Tropospheric refractivity profiling based on single ground-based GPS

Based upon the zenith delay and slant-path delay of single ground-based GPS receivers, the retrieving methods are developed to obtain atmospheric refractivity profiles, which include the statistical method based on zenith wet delay, the method based on refractivity profile model, and the neural network method based on slant-path delay. Using historical radiosonde data by these methods, the atmospheric refractivity profiles are retrieved by simulating, which show that the methods in this paper can obtain better results than the general meteorological models.