摘要
地心天球参考系(GCRS)与国际地球参考系(ITRS)之间有两种坐标转换模型:基于春分点的岁差章动转换和基于CIO的无旋转原点转换。IERS 2003和2010规范针对这两种转换模型分别推荐了相应的转换参数。以DE421历表中太阳系10个天体为例,计算并分析了两种坐标转换模型之间、以及两个规范之间的差异对于坐标转换的影响。结果表明:对于同一个规范而言,两种坐标转换模型之间的差异对坐标转换的影响在5μas以内;对于同一种坐标转换模型而言,两个规范之间的差异对坐标转换的影响在0.5 mas以内。
There were two kinds of transformation models between Geocentric Celestial Reference System（ GCRS）and International Terrestrial Reference System（ ITRS） ： the equinox-based precession-nutation transformation model and the CIO-based（ Celestial Intermediate Origin） non-rotating origin model. For these two models, IERS Conventions 2003 and 2010 recommended the corresponding transformation parameters respectively. Based on DE421, the effect of differences between the two models and that between the two conventions on coordinate transformation had been calculated and analyzed by taking the 10 celestial bodies in DE421 as examples. According to the results, as for the same convention, the effect of the differences between the two models on coordinate transformation didn t exceed 5 μas; as for the same transformation model, the effect of differences between the two conventions on coordinate transformation didn t exceed 0.5 mas.
出处
《测绘科学技术学报》
CSCD
北大核心
2016年第3期236-240,共5页
Journal of Geomatics Science and Technology
基金
国家自然科学基金项目(41474021)
国家测绘地理信息局测绘基础研究基金项目(15-01-05)
关键词
地心天球参考系
国际地球参考系
IERS规范
岁差章动模型
无旋转原点
时间系统
geocentric celestial reference system
international terrestrial reference system
IERS conventions
precession-nutation model
non-rotating origin
time system
