Design of a high update-rate star sensor for arcsec-level attitude determination from balloon-borne X/γ astronomy platforms |
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| Authors: | G Palladino A Basili G Di Cocco T Franceschini G Landini S Silvestri A Barbini M Galimberti L A Gizzi |
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| Institution: | (1) IASF, Istituto di Astrofisica Spaziale e Fisica cosmica, INAF – Sezione di Bologna, 40129 Bologna, Italy;(2) Dep. of Physics, University of Ferrara, Ferrara, Italy;(3) IPCF, Istituto per i Processi Chimico-Fisici, CNR – Area di Pisa, 56124 Pisa, Italy |
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| Abstract: | This paper describes the design of a star sensor based upon a high dynamic range CCD in order to reach an arcsec-level attitude
determination in balloon-borne missions. A custom star identification software was developed and laboratory-tested on a prototype
assembled using commercial components. A set of numerical simulations have been carried out to study the dependence on the
pointing precision of the centroid position accuracy, the number of detected stars and the effect of the image focusing. Moreover,
the role of the electronic noise and the discrete pixel structure on the light signals is identified by the analysis of numerical
simulations. Laboratory tests confirm that the arcsec pointing accuracy with a 1 Hz update rate can be achieved with our combination
of custom-developed software and selected hardware components. |
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| Keywords: | Star sensor CCD Balloon-borne Attitude control Pointing precision X-ray telescopes |
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