Introduction
Why Tefnut?
- Meteorology: high spatio-temporal tropospheric parameters estimated at GNSS receivers, such as tropospheric path delays in zenith or slant directions, tropospheric horizontal gradients or derived indicators, are valuable for improvement of numerical weather forecasts and nowcasts
- Climate: accurate long-term GNSS troposphere estimates are valuable for independent validation of climate models, water vapour cycle etc
- Positioning: tropospheric corrections are provided from a local augmentation service for fast ambiguity resolution using PPP-RTK
- G-Nut/Tefnut is a tool for advanced monitoring of the troposphere through analysing ground-based GNSS observations when supported with precise GNSS products.
Purposes
- Post-processing long-term troposphere monitoring (climate research)
- Near real-time troposphere estimates (meteorology)
- Real-time troposphere estimates (meteorology, PPP-RTK)
- Stochastic modelling with a high temporal parameter resolution
- Estimating zenith path delays and tropospheric horizontal gradients
- Estimating slant tropospheric delays retrieved from carrier-phase post-fit residuals and trophospheric parameters
- Troposphere state indicators (severe weather events)