I. Introduction
The increasing operational requirements for onboard autonomy in satellite control systems need Fault Detection and Isolation (FDI) methods providing fundamental information about the system health status, to allow subsequent accommodation actions to improve system reliability and availability, while maintaining desirable performances [1]. Several research efforts have been recently dedicated to develop active robust FDI methods for sensors and actuators of satellite Attitude Control Systems (ACSs) by mapping the satellite system into subsystems decoupled from disturbances [2], [3] and [4]. Most of these methods exploit the Nonlinear Geometric Approach (NLGA) to decouple the generated residuals from environmental disturbing inputs.