RESEARCH ON THE LOCAL CORRECTION MODEL OF ATMOSPHERIC DRY DELAY IN GPS REMOTE SENSING WATER VAPOR |
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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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