Thermal Analysis and Control Design for Space Optical Telescope ROKITS

Space optical telescopes experience extreme hot and cold temperature conditions in the space environment depending on their orbit conditions. This temperature variation has a significant impact on the deformation of the structure body and mounts of space telescopes, which in turn leads to the degradation of the optical performance. Therefore, thermal analysis and control design are a prerequisite for the development of space optical telescopes to maintain the operating and survival temperature limits of all components during their mission phases. The performance of space optical telescopes necessitates the establishment of a thermally stable and reliable system, a goal that can be achieved through on-orbit thermal analysis. In this paper, we present passive and active thermal control design implemented for the Republic Of Korea Imaging Test System based on thermal analysis. This analysis is rooted in on-orbit thermal considerations taking into account the worst hot and cold conditions in the space environment. The thermal analysis was conducted utilizing the Thermal Desktop, SINDA/FLUINT program.