| Summary: | 碩士 === 國立中央大學 === 太空科學研究所 === 92 === In this paper, the radiosonde data taken by Dong-Gang and Pan-Chiao rawinsonde station are analyzed to obtain tha statistic properties of atmosphere duct. It also shows the variation of duct's properties between south and north area in Taiwan during different month and season. Moreover, the N-Profile calculated from these radiosonde data are used to compare to CHAMP satellite data, and discuss the peoperties of N-Profile which obtained from GPS radio occultation techinique and can be analyzed to obtain the properties of atmosphere duct or not. Statistic results show that the N-Profile which obtained from GPS radio occultation techinique can not express the anomalous distribution of the surface atmospheric refractive index, and can not be analyzed to obtain the properties of atmosphere duct.
Besides, the radiosonde data taken in sea are used to certificate EREPS's evaporation model and the simulation of ray locus and coverage diagram, to analyze the accuracy of EREPS model. It shows that when air temperature larger than sea temperature, the EREPS model yields high evaporation duct heights, and when there is no evaporation duct exists, the simulation will be more correct.
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