From 1993 to 1995 I was involved as a consultant to Alenia in the "Attitude and Orbit Control System" (AOCS) of the SAX satellite.
SAX was ... an ESA scientific (astronomical) satellite : "X-Ray". Fokker (FSS) did ... for Alenia.
Of course I promoted the use of my dual control law in this satellite, but the main issue in SAX was ...
Attitude reconstruction with missing sensors ... Kalman filter ... tuning. Sensor fusion.
PDF ' s :
SAX Kalman filter tuning no-gyro mode, 1995