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Near infra red spectrograph zemax file3/28/2024 Oversampling is Resolution divided by spectral pixel sampling Spectral Resolution /Spectral Oversampling Main design and performance parameters of Sentinel-4 Spectral Table 1 below gives an overview of the Sentinel-4 instrument main design and performance requirements. Two identical Sentinel-4 instruments (PFM and FM-2) will be embarked, as Customer Furnished Item (CFI), fully verified, qualified and calibrated respectively onto two EUMETSAT satellites: Meteosat Third Generation-Sounder 1 & 2 (MTG-S1 and MTG-S2), whose Flight Acceptance Reviews are presently planned respectively in Q4 2021 and Q1 2030. Sentinel-4 will increase the frequency of cloud-free observations, which is necessary to assess troposphere variability. Furthermore, thanks to its 60-minutes repeat cycle measurements and high spatial resolution (8x8 km 2). In the family of already flown UVN spectrometers (SCIAMACHY, OMI, GOME & GOME 2) and of those spectrometers recently launched (TROPOMI) and currently under development (Sentinel-5), Sentinel 4 is unique in being the first geostationary UVN mission, together with very similar geostationary UVN missions over other continents, which are being developed in parallel by NASA (TEMPO) and KARI (GEMS). ![]() ![]() Right: photo of the instrument e-EM (without MLI) currently under testing. Left: artistic impression of Sentinel-4 embarked on Meteosat Third Generation-Sounder.
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