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Saathof, R. (author), Kuiper, S. (author), Crowcombe, W.E. (author), de Man, H. (author), de Lange, T.J. (author), van der Valk, N.C.J. (author), Kramer, L. (author), Fritz, E.C. (author)Optical communications will complement radio frequency (RF) communications in the coming decades to enhance throughput, power efficiency and link security of satellite communication links. To enable optical communications technology for intersatellite links and (bi-directional) ground to satellite links, TNO develops a suite of technologies in...conference paper 2019
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Mora, A. (author), Biermann, M. (author), Bombrun, A. (author), Boyadjian, J. (author), Chassat, F. (author), Corberand, P. (author), Davidson, M. (author), Doyle, D. (author), Escolar, D. (author), Gielesen, W.L.M. (author), Guilpain, T. (author), Hernandez, J. (author), Kirschner, V. (author), Klioner, S.A. (author), Koeck, C. (author), Laine, B. (author), Lindegren, L. (author), Serpell, E. (author), Tatry, P. (author), Thoral, P. (author)The Gaia all-sky astrometric survey is challenged by several issues affecting the spacecraft stability. Amongst them, we find the focus evolution, straylight and basic angle variations Contrary to pre-launch expectations, the image quality is continuously evolving, during commissioning and the nominal mission. Payload decontaminations and...conference paper 2016
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Korkiakoski, V. (author), Keller, C.U. (author), Doelman, N.J. (author), Fraanje, P.R. (author), Verhaegen, M. (author)We study different possibilities to use adaptive optics (AO) and phase diversity (PD) together in a jointly optimized system. The potential of the joint system is demonstrated through numerical simulations. We find that the most significant benefits are obtained from the improved deconvolution of AO-corrected wavefronts and the additional...article 2012
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TNO Industrie en Techniek (author), Vosteen, L.L.A. (author), Draaisma, F. (author), Werkhoven, W.P. (author), Riel, L.J.M. (author), Mol, M.H. (author), Den, O.G. (author)TNO developed a Wave Front Sensor (WFS) instrument for the GAIA mission. This Wave Front Sensor will be used to monitor the wave front errors of the two main telescopes mounted on the GAIA satellite, which may be corrected by a 5- degree of freedom (DOF) mechanism during operation. The GAIA-WFS will operate over a broad wavelength (450 to 900 nm...conference paper 2009