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Focus on PRISMA Hyperspectral Image Simulator: functionalities and applications
PRISMA (PRecursore IperSpettrale della Missione Applicativa) is an Italian hyperspectral mission, scheduled for launch in 2018. It is an Earth Observation project fully founded by the Italian Space Agency (ASI; Agenzia Spaziale Italiana). The PRISMA Mission aims at qualifying the technology, developing applications and providing products to institutional and scientific users for environmental observation and risk management. Several fields may benefit from the scientific use of the PRISMA product: agriculture and forest, geology, urban areas and water resources. The PRISMA satellite will be placed on a sun-synchronous orbit at 620 Km nominal altitude, embarking a state-of-the-art hyperspectral and panchromatic payload able to acquire areas with a 30 km swath width. The hyperspectral sensor, with a Ground Sampling Distance (GSD) of 30 m, will cover the wavelength range from 400 nm to 2500 nm with 10 nm spectral sampling through two partially overlapped spectrometers. The panchromatic camera instead will acquire the same area with a spatial resolution of 5 m GSD. A Hyperspectral Image Simulator (HSIS) has been included in the PRISMA system. The main objective of HSIS is to allow the verification of the production chain before its integration in the Processing Subsystem, thanks to its capability of simulating all the relevant knowledge about the instrument, the orbit, the radiation source, the atmosphere and the observed scene. The Image Simulator takes in input either synthetic or real surface reflectance/radiance images compatible with PRISMA sensor characteristics and atmospheric, instrument and platform parameters to define the simulation scenario. The Instrument simulator implements in a modular and fully parametrized architecture all the functions relevant to the full path of conversion of the impinging photon flux to the Digital Numbers produced at instrument electronics output (L0 data). The modules comprise image projection and propagation through telescope to HYP (hyperspectral) and PAN (panchromatic) focal planes, with spatial optical effects (distortion, aberrations, smile/keystone, motion effect, etc.), spectral filtering (channels dispersion, SRFs) and full detection chain effects (background and dark signal, noise, non-uniformities, etc.). As output the HYP and PAN PRISMA L0 Products are generated and formatted in the CCSDS (Consultative Committee for Space Data Systems) format.
Guarini Rocchina, Loizzo Rosa, Longo Francesco, Mari Silvia, Varacalli Giancarlo Natale, Signorile Stefano, Magliozzi Maria Lucia, Avolio Corrado, Zavagli Massimo, Costantini Maria, Giunti Lorenzo, Fossati Enrico
Paper for Seminar/Symposium/Conference
SESP 2017 - ESA Workshop on Simulation and EGSE for Space Programmes (28-30 March 2017, Noordwijk c/o ESA-ESTEC,The Netherlands)
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