Large Optical Antarctic Telescope, LOAT hereafter, is a new research hotspot nowadays. For example, a 2.5m KDUST, e.g. Kunlun Dark UniverSe Telescope is on anvil. It's difficult for main axis of large telescope tracking system to track the target precisely with ultra-low speed because of nonlinear disturbances due to unique ultra-low temperature. This paper presents these nonlinear disturbances.
Shihai Yang, Shihai Yang,
"Nonlinear disturbance to Large Optical Antarctic Telescope", Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84445G (17 September 2012); doi: 10.1117/12.925296; https://doi.org/10.1117/12.925296