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ITRS与GCRS的转换方法对比分析

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地心天球参考系(geocentric celestial reference sys‑tem,GCRS)和国际地球参考系(international terrestrial refer‑ence system,ITRS)之间的坐标转换对天体动力学研究具有重要意义.目前实现坐标转换的两种方法分别为基于春分点的经典方法和基于天球中间原点(celestial intermediate or‑igin,CIO)的无旋转原点方法,IERS(International Earth Ro‑tation and Reference Systems Service)规范先后推荐了不同的岁差章动模型用于转换.以国际GNSS服务提供的精密星历数据为例,通过对比ITRS和GCRS坐标转换前后三轴坐标序列的差异,计算并分析了两种坐标转换方法之间的差异,同时还分析了两个岁差章动模型和地球定向参数对坐标转换的影响.结果表明,基于春分点和基于CIO的方法一致性较好,IAU2000与IAU2006/2000A两种岁差章动模型间的差异对卫星坐标转换的影响在1 cm以内,极移、天极偏差、时间系统的使用也会影响转换精度.
Comparative Analysis of the Conversion Methods Between ITRS and GCRS
The coordinate transformation between geocentric celestial reference system (GCRS) and the international ter-restrial reference system (ITRS) is very important for many applications in astrodynamics. Two coordinate transformation models are the classical method based on vernal equinox point and the non-rotation origin method based on celestial interme-diate origin (CIO). Taking the precise ephemeris data provid-ed by international GNSS service (IGS) as an example,this paper compares the differences of three-axis coordinate se-quences after coordinate transformation,the differences be-tween the two coordinate transformation methods,the preces-sion and nutation models,and the influence of the Earth Ori-entation Parameters on the coordinate transformation are cal-culated and analyzed. The results show that there is good con-sistency between the equinox-based and CIO-based methods,and the difference between IAU2000 and IAU2006/2000A precession nutation model is less than 1 cm;polar shift,celes-tial deviation and the use of time system will also affect the conversion accuracy.

international terrestrial reference system (ITRS)geocentric celestial reference system (GCRS)coordinate transformationearth orientation parameters

魏二虎、阳心怡、张云龙、谷洪业、李岩林、刘经南

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武汉大学测绘学院,湖北武汉,430079

武汉大学资源与环境科学学院,湖北武汉,430079

中国铁路设计集团有限公司,天津,300251

武汉大学卫星导航定位技术研究中心,湖北武汉,430079

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国际地球参考系 地心天球参考系 坐标转换 地球定向参数

国家重点研发计划国家自然科学基金天津市轨道交通导航定位及时空大数据技术重点实验室开放基金

2018YFC150360042374015TKL2024B04

2024

10.14188/j.2095-6045.2022425

测绘地理信息
武汉大学

测绘地理信息

CSTPCD
影响因子：0.563
ISSN：1007-3817
年,卷(期)：2024.49(4)