Timothy Sands
Naval Postgraduate School, USA
Title: Secured SatCom - Command and control communications
Biography
Biography: Timothy Sands
Abstract
To Maintain secured communications signal connectivity, spacecraft must maintain orientation. Two objectives dominate consideration of control moment gyroscopes (CMGs) for maintenance of orientation: High torque (or equivalently momentum) and singularity-free operations. Utilizing a 3/4 CMG skewed-pyramid the optimal singularity-free configuration is revealed. Next, this presentation develops a decoupled control strategy to reduce the remaining singular conditions. Analysis and simulation is provided to justify the argument with experimental verification performed on a free-floating satellite simulator. Furthermore, a singularity penetration algorithm is developed, simulated, and experimentally proven to fly through singularities even without singularity reduction.