CO.RI.S.T.A. is involved in a research project funded by ASI (Italian Space Agency), named MITAR, to realise a very compact, lightweight deployable telescope in visible wavelength range to get earth images from microsatellite. The satellite considered for the study is SMART, an Italian academic multi-mission microsatellite operating on circular sun-synchronous orbits. The telescope has a Cassegrain configuration with a parabolic primary mirror and an hyperbolic secondary mirror. This configuration guaranties the best aberrations corrections and the best compactness. The primary and the secondary mirror are 40 cm and 10 cm in diameter respectively, while their relative distance is 52cm. Mirrors will be realised with innovative composite material to obtain lightweight optical elements. Thanks to its limited size and light weight, the system can be easily deployed. The deployable structure will keep the secondary mirror close to the primary one during launch phases. Once in orbit, a system of lenticular tape springs and dumpers will extend the structure. The structure will be enclosed in multilayer blankets that will shield the sensor from light and will thermally stabilize the structure, preventing excessive thermal deformation. The images will be detected by a very high resolution CCD camera installed onboard the satellite.
CO.RI.S.T.A. (Consortium of Research on Advanced Remote Sensing Systems) performed a feasibility study funded by Italian Space Agency (ASI) to develop a rangefinder system as payload for microsatellite. The satellite considered for the study is UNISAT, an Italian academic satellite. The studied rangefinder offers the possibility to correct the systematic error of stereoscopic images acquired by MHRRC camera (Miniaturised High-Resolution Reconnaissance Camera) integrated on board the satellite. In order to carry out a compact and reliable altimeter for satellite UNISAT a review and comparison have been made with rangefinder systems both for the microwaves (radar systems) and for the visible infrared wavelength range (laser systems). A pulsed laser altimeter
system based on Time Of Flight measurement appears the more suitable for the aforementioned application.