南山26米射电望远镜轨道高差测量及其对指向精度的影响
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摘要
轮轨式天线的轨道作为承载整个天线重量的基础,其精度直接影响天线在方位方向运转的平稳性,引起天线轴系偏差从而影响天线的指向精度。介绍改造后的乌鲁木齐南山26 m射电望远镜(Nanshan Radio Telescope, NSRT)轨道结构以及轨道高差测量,并建立天线在不同方位、俯仰角下轨道高差引起天线指向偏差的数学模型。利用"十字扫描"法实测多颗标准源在相应位置的指向数据,并通过高斯拟合得到指向偏差。通过分析可知,轨道高差引起的指向偏差经过修正可以提高天线的指向精度。
The track of wheel on track antenna is the important foundation which carries the whole antenna weight; its precision directly influences the operation of the antenna in azimuth direction stability, causing the shafting error and finally influences the antenna pointing accuracy. This paper introduces the reconstructed Nanshan Radio Telescope(NSRT) 26 m antenna track structure and track unevenness measurement, and establishes the mathematical model of antenna pointing error caused by the track unevenness of the antenna under different azimuth and elevation angle. The cross scanning method is used to measure the pointing data of multiple standard radio sources in corresponding positions, and the pointing error is obtained through Gauss fitting method. Through analysis, we can see that the pointing error caused by track unevenness is corrected, and the antenna pointing accuracy can be improved.
The track of wheel on track antenna is the important foundation which carries the whole antenna weight; its precision directly influences the operation of the antenna in azimuth direction stability, causing the shafting error and finally influences the antenna pointing accuracy. This paper introduces the reconstructed Nanshan Radio Telescope(NSRT) 26 m antenna track structure and track unevenness measurement, and establishes the mathematical model of antenna pointing error caused by the track unevenness of the antenna under different azimuth and elevation angle. The cross scanning method is used to measure the pointing data of multiple standard radio sources in corresponding positions, and the pointing error is obtained through Gauss fitting method. Through analysis, we can see that the pointing error caused by track unevenness is corrected, and the antenna pointing accuracy can be improved.
引文
[1] SYMMES A, ANDERSON R, EGAN D. Improving the service life of the 100-meter green bank telescope azimuth track[C]// Proceedings of SPIE. 2008.
[2] 付丽, 凌权宝, 赵融冰, 等. TM 65 m天线基础和轨道沉降及对天线指向的影响[J]. 红外与激光工程, 2016, 45(11): 190-196.
[3] 王娜. 新疆奇台110米射电望远镜[J]. 中国科学: 物理学力学天文学, 2014, 44(8): 783-794.
[4] 李永江, 艾力·玉苏甫, 张正禄, 等. 天线轨道变形精密测量与指向偏差模型研究[J]. 武汉大学学报 (信息科学版), 2013, 38(2): 176-180.
[5] 刘璇, 艾力·玉苏甫, 项斌斌, 等. 轨道不平度对天线指向的影响分析与修正[J]. 天文学报, 2017, 58(4): 47-57.
[6] 姜正阳, 孔德庆, 张洪波, 等. 考虑轨道不平度的射电望远镜指向修正方法[J]. 天文研究与技术, 2015, 12(4): 417-423.
[7] TONINO P, FRANCO B, SERGIO P, et al. The SRT inclinometer for monitoring the rail and the thermal gradient effects on the alidade structure[C]// Proceedings of SPIE. 2014, 9145: 72-78.
[8] GAWRONSKI W. Modeling and control of antennas and telescopes[M]. New York: Springer, 2008: 211-222.
[9] 吴江. 110米高精度全可动反射面天线轨道不平度及其对指向精度的影响[D]. 西安: 西安电子科技大学, 2016.
[10] GAWRONSKI W, BAHER F, QUINTERO O. Azimuth-track-level compensation to reduce blind-pointing errors of the beam-waveguide antennas[R]. The Telecommunications and Mission Operations Progress Report, 1999, 139: 1-18.
[11] 王惠, 宁云炜, 闫浩. 26米天线座架温度分布规律及变形影响分析[J]. 天文研究与技术, 2018, 15(2): 208-215.
[2] 付丽, 凌权宝, 赵融冰, 等. TM 65 m天线基础和轨道沉降及对天线指向的影响[J]. 红外与激光工程, 2016, 45(11): 190-196.
[3] 王娜. 新疆奇台110米射电望远镜[J]. 中国科学: 物理学力学天文学, 2014, 44(8): 783-794.
[4] 李永江, 艾力·玉苏甫, 张正禄, 等. 天线轨道变形精密测量与指向偏差模型研究[J]. 武汉大学学报 (信息科学版), 2013, 38(2): 176-180.
[5] 刘璇, 艾力·玉苏甫, 项斌斌, 等. 轨道不平度对天线指向的影响分析与修正[J]. 天文学报, 2017, 58(4): 47-57.
[6] 姜正阳, 孔德庆, 张洪波, 等. 考虑轨道不平度的射电望远镜指向修正方法[J]. 天文研究与技术, 2015, 12(4): 417-423.
[7] TONINO P, FRANCO B, SERGIO P, et al. The SRT inclinometer for monitoring the rail and the thermal gradient effects on the alidade structure[C]// Proceedings of SPIE. 2014, 9145: 72-78.
[8] GAWRONSKI W. Modeling and control of antennas and telescopes[M]. New York: Springer, 2008: 211-222.
[9] 吴江. 110米高精度全可动反射面天线轨道不平度及其对指向精度的影响[D]. 西安: 西安电子科技大学, 2016.
[10] GAWRONSKI W, BAHER F, QUINTERO O. Azimuth-track-level compensation to reduce blind-pointing errors of the beam-waveguide antennas[R]. The Telecommunications and Mission Operations Progress Report, 1999, 139: 1-18.
[11] 王惠, 宁云炜, 闫浩. 26米天线座架温度分布规律及变形影响分析[J]. 天文研究与技术, 2018, 15(2): 208-215.