IASI NG instrument performance status

Developed by Airbus Defense and Space under CNES overall responsibility in partnership with Eumetsat, the Infrared Atmospheric Sounding Interferometer New Generation (IASI-NG) is a key payload element of the second generation of European meteorological polar-orbit satellites (METOP-SG). It will continue and improve the IASI mission in the next decades (2020-2040) in the field of operational meteorology, climate monitoring, and characterization of atmospheric composition related to climate, atmospheric chemistry and environment. The main challenge is the performance improvement by a factor two compared to IASI with regard to spectral resolution and radiometric error. The measurement technique is based on wide field Fourier Transform Spectrometer (operating in the 3.5 - 15.5 μm spectral range) with an innovative Mertz compensated interferometer to manage the so-called self-apodisation effect and the associated spectral resolution degradation. End 2019, IASI-NG instrument Critical Design Review has been successful and since nearly all the sub-units of the PFM instrument have been fully characterized and delivered to ADS. Interferometer principle has been partially validated on a Bread Board Model and Interferometer EQM and PFM have completed qualification and performance test. The aim of this paper is first to present the performance budget of the instrument after CDR, based on sub-units consolidation (sub-unit CDR) or measurement (sub-assemblies PFM measurement). We will then focus on the overall instrument development status and the different upcoming milestones until the delivery.