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| GPS水汽遥感中的大气干延迟局地订正模型研究 |
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谷晓平1,2,3, 王长耀1, 王汶1
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1.中国科学院遥感应用研究所, 北京, 100101;2.中国农业大学, 北京, 100094;3.贵州省气象中心, 贵阳, 550002
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| 摘要: |
| 在GPS遥感水汽过程中,大气干延迟模型的精度直接影响水汽遥感的精度。根据广东清远站1995～2001年的气象探空资料,计算了GPS水汽测量中的实际大气干延迟。在此资料基础上,利用地面气象要素建立了大气干延迟的年和分月局地订正模型。分析结果表明,年模型的精度优于目前广泛使用的普适模型;月模型与年模型相比,效果不是很明显,建立局地分月订正模型意义不大;在对高度角的敏感程度上,局地模型略大些;当高度角小于75°时,大气干延迟弯曲路径与直线路径之差ΔS随天顶角增大而迅速增大。 |
| 关键词: GPS水汽遥感 大气干延迟 订正模型 |
| DOI： |
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| 基金项目:中意合作项目“洪水风险规划、监测和实时预报的集成系统”资助 |
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| RESEARCH ON THE LOCAL CORRECTION MODEL OF ATMOSPHERIC DRY DELAY IN GPS REMOTE SENSING WATER VAPOR |
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GU Xiao-ping1,2,3, WANG Chang-yao1, WANG Wen1
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1.Institute of Remote Sensing Apllication, CAS, Beijing 100101, China;2.China Agricultural University, Beijing 100094, China;3.Guizhou Meteorological Center, Guiyang 550002, China
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| Abstract: |
| The precision of atmospheric dry delay model is closely correlative with GPS water vapor's accuracy in the process of GPS remote sensing. Radiosonde data (from 1996 to 2001) at Qingyuan are used to calculate the exact values of the atmospheric dry delay. Base on these calculations and the surface meteorological parameters, the local year and month correction models of dry delay at the zenith angle of 0 are established by statistical methods. The analysis result shows that the local model works better and is slight more sensitive to altitude angle than universal models and that it is not necessary to build models for each month due to the slight difference between year model and month model. Furthermore, when the altitude angle is less than 75°, the difference between curve path and straight path increases rapidly with altitude angle's decrease. |
| Key words: GPS remote sensing water vapor atmosphere dry delay local correction model |