The IASI technical expertise center : IASI tuning a nd performance monitoring

CNES is involved in many earth observation missions. In particular, it plays a key role in the performance monitoring and tuning of in-flight payloads. In that respect, so-called “technical expertise centers” are set up to analyze the status of each instrument under CNES responsibility and, if necessary, to generate new c onfiguration either for in-flight payload or ground segment. This consists in an appropriate pool of technical and human resources dedicated to a particular instrument. The generic a rchitecture of an “expertise center” will be presented in the context of IASI system. The IAS I expertise center will be described in details with particular emphasis on its complexity and diversity. Indeed, together with a software aimed to monitor IASI performances and to generate IASI configurations, IASI expertise center includes the IASI level 1 ground s egment as well as a numerical model of the instrument. Finally, the main outcomes of the IASI expertise will be presented : the IASI performances, after almost three years in orbit, wi ll be reviewed.