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Proceedings Paper

Geometrical distortion calibration of the stereo camera for the BepiColombo mission to Mercury
Author(s): Emanuele Simioni; Vania Da Deppo; Cristina Re; Giampiero Naletto; Elena Martellato; Donato Borrelli; Michele Dami; Gianluca Aroldi; Iacopo Ficai Veltroni; Gabriele Cremonese
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Paper Abstract

The ESA-JAXA mission BepiColombo that will be launched in 2018 is devoted to the observation of Mercury, the innermost planet of the Solar System. SIMBIOSYS is its remote sensing suite, which consists of three instruments: the High Resolution Imaging Channel (HRIC), the Visible and Infrared Hyperspectral Imager (VIHI), and the Stereo Imaging Channel (STC). The latter will provide the global three dimensional reconstruction of the Mercury surface, and it represents the first push-frame stereo camera on board of a space satellite. Based on a new telescope design, STC combines the advantages of a compact single detector camera to the convenience of a double direction acquisition system; this solution allows to minimize mass and volume performing a push-frame imaging acquisition. The shared camera sensor is divided in six portions: four are covered with suitable filters; the others, one looking forward and one backwards with respect to nadir direction, are covered with a panchromatic filter supplying stereo image pairs of the planet surface. The main STC scientific requirements are to reconstruct in 3D the Mercury surface with a vertical accuracy better than 80 m and performing a global imaging with a grid size of 65 m along-track at the periherm. Scope of this work is to present the on-ground geometric calibration pipeline for this original instrument. The selected STC off-axis configuration forced to develop a new distortion map model. Additional considerations are connected to the detector, a Si-Pin hybrid CMOS, which is characterized by a high fixed pattern noise. This had a great impact in pre-calibration phases compelling to use a not common approach to the definition of the spot centroids in the distortion calibration process. This work presents the results obtained during the calibration of STC concerning the distortion analysis for three different temperatures. These results are then used to define the corresponding distortion model of the camera.

Paper Details

Date Published: 29 July 2016
PDF: 19 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990410 (29 July 2016); doi: 10.1117/12.2232639
Show Author Affiliations
Emanuele Simioni, CNR-Institute for Photonics and Nanotechnologies (Italy)
Vania Da Deppo, CNR-Institute for Photonics and Nanotechnologies (Italy)
INAF - Astronomical Observatory Padova (Italy)
Cristina Re, INAF - Astronomical Observatory Padova (Italy)
Giampiero Naletto, CNR-Institute for Photonics and Nanotechnologies (Italy)
INAF - Astronomical Observatory Padova (Italy)
Univ. of Padova (Italy)
Elena Martellato, INAF - Astronomical Observatory Padova (Italy)
Donato Borrelli, LEONARDO Spa (Italy)
Michele Dami, LEONARDO Spa (Italy)
Gianluca Aroldi, LEONARDO Spa (Italy)
Iacopo Ficai Veltroni, LEONARDO Spa (Italy)
Gabriele Cremonese, INAF - Astronomical Observatory Padova (Italy)


Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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