岁差章动模型更新等因素对坐标转换的影响

发布时间：2018-10-22 17:15

【摘要】：GCRS(Geocentric Celestial Reference System,地心天球参考系)与ITRS(International Terrestrial Reference System,国际地球参考系)之间的坐标转换方法与岁差章动模型密切相关,IERS(International Earth Rotation and reference systems Service,国际地球自转与参考系服务)规范先后推荐了3组不同的岁差章动模型。论文分析了基于春分点的坐标转换过程,在比较3组岁差章动模型间差异的基础上,以太阳系10个天体为例,计算了岁差章动模型更新、极移、世界时与地球时差值等因素对坐标转换影响的具体数值。结果表明,IAU 2006岁差-IAU 2000AR06章动与IAU 2000岁差-IAU 2000A章动间的差异,对坐标转换的影响在0.5mas以内;而IAU1976岁差-IERS 1996章动与前2组岁差章动间的差异,对坐标转换影响的最大值达到37mas;极移对坐标转换影响的最大值达到0.6″,远高于岁差章动模型更新所带来的影响;当忽略世界时与地球时的差异时,结果完全错误。通过此分析,明确了极移、世界时与地球时的差异对坐标转换影响的具体数值,可为工程计算中岁差章动模型的选取提供参考依据。
[Abstract]:Coordinate transformation method between GCRS (Geocentric Celestial Reference System, geocentric celestial sphere reference system and ITRS (International Terrestrial Reference System, international earth reference system) and precession nutation model are closely related to, IERS (International Earth Rotation and reference systems Service, international earth rotation and reference system service) specification Three groups of precession nutation models were recommended. In this paper, the coordinate transformation process based on the Spring Equinox point is analyzed. On the basis of comparing the differences among three groups of precession nutation models, taking 10 celestial bodies in the solar system as an example, the precession nutation model updating and polar shift are calculated. The specific value of the effect of the difference between Universal time and Earth time on coordinate conversion. The results show that the difference between IAU 2006 precession-IAU 2000AR06 nutation and IAU 2000 precession-IAU 2000A nutation is within 0.5mas, while IAU1976 precession-IERS 1996 nutation is different from IAU 2000 precession nutation. The maximum value of the influence on coordinate conversion is 37 mass, and the maximum value of polar shift on coordinate transformation is 0.6 ", which is much higher than that of precession nutation model updating. When the difference between the world and the earth is ignored, the result is completely wrong. Through this analysis, the specific value of the influence of polar shift, world time and earth time on coordinate transformation is determined, which can provide a reference for selecting precession nutation model in engineering calculation.
【作者单位】：河南理工大学测绘与国土信息工程学院;中国科学院上海天文台;
【基金】：国家自然科学基金(No.41474021)
【分类号】：P126.5;P226.3

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