KEYWORDS: Control systems, Design, Control systems design, Interfaces, Telescopes, Databases, Process control, Data modeling, Network security, Information security
In the current context of the large-scale of astronomical equipment, the complexity of equipment structures, and the diversification of observation demands, the utilization of computers and networks to achieve autonomous control of astronomical telescopes becomes increasingly important. However, with the deep involvement of computer networks and software, as well as the increase in the overall complexity of system operation and maintenance, astronomical observation control systems are facing growing threats from malicious network attacks and unauthorized user operations. The Mozi Large Sky Survey Telescope, as the most powerful optical temporal survey device in the northern hemisphere, highlights the importance of access and permission management in its observation control system. This paper aims to introduce the use of token-based system access control, access permission management based on the RBAC model, and interface request rate limiting based on the leaky bucket algorithm to enhance the flexibility and security of identity authentication and permission management in observation control systems, effectively reducing the risks of unauthorized access, unauthorized operations by users, and network replay attacks.
The Wide Field Survey Telescope (WFST) is a new generation optical telescope under commissioning in China at the present stage. Designed with a Field of View (FOV) of three degrees and equipped with a 0.765 gigapixel mosaic CCD camera, the telescope will be used to survey the northern sky in multiple optical bands each night. To optimize the data, a diffuser screen system is designed to evaluate the inhomogeneity of the entire telescope system, which includes a diffuser screen, lighting module and system control module. The correction parameters from diffuser screen system will be very helpful to improve the accuracy of subsequent scientific data in data processing. For this purpose, the control module of the diffuser screen system is developed and some measurements are proposed. The correction methods and algorithms are achieved based on the operation of the diffuser screen and the corresponding screen data, which can make the system better used in observation of WFST.
WFST telescope is a large-aperture sky survey telescope jointly built by the University of Science and Technology of China and Purple Mountain Observatory. It is currently the most powerful optical time-domain sky survey telescope in the northern hemisphere. Its scientific goals are diverse, and the urgency and observation window period of different scientific tasks are different. During the observation period, the control of equipment requires accuracy, real-time, efficiency and safety. Therefore, we design and implement the OCS (Observatory Control System) of WFST which performs multi-layer abstraction on each hardware device and puts more attention on the operation of the observation process and the scheduling of observation tasks. In order to ensure the safety of equipment during the observation process, the OCS introduces a weather alarm system and fault diagnosis system. At the same time, we design an observation strategy system in the OCS to adjust the observation plan based on task priority, equipment information and meteorological information to maximize the efficiency of sky survey.
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