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The Sea and Land Surface Temperature Radiometer (SLSTR) Detection Assembly design and performance
The SLSTRs are high accuracy radiometers selected for the Copernicus mission Sentinel-3 space component to provide Sea Surface Temperature (SST) data continuity respect to previous (A)ATSRs for climatology. Many satellites, each with 7.5-year lifetime, over a 20-year period are foreseen. Sentinel-3A will be launched in 2015 and Sentinel-3B at least 6 months later implying that two identical satellites will be maintained in the same orbit with 180° phase delay. Each SLSTR has an improved design with respect to AATSR affording wider near nadir and oblique view swaths (1400 and 740 km) for SST/LST global coverage at 1 km spatial resolution (at SSP) with a daily revisit time (with two satellites), appropriate for climate and meteorology. Cloud screening and other products are obtained with 0.5 Km spatial resolution (at SSP) in visible and SWIR bands while two additional channels are included to monitor high temperature events, such as forest fires. The two swaths are obtained with two conical scans and telescopes combined optically at a common focus, representing the input of a cooled Focal Plane Assembly, where nine channels are separated with dichroic and focalized on detectors with appropriate optical relays. IR and SWIR optics/detectors are cooled to 85 K by an active mechanical cryo-cooler with vibration compensation, while the VIS ones are maintained at a stable temperature. The opto-mechanical design and the expected electro-optical performance of the Focal Plane Assembly are described and the models predictions at system level are compared with experimental data acquired in the vacuum chamber in flight representative thermal conditions or in laboratory.
Coppo Peter Mario, Mastrandrea Carmine Alessio, Stagi Moreno, Calamai Luciano, Nieke Jens
Paper for Specialistic Magazine
SPIE - Journal of Applied Remote Sensing ( Volume 8, Issue 1, 01 July 2014)
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