Development of the digital servo system for enhanced pointing accuracy of the 32m Gavril Grueff VLBI antenna in Medicina

Le résumé fourni par la source

High frequency observations rely critically on the stability and accuracy of a radiotelescope pointing mechanism. To establish operational autonomy and achieve higher technical performance, we initiated the independent development of a new servo system for the 32m Grueff Antenna. Our study prioritized an empirical characterization of the telescope’s dynamics. We developed a custom drive interface allowing for high-fidelity in-situ testing. Experimental data acquired through this process highlighted critical design requirements for the system upgrade. Results demonstrate that a robust active anti-backlash torque sharing strategy is paramount to mitigate mechanical play. Furthermore, the analysis confirmed that optimal tracking precision requires strict load-to-motor inertia matching and the adoption of ultra-low cogging motors to minimize velocity ripples. Finally, the observed non-linear behaviors dictate the implementation of adaptive control architectures, such as gain scheduling.

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