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科学通报  2014 

高阶电离层延迟对GPS坐标时间序列的影响分析

DOI: 10.1360/972012-1785, PP. 913-923

Keywords: 高阶电离层延迟,GAMIT/GLOBK,全球GPS数据重新处理,加权均方根分析,频谱分析

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Abstract:

基于高阶电离层延迟改正模型,确定了不同阶次电离层延迟对双频GPS载波信号的影响量,并根据国际地球自转与参考系统服务(internationalearthrotationandreferencesystemsservice,IERS)协议2010推荐的最新模型,对全球均匀分布的109个国际GNSS服务(internationalGNSSservice,IGS)跟踪站1999~2003年的全球定位系统(globalpositioningsystem,GPS)数据重新进行了精密处理,量化了高阶电离层延迟对全球GPS坐标时间序列的贡献.研究结果表明,高阶电离层延迟改正会造成较大的测站速度变化,在赤道附近的测站垂直速度变化最大可达约1mma-1;能显著降低赤道附近测站垂直分量及亚洲南部测站南北分量的加权均方根(weightedrootmeansquare,WRMS),最佳改善效果达10%(中国LHAS站南北分量);可有效减小IGS基准站各种不同周期信号的振幅;据此,提出高阶电离层延迟可能是造成中纬测站垂直周年、东西方向半周年及低纬测站垂直半周年运动的主要原因之一.

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