Mr. Ruhollah Sadeghi-Amin Profile

Ruhollah Sadeghi-Amin

at Iranian National Observatory

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Proceedings Article | 30 August 2022 Paper

INO340 Telescope end-to-end simulations and performance analysis

Asghar Jafarzadeh, Ruhollah Sadeghi-Amin, Lorenzo Zago, Reza Ravanmehr, Habib Khosroshahi, Mohammadreza Rostamian

Proceedings Volume 12187, 121870U (2022) https://doi.org/10.1117/12.2628850

KEYWORDS: Telescopes, Device simulation, Computer programming, Control systems, MATLAB, Observatories, Head, Laser range finders, Image quality, Turbulence

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The Iranian National Observatory Telescope is a 3.4-meter Alt/Az optical telescope. MCS (Mount Control System) is developed in such a way that meets the requirements of movements control of all axis. To this end, the end-to-end (E2E) simulations are performed using Matlab software. In this simulation, the telescope is modeled with adequate precision, and the mechanical behavior of the model is tested. Then the results were confirmed with other software independently in some specific positions to make sure that the mechanical behavior is precise and valid. Then in the Matlab software, a controller is developed, and the simulated telescope is controlled. Tracking error is calculated with the presence of the simulated wind at the predicted speeds, and the performance of the MCS is then analyzed and the controller is improved. The tracking accuracy at different speeds is calculated and compared. The final controllers are tuned in Matlab, and errors and noises are applied in the simulation environment. A simple optical instrument is also simulated to estimate the image quality in the image plane. Then, after development of the structure of the telescope, in the integration phase, the appropriate controller is implemented in the real controller, and the real results are recorded from the telescope. During integration, a test camera is placed in the telescope to check the primary image quality and compare the results with the encoder's recorded data. In this paper, we discuss the design and development approach for axis controllers and provide the related results together with the future upgrades necessary for enhancing telescope performance.

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