Abstract
One of the systematic error sources in GNSS positioning is the tropospheric delay. The EGNOS augmentation system uses a specific model for taking this effect into account. This model is evaluated in the GNSS precise point positioning technique. Moreover it is compared to other tropospheric models, including the well-known Hopfield and Niell models, as well as a regression model based on Hungarian radiosonde observations. A part of the Hungarian active GNSS network is used for the test, and two study periods have been chosen for the investigations. One of them was a stormy summer period, when the status of the troposphere changes rapidly, while the other one was a calm winter period, when the troposphere contains a low amount of water vapor.
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