| RESEARCH ON THE LOCAL CORRECTION MODEL OF ATMOSPHERIC DRY DELAY IN GPS REMOTE SENSING WATER VAPOR |
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| 作者姓名： | 谷晓平 王长耀 王 汶 蒋国华 |
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| 作者单位： | Guizhou Institute of Mountainous Environment and Climate，Guiyang 550002 China The State Key Laboratory of Remote Sensing Science，Institute of Remote Sensing Applications，CAS，Beijing 100101 China，Guizhou Institute of Mountainous Environment and Climate，Guiyang 550002 China，Guizhou Institute of Mountainous Environment and Climate，Guiyang 550002 China，Qingyuan Weather Station，Qingyuan 511518 China |
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| 基金项目： | Sino-Italian Cooperation Project “An Integrated System for the Planning, Monitoring and Real-time Forecasting of Floods Risks” |
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| 摘 要： | 1 INTRODUCTION As shown by much domestic and overseas study, the GPS technique can be used as a novel, efficient means in the measurement of water vapor. It increases the density of existing sounding sites both temporally and spatially and is useful in the remote sensing of regional and global content of water vapor1]. The principle with which the GPS works in water vapor remote sensing is as follows2]. While they are travelling to the receivers, GPS satellite signals are delayed in …
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| 关 键 词： | GPS 遥感观测 水位蒸发 大气干燥迟滞 局部关联模型 |
RESEARCH ON THE LOCAL CORRECTION MODEL OF ATMOSPHERIC DRY DELAY IN GPS REMOTE SENSING WATER VAPOR |
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| GU Xiao-ping,WANG Chang-yao,WANG Wen and JIANG Guo-hua.RESEARCH ON THE LOCAL CORRECTION MODEL OF ATMOSPHERIC DRY DELAY IN GPS REMOTE SENSING WATER VAPOR[J].Journal of Tropical Meteorology,2005,11(1):78-85. |
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| Authors: | GU Xiao-ping WANG Chang-yao WANG Wen and JIANG Guo-hua |
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| Institution: | Guizhou Institute of Mountainous Environment and Climate;The State Key
Laboratory of Remote Sensing Science, Institute of Remote Sensing Applications, CAS;Guizhou Institute of Mountainous Environment and Climate;Guizhou Institute of Mountainous Environment and Climate;Qingyuan Weather Station |
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| Abstract: | The precision of atmospheric dry delay model is closely correlated with the accuracy of GPS water vapor in the process of GPS (Global Position System) 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. |
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| Keywords: | GPS remote sensing water vapor atmospheric dry delay local correlation model |
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