Abstract
The paper deals with the Attitude and Orbit Control Subsystem (AOCS) of the TV-SAT/TDF1 Spacecraft presently under development at Messerschmitt-Bölkow-Blohm Company. The design is based on the control concepts established and developed at MBB for the INTELSAT V Spacecraft, which was first launched in 1980, three flight units presently being in successful operation. Apart from the different attitude measurement equipment used, the main design changes of TV-SAT/TDF1 AOCS as compared to INTELSAT V are imposed by – three axis stabilization in transfer orbit and during apogee manoeuvre – digital control concept and – antenna fine pointing with RFS sensing in addition to body coarse control
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