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The PRISMA Mission Hyperspectral Payload
The PRISMA (PRecursore IperSpettrale della Missione Applicativa) Programme is an ASI (Agenzia Spaziale Italiana) hyperspectral mission for Earth observation based on a mono-payload satellite. An Italian Consortium is in charge to realize the mission; Selex ES has the full responsibility of the hyperspectral payload, composed by a high spectral resolution spectrometer optically integrated with a medium resolution panchromatic camera, and the related calibration activities. PRISMA, from a sun-synchronous orbit at about 620 km altitude, acquires areas with a swath width of 30 km with a Ground Sampling Distance (GSD) of 30 m, covering the wavelength range from 400 nm to 2500 nm with two partially overlapped spectrometer channels dedicated to VNIR and SWIR. Simultaneously, a panchromatic camera acquires the same area with a spatial resolution of 5 m GSD. The optical design is based on a high transmittance optical assembly, including a reflective common telescope in Three-Mirror Anastigmat (TMA) configuration, a single slit aperture, a panchromatic camera (700-900 nm) and a spectrometer with two channels (VNIR and SWIR), spectrally separated by a beam splitter, using prisms as dispersive media in a configuration conceived to minimize the number of optical elements. High performance MCT-based detectors represent the core of the instrument. To provide the required data quality for the entire mission lifetime of 5 years, an accurate and stable on-board calibration unit, both radiometric and spectral, will guarantee continuous in-flight instrument calibration. The thermal design is based on a cold-biased, passive cooling system: a double stage radiator, suitable oriented and protected from environmental heat fluxes, high performance cryogenic heat pipes and an operational heaters network is the solution adopted to achieve the required thermal stability. PRISMA is scheduled to be launched in 2018.
Meini Marco, Fossati Enrico, Giunti Lorenzo, Molina Marco, Formaro Roberto, Longo Francesco, Varacalli Giancarlo
Paper for Seminar/Symposium/Conference
IAC 2015 - International Astronautical Congress (12-16 October 2015, Jerusalem, Israel)
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