Subjects: Astronomy submitted time 2024-07-03 Cooperative journals: 《天文学进展》
Abstract： Photo-Electic Telescope array has many advantages, such as wide field of view, numerous units, wide coverage of space domain, high reliability and strong real-time prop#2;erty, which plays an increasingly important role in space debris survey. The duration of the observation data (arc length) based on photo-electric telescope array is usually less than 1% of the orbital period for space debris, which brings many difficulties to orbit determination (OD) and orbit predication (OP) of space debris. First, in order to solve association of space debris based on photo-electric telescope array, this paper utilizes the TLE data and SGP4/SDP4 model, has achieved association matching of space debris observation data. Subsequently, in order to verify the application accuracy based on photoelectric array sys#2;tem data, a method for calculating the ballistic coefficient of space debris was studied, and the average ballistic coefficient of space debris was calculated using the orbit determination results of observation data. Finally, in order to verify the data accuracy, orbit determination accuracy, and ballistic coefficient calculation accuracy based on the photoelectric array system, a verification method using laser ranging data as the real accuracy was designed. The experimental results show that the success rate of space debris association matching reaches 91.19%, and the observation accuracy of mini electro-optical array can reach 7.65′′. The experimental results also show that the precise orbit determination and three-day predic#2;tion for laser ranging satellite SENTINEL6A and HY2C are implemented, and the position prediction accuracy is 319.11 m and 107.25 m, and the velocity prediction accuracy is 0.26 m/s and 0.09 m/s, respectively. The root mean square error of the one-day prediction for the new two line elements generated by the calculated ballistic coefficient of target 36508 is 746.84 m, which is 0.25% less than the root mean square error of the publicly available data of 748.68 m, and the accuracy of the two is similar.The above data indicates that the system basically meets the requirements of conventional tasks.
Subjects: Astronomy submitted time 2024-04-12 Cooperative journals: 《天文学报》
KANG Zhe
NIU Bing-li
LI Zhen-wei
SUN Jian-nan
LV You
ZHU Cheng-wei
DENG Shi-yu
LIU De-long
YANG Wen-bo
ZHANG Nan
LIU Ming
SUN Ming-guo
LIU Cheng-zhi
Abstract： Ground-based optical astronomical telescopes are one of the most important instruments for human exploration and research of the universe. Monitoring and analysis of the optical observation environment of the existing ground-based optical station can provide a reference for the targeted modification of equipment and the adjustment of observation strategies of observers, which is of great significance for improving the observation efficiency of ground-based optical equipment. Jilin Astronomical Observatory (hereinafter referred to as the ``Base'') is located about 5 kilometers (126.3$^{\circ}$ E, 43.8$^{\circ}$ N, 313 meters above sea level) in Nangou, Xiaosuihe Village, Dasuihe Town, Jilin City, Jilin Province, which is affiliated to the Changchun Observatory, National Astronomical Observatories, Chinese Academy of Sciences. The mean value of seeing of the base is about 1.3$''$--1.4$''$, the night sky brightness in the V band near the zenith is 20.64\;mag\,$\cdot$\,arcsec$^{-2}$, and the maximum number of clear nights is better than 270 days per year, which shows the good astronomical observation conditions. Jilin Astronomical Observatory, which was put into operation in 2016, has several photoelectric telescopes, including the 1.2-meter photoelectric telescope, the Mini Optoelectronic Telescope Array, the large field of view photoelectric telescope array, and the advanced multi-functional array-structured photoelectric detector. With the equipments mentioned above, we have carried out relevant research mainly on space target detection and recognition, precision orbit determination, new photoelectric detection methods and multicolor photometry of variables, and so forth. We have maintained a good cooperative relationship with a number of domestic universities and scientific research institutes.
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