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Parameter uncertainty analysis in precise pointing control of flexible spacecraft

Széchenyi Plusz RRF

This article focuses on the validation of a classical PID controller scheme for flexible spacecraft with regards to the effect of parameter uncertainty on system stability and pointing precision. A high-fidelity simulation environment with external disturbances was built in Simulink using a control-oriented model of an Earth-observing satellite with a flexible appendage and on-board microvibration sources in orbit around the planet. Then, a PID control loop was designed with sensor dynamics, time delay behaviour, and a smooth trajectory generator. After declaring the natural frequencies, damping ratio, and rotation angle of the appendage, as well as the propellant tank mass to be uncertain, two worst-case scenarios were identified. Comparing the response of worst-case systems with nominal settings, only a minor drop has been found in the phase margins, with little to no difference in the pointing errors (smaller than ±2 arcsec for both roll and pitch).

Url
https://www.sciencedirect.com/science/article/pii/S2405896322012939?via%3Dihub=
Authors
Bezsilla, J.
Béla Takarics, PhD
Bálint Vanek, PhD
Guo, J.
Areas of application

Autonomous Aerial Vehicles

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Prof. Dr. Péter Gáspár

Hungary, H-1111 Budapest,
Kende u. 13-17.
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autonom@nemzetilabor.hu

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