数字天顶测量匹配星表的选取  

Selection of matching star catalogue in measurement based on digital zenith telescope

作　　者：陈少杰 高玉平[1,3] 时春霖 魏飞 尹东山 钟湘林[4] CHEN Shaojie;GAO Yuping;SHI Chunlin;WEI Fei;YIN Dongshan;ZHONG Xianglin(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Information Engineering University,Zhengzhou 450000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Troops 61206,Beijing 100042,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]信息工程大学,郑州450000 [3]中国科学院大学,北京100049 [4]61206部队,北京100042

出　　处：《导航定位学报》2023年第4期130-137,共8页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(11973046,41804034)。

摘　　要：为了进一步提升以数字天顶望远镜为代表的天文定位定向精度,提出一种数字天顶测量匹配星表的选取方法:指出研究不同星表系统之间的差异及其对天文测量的影响对提升数字照相天顶望远镜(DZT)的精度意义重大;并利用丽江站数字天顶望远镜测量数据,以盖亚(GAIA)DR2为基础研究第谷2号(Tycho-2)星表的位置误差及自行误差、视差、视向速度及星点密度对天文大地测量的影响。结果表明,相较于位置误差、自行误差、视差及视向速度等因素,GAIA DR2星点密度的增加对测量精度的提升更为显著,采用星点密度更高的GAIA DR2星表可以使得数字天顶测量的天文经纬度精度提升约20%。研究结果可为提高天文坐标测量、垂线偏差测量、世界时(universial time)UT1测量等的精度提供参考。In order to further improve the accuracy of astronomical positioning represented by digital zenith telescopes,the paper proposed a selection method of matching star catalogue in measurement based on digital zenith telescope:it was pointed out that it is of great significance to study the difference between different catalogue systems and their effects on astronomical measurements to improve the accuracy of digital photographic zenith telescope(DZT);moreover,based on GAIA DR2,the effects of position error,proper motion error,parallax,radial velocity and star density of Tycho-2 catalogue on astrometric results were studied by using the data of digital zenith telescope in Lijiang station.Results showed that compared with the errors of position and proper motion and the loss of parallax and radial velocity,the increase of star point density would have a more significant effect on the improvement of measurement accuracy,and using the GAIA DR2 catalog with higher star point density could improve the accuracy of astronomical longitude and latitude of digital zenith measurement by about 20%.The research results could provide a reference for improving the precision of astronomical coordinate measurement,vertical deviation measurement,universial time UT1 measurement,etc.

关 键 词：盖亚(GAIA)DR2星表 星表误差 天体测量 数字天顶测量 天文大地测量 

分 类 号：P228[天文地球—大地测量学与测量工程]