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Proceedings Paper

System model of an image stabilization system
Author(s): Manuel Carmona; José María Gómez; David Roma; Albert Casas; Manel López; José Bosch; Atilà Herms; Josep Sabater; Reiner Volkmer; Frank Heidecke; Thorsten Maue; Eiji Nakai; Wolfgang Schmidt
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Paper Abstract

The Polarimetric and Helioseismic Imager (PHI) instrument is part of the remote instruments for the ESA Solar Orbiter (SO), which is scheduled to launch in 2017. PHI captures polarimetric images from the Sun to better understand our nearest star, the Sun. A set of images is acquired with different polarizations, and afterwards is processed to extract the Stokes parameters. As Stokes parameters require the subtraction of the image values, in order to get the desired quality it is necessary to have good contrast in the image and very small displacements between them. As a result an Image Stabilization System (ISS) is required. This paper is focused in the behavior and the main characteristics of this system. This ISS is composed of a camera, a tip-tilt mirror and a control system. The camera is based on a STAR1000 sensor that includes a 10 bits resolution high-speed Analog-to-Digital Converter (ADC). The control system includes a Correlation Tracking (CT) algorithm that determines the necessary corrections. The tip-tilt mirror is moved based on this corrections to minimize the effects of the spacecraft (S/C) drift and jitter with respect to the Sun. Due to its stringent requirements, a system model has been developed in order to verify that the required parameters can be satisfied. The results show that the ISS is feasible, although the margins are very small.

Paper Details

Date Published: 4 August 2014
PDF: 15 pages
Proc. SPIE 9150, Modeling, Systems Engineering, and Project Management for Astronomy VI, 91501U (4 August 2014); doi: 10.1117/12.2054867
Show Author Affiliations
Manuel Carmona, Univ. de Barcelona (Spain)
José María Gómez, Univ. de Barcelona (Spain)
David Roma, Univ. de Barcelona (Spain)
Albert Casas, Univ. de Barcelona (Spain)
Manel López, Univ. de Barcelona (Spain)
José Bosch, Univ. de Barcelona (Spain)
Atilà Herms, Univ. de Barcelona (Spain)
Josep Sabater, Univ. de Barcelona (Spain)
Reiner Volkmer, Kiepenheuer-Institut für Sonnenphysik (Germany)
Frank Heidecke, Kiepenheuer-Institut für Sonnenphysik (Germany)
Thorsten Maue, Kiepenheuer-Institut für Sonnenphysik (Germany)
Eiji Nakai, Kiepenheuer-Institut für Sonnenphysik (Germany)
Wolfgang Schmidt, Kiepenheuer-Institut für Sonnenphysik (Germany)

Published in SPIE Proceedings Vol. 9150:
Modeling, Systems Engineering, and Project Management for Astronomy VI
George Z. Angeli; Philippe Dierickx, Editor(s)

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