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In the conventional system approach, image stability requirements are met constraining the platform and instruments to a very quiet thermo-mechanical environment. Major limitations come from the difficulties to develop low noise reaction wheels and the huge mass penalty of a cold gas micropropulsion solution. For the GEO-HR mission, which targets 6-10 m spatial resolution from GEO, an active line of sight control is considered as a candidate solution.
THALES ALENIA SPACE...
Increasingly demanding space-based applications require a large primary mirror diameter, on which the optical instrument resolution depends. However, the mass and volume of a monolithic primary mirror would dramatically increase along with its size, which, in addition to cost and technical issues, is also limited by the available volumen in the launch vehicle fairing.
Thales Alenia Space
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