal movement estimation is also described and the measurement budget summarized. |
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Keywords: | Space mission Formation flying Coronagraph Satellite constellation Solar physics High accuracy metrology |
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