测站数目及分布对地球自转参数解算精度的影响The effect of station numbers and distribution balance on earth rotation parameters with GPS observation
张永浩,成英燕,邢云剑,王虎,姚向东,曹炳强
摘要(Abstract):
为研究GPS数据解算地球自转参数(ERP)精度受测站数目及分布均衡性影响规律的问题,该文利用全球国际GNSS服务(IGS)站提供的GPS数据,设置不同测站数、不同测站分布均衡程度的解算策略,通过对比不同策略下ERP解算精度,来研究测站数目和均衡程度对ERP解算过程中的影响规律。结果表明,考虑到解算效率的情况下,测站数目选择40个时能达到最佳效果,此时极移在x方向的RMS值为0.223 081 mas,在y方向的RMS值为0.186 941 mas;对于测站分布均衡性,该文提出用观测网的网重心坐标转换为大地坐标作为评价指标,当网重心越接近地心,解算精度越高。研究成果表明在利用GPS数据解算ERP参数时,选择适当数目的测站以及分布均衡性好的解算策略可以提高解算效率及精度。
关键词(KeyWords): 地球自转参数;测站数目;测站分布均衡性;观测网重心
基金项目(Foundation): 国家重点研发计划项目(2016YFB0501405);; 中国测绘科学研究院基本科研业务费项目(7771707);; 国家自然科学基金面上项目(41874042)
作者(Author): 张永浩,成英燕,邢云剑,王虎,姚向东,曹炳强
DOI: 10.16251/j.cnki.1009-2307.2020.04.005
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