| 顾及A公报影响的天文测量精度分析 |
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| 引用本文： | 陈少杰,高玉平,时春霖,尹东山,王平利,刘娜,秦炜.顾及A公报影响的天文测量精度分析[J].西南交通大学学报,2021,56(2):331-338. |
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| 作者姓名： | 陈少杰 高玉平 时春霖 尹东山 王平利 刘娜 秦炜 |
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| 基金项目： | 国家自然科学基金（11973046，41804034） |
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| 摘 要： | 地球定向参数是解算天文测量数据的重要参数，其精度直接影响最终的定位定向结果. 目前，没有一种技术手段可以实时获取高精度的EOP （earth orientation parameters）观测值，主要使用国际地球自转和参考系服务（International Earth Rotation and Reference Systems Service，IERS）发布的Bulletin A （简称A公报）预报值进行解算，但其对天文测量影响尚缺少系统的研究. 为此，研究了1998年—2018年每年1～365 d预报误差的长期变化情况及不同时间跨度的预报误差变化情况，并以某站数字天顶仪观测数据为例分析了预报误差对天文测量的影响. 分析结果表明:1年跨度的极移预报值对天文经度的影响小于0.03 as，纬度的影响小于0.09 as，天文方位角小于0.07 as，该指标远高于一等天文测量的精度要求；UT1?UTC （universal time1?universal time coordinated）的预报精度是限制A公报精度主要因素，其40 d以上的预报值无法满足一等天文测量的最低要求，预报精度仍有待于进一步提升.
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| 关 键 词： | 地球自转参数 大地天文测量 预报误差 极移 UT1?UTC |
| 收稿时间： | 2020-04-20 |
Analysis of Astrometry Accuracy Considering Effects of Bulletin A |
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| CHEN Shaojie,GAO Yuping,SHI Chunlin,YIN Dongshan,WANG Pingli,LIU Na,QIN Wei.Analysis of Astrometry Accuracy Considering Effects of Bulletin A[J].Journal of Southwest Jiaotong University,2021,56(2):331-338. |
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| Authors: | CHEN Shaojie GAO Yuping SHI Chunlin YIN Dongshan WANG Pingli LIU Na QIN Wei |
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| Abstract: | Earth orientation parameters (EOP) is of very importance to astronomical data calculation and its accuracy affects the final positioning and orientation. At present, there is no technical means to obtain high-precision EOP observation value in real time, which mainly relies on the Bulletin A forecast issued by the International Earth Rotation and Reference Systems Service (IERS). However, there is still lack of systematic research on how it affects astronomical measurement. To this end, the long-term variation of forecast error and the variation of forecast error for different time spans from 1 to 365 days are studied for a period of 1998—2018. Taking the observation data of a digital zenith telescope as an example, the influence of forecast error on astronomical measurement is analyzed. It shows that the influence of polar motion forecast for 365 days on astronomical longitude is less than 0.03 as, on latitude less than 0.09 as, and on astronomical azimuth less than 0.07 as, showing that it outperforms the precision requirement of first order astrometry. UT1?UTC (universal time1?universal time coordinated) forecast accuracy is the main factor limiting A bulletin accuracy. The forecast accuracy of the UT1?UTC is the main factor limiting the accuracy of the Bulletin A, and the error of its prediction over 40 days can not meet the minimum requirements of the first order astrometry, and the prediction accuracy of the UT1?UTC still needs to be further improved. |
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