NASA NTRS · 19770015890
Digital controller design: Continuous and discrete describing function analysis of the IPS system
Abstract
The dynamic equations and the mathematical model of the continuous-data IPS control system are developed. The IPS model considered included one flexible body mode and was hardmounted to the Orbiter/Pallet. The model contains equations describing a torque feed-forward loop (using accelerometers as inputs) which will aid in reducing the pointing errors caused by Orbiter disturbances.
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1977-04-01. Digital controller design: Continuous and discrete describing function analysis of the IPS system. https://ntrs.nasa.gov/citations/19770015890
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