Research On Control System Of Near-Infrared Sky Brightness Monitor And Some Technologies Of Data Processing Of Fast

The progress of astronomy and the development of astronomical telescope are closely related.Human beings try their best to explore the mysteries of the universe through various ways,such as visible telescope,infrared telescope,ultraviolet telescope and radio band telescope,hand-held telescope,great telescope and space telescope.For the ground-based infrared astronomical telescope,the measurement of infrared sky brightness is directly related to the exposure time,signal-to-noise ratio and other indicators.It is also of great significance for the selection of station site.In addition,infrared detection,infrared guidance and infrared camouflage also rely on the measurement of infrared sky brightness.Since the signal of infrared sky brightness is very weak,and the measurement is significantly affected by the environmental interference signal,the lack of independent research and development of the infrared sky brightness measurement system has been a long time in China.The near-infrared sky brightness monitor,based on InSb detector and measuring 2.5?5 ?m infrared sky brightness,was designed to meet the actual needs of the domestic observatory represented by Ali Observatory in Tibet.In this paper,the control system of the monitor is analyzed,including thermal simulation,evaluation of cooling capacity,electronic system and main control program.The overall performance of the control system is verified through test and performance analysis.Because the data generation of radio astronomical telescope is far beyond that of other telescope,higher request for automatic processing of radio astronomical data is set.Since Five-hundred-meter Aperture Spherical Telescope(FAST)is the largest single aperture radio telescope in the world,the data processing of the extragalactic HI line observation of FAST is complicated.There are obvious differences in the data processing process due to the changes of the observation mode,receiver,calibration method and other parameters,which also increase the difficulty of automatic data processing.Automatic data preprocessing program was designed to meet the needs of FAST in this paper.In the program,the original data was obtained from the back-end of the receiver,after that a series of processes such as data cutting,flow calibration,correction,radio frequency interference flagging,coordinate conversion was executed.By adjusting the configuration parameters,data preprocessing can be realized under different initial conditions.In this paper,the main work is as follows:1.Design of control system of 2.5um?5um band near-infrared sky brightness monitor based on InSb detector.The refrigeration structure of the monitor was predicted and adjusted according to the thermal simulation results.The algorithm of the main control program was designed and realized.2.Data preprocessing program for extragalactic HI line observation of FAST was realized.According to the scientific principles and methods of the key steps in the data processing,high-speed and effective processing algorithm was designed.