| Astronomy is a science that studies the structure and evolution of celestial bodies and the universe,and the development for it cannot be achieved without the astronomical observations.The scientific studies of astronomy are rely on the observational data obtained by astronomical observations.The output results of these studies are affected by the quality of the observational data directly.The invention of telescope,the invention and application of photographic film and CCD chips,the construction of large telescopes and precision observational instruments,are all trying to improve the quality of astronomical observation and to obtain observational data with better quality.The diameter of the telescope is increasing continues,and the performance of the observational instruments is also improved continues,which result in more and more targets that can be observed.The observational time of the telescope become more and more valuable,too.How to schedule the observational resources,such as telescope,observational instruments and the targets to be observed more effectively through the observatory control system,and then make full use of the limited observational time of the telescope to obtain more observational data with better quality,has become an urgent problem need to be studied now.Lijiang 2.4-meter telescope,the largest general-purpose optical telescope in China,has been applied to the worldwide astronomers since 2008.It has become one of the most important astronomical observation and research platforms in China.In this paper,the key technologies such as intelligent control of telescope control system,unified control of instruments based on information fusion technology,data flow of observational data processing and responding of the observatory control system has been studied based on the Lijiang 2.4-meter telescope.After that,these technologies were applied into the studying and developing procedure of the observatory control system for Lijiang 2.4-meter telescope.All the works that have been completed are summarized as follows:1)Study on the basic frame structure of observatory control system for Lijiang 2.4-meter telescope.Based on the study on the observatory control system of telescopes at home and abroad,formed the basic frame structure of the observatory control system for Lijiang 2.4-meter telescope.The function of each part of this system was also analyzed in details.Then,all the relevant works need to be completed in order to construct the observatory control system for Lijiang 2.4-meter telescope are described.2)Study on the integration of telescope control system.On the premise that there has no source code of the telescope control system for Lijiang 2.4-meter telescope,the telescope network communication interface(TNT in short)was upgraded completely,and the status database of this telescope was reconstructed,too.Based on the sequencer control pattern,the control command set of the telescope control system was redeveloped.A set of sequencer control command was developed for this telescope,and then was applied into the autonomous photometric observation task.Through the works completed,a basis for realizing the unified control and scheduling of the telescope control system by the observatory control system has been achieved.3)Study and implement of the instrument control system.Based on the study of the major instruments and their control system of Lijiang 2.4-meter telescope,we proposed an instrument control system suitable for this telescope under the sequencer control pattern.After that,the control system of two instruments was developed by using the idea of sequencer control used by YFOSC,which is PI CCD and HiRES respectively.Thus,the unified control and dispatching of these three major observation instruments by observatory control system is realized.In addition,in order to realize the unified management of observation data,we defined three standards for the instrument control system while producing the observational data.They are the uniform standard of observation data file name,the uniform standard of telescope information in FITS header information and the standard of WCS information in FITS header.All of these standards have been utilized in the instrument control system,which will be controlled by the observatory control system.4)Study and implement of the data management system.The framework of the data management system with seven modules,including storage,backup,preview,inspection,preprocessing,archiving and release of the data,has been established for the Lijiang 2.4-m telescope.According to the different geographical distribution,the data management system is divided into the on-site system and the off-site system to responsible for different work.A complete process of observational data archiving is also established.The off-site backup of observational data is realized through the transport across different networks.In addition,an online preview and inspection system for the observational data,as well as an offline inspection system,has been established to conduct timely inspection of observational data in order to provide feedback to observatory control system.5)System integration and unified scheduling.Based on the analysis of the key factors related to observation scheduling,a series of observation and scheduling auxiliary systems have been developed,which provides a good basis for the integration of several subsystems with the observatory control system.Based on this,a complete observation scheduling model is established for the follow-up observation of gravitational wave events,which can respond to gravitational wave events in as soon as possible.Several works related to the observatory control system of Lijiang 2.4-meter telescope have been completed,such as the telescope control system,the instrument control system and data management system.All of the works finished have been applied during the astronomical observation.In the future,we will continue to complete the unfinished work,and improve the observation efficiency of the Lijiang 2.4-meter telescope finally. |
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