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Proceedings Paper • Open Access

An all-metallic high resolution instrument for earth observation from small LEO satellites
Author(s): I. Ferrario; R. Ghislanzoni; L. Maresi; M. Rossi; M. Taccola; P. Zago; F. E. Zocchi

Paper Abstract

A mid-to-high resolution optical payload, named STREEGO, featuring a compact envelope, reduced mass, and competitive cost has been designed to address Earth Observation applications from low Earth orbit (LEO) small satellites. STREEGO is a fully reflective telescope designed for operation at a nominal altitude of 600 km to provide a ground sampling distance (GSD) of 2.75 m, a field of view of about 1° and a modulation transfer function (MTF) greater than 10% at Nyquist frequency (91 cy/mm) with a telescope aperture of 200 mm. A large two-dimensional CMOS sensor with a pixel size of 5.5 μm has been selected in order to obtain the requested GSD with a focal length of 1.2 m, and a signal-to-noise ratio equal to 75. A demonstration model is in the detailed design phase and will be developed, with completion planned by end of 2015. We present a detailed description of the instrument, which, by leveraging on aspheric surfaces and light-weight solutions, achieves remarkable performance in terms of compactness and image quality with less than 25 kg in mass. The optical design is based on a three mirror anastigmat (TMA) configuration whereby the mirrors are realized in metal with the same coefficient of thermal expansion of the structure in order to obtain an athermal design.

Paper Details

Date Published: 17 November 2017
PDF: 9 pages
Proc. SPIE 10563, International Conference on Space Optics — ICSO 2014, 105632P (17 November 2017); doi: 10.1117/12.2304255
Show Author Affiliations
I. Ferrario, Media Lario Technologies (Italy)
R. Ghislanzoni, Media Lario Technologies (Italy)
L. Maresi, ESA-ESTEC (Netherlands)
M. Rossi, Media Lario Technologies (Italy)
M. Taccola, ESA-ESTEC (Netherlands)
P. Zago, Media Lario Technologies (Italy)
F. E. Zocchi, Media Lario Technologies (Italy)

Published in SPIE Proceedings Vol. 10563:
International Conference on Space Optics — ICSO 2014
Zoran Sodnik; Bruno Cugny; Nikos Karafolas, Editor(s)

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