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测绘学报  2015 

一种改进的全球对流层天顶延迟模型

DOI: 10.11947/j.AGCS.2015.20140089, PP. 242-249

Keywords: 天顶对流层延迟,GZTD模型,时间分辨率,GZTD-6h模型

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Abstract:

顾及文献[16]所建立的全球对流层天顶延迟模型GZTD的时间分辨率为24h,为进一步提高GZTD模型的时间分辨率,利用GGOSatmosphere的2002—2009年全球天顶对流层延迟格网时间序列按照其6h的时间分辨率分别建模,再采用三次样条插值计算任意时刻的天顶对流层延迟估值,由此构建了一种时间分辨率更高(6h)的改进的GZTD模型(GZTD-6h).经过两种模型内符合检验对比分析表明,GZTD-6h模型内符合精度(bias0.17cm,RMS3.9cm)优于GZTD(bias0.17cm,RMS4.4cm).使用全球IGS站进行外符合检验,统计结果表明GZTD-6h模型(bias-0.22cm,RMS4.05cm)相比GZTD(bias-0.45cm,RMS4.51cm)改善明显.

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