Model-based optimal tracking control architecture for ground-based telescopes

Giacomo Basile; Manuel Gonzalez; Alberto Petrillo; Stefania Santini; Salvatore Savarese; Pietro Schipani

doi:10.1117/12.3020102

11 September 2024 Model-based optimal tracking control architecture for ground-based telescopes

Giacomo Basile, Manuel Gonzalez, Alberto Petrillo, Stefania Santini, Salvatore Savarese, Pietro Schipani

Author Affiliations +

Proceedings Volume 13094, Ground-based and Airborne Telescopes X; 130943L (2024) https://doi.org/10.1117/12.3020102
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

This paper focuses on the designing of tracking control strategies for ground-based telescopes by also comparing model-based solutions with more classical alternatives. Within this framework, we synthesize a double-layer control architecture consisting of: i) a position control layer, which combines a Kalman filter observer and Linear-Quadratic-Gaussian-Proportional-Integral (LQG-PI) controller to compute the appropriate speed profile guaranteeing a reliable tracking of a given telescope position trajectories; ii) a speed control layer, which ensures the optimal tracking of the computed speed profile by driving the torque of the telescope. Moreover, a trapezoidal speed pre-processor is embedded in our control architecture with the aim of computing the appropriate telescope axes position trajectories: this ensures that all the telescope physical constraints, in terms of speed and acceleration, are not always violated. Virtual simulations, carried out via an ad-hoc simulation platform, implemented in Matalb&Simulink and tailored for the specific case study Telescopio Nazionale Galileo (TNG) located at La Palma island, disclose the effectiveness of the hierarchical control architecture for a representative set of star trajectories. Validation phase also considers several realistic conditions and takes into account input disturbance such as the Von-Karman wind disturbance model. Finally, a comparison analysis with a PID-based control architecture is provided to discuss about the advantages and benefits of the proposed optimal control solution.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Giacomo Basile, Manuel Gonzalez, Alberto Petrillo, Stefania Santini, Salvatore Savarese, and Pietro Schipani "Model-based optimal tracking control architecture for ground-based telescopes", Proc. SPIE 13094, Ground-based and Airborne Telescopes X, 130943L (11 September 2024); https://doi.org/10.1117/12.3020102

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