Calabrese, D.D.CalabreseNicito, A.A.NicitoViscio, M.A.M.A.ViscioRicci, C.C.RicciDe Luca, Giuseppe FrancescoGiuseppe FrancescoDe LucaFasano, LucaLucaFasanoNirchio, FrancescoFrancescoNirchio2021-04-302021-04-302018https://hdl.handle.net/20.500.13025/5909COSMO-SkyMed is an Earth Observation space program funded by the Italian Ministry of Research and Italian Ministry of Defence (I-MoD) and conducted by the Italian Space Agency (ASI) in conjunction with I-MoD. COSMO-SkyMed (CSK) consists of a constellation of four Low Earth Orbit mid-sized satellites, each carrying a multi-mode, high resolution, electronically steerable Synthetic Aperture Radar (SAR) instrument operating at X-band and a full featured Ground Segment to properly exploit space capabilities. In the framework of the current programmatic phase concerning the operational management of the constellation, a set of qualified teams was introduced in order to perform technical, operational and engineering activities on the system. Tailored information flows were developed among ASI, It-MoD and Industrial staff in order to continuously guarantee the performances and the availability of the system and to identify potential enhancements and changes for the optimization of the overall cost/benefit ratio and the increase of the performances with respect to the original specification. Thanks to such an organization, many improvements have been identified and implemented. Amongst them, this paper illustrates new operational procedures in order to extend the full operational performance also in case of failure of the gyroscope. After a detailed study, where all the actions required to the Integrated Control System to cope with a multiple failure of gyro channels, has been carried out the new mode transition logic and rate estimation algorithm have been implemented in the COSMO-SkyMed AOCS. The paper’s aim is to describe how the estimation strategy has been validated and to show the analysis of the flight telemetries and their coherence with the analysis. © 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.conference paper10.2514/6.2018-2307https://arc.aiaa.org/doi/10.2514/6.2018-2307