Strengthening Environmental Monitoring System with Microwave Satellite Signals: Promotion of Integrated Radio Occulted (Data Application of Ro Mission Formosat-3 and Formosat-7) and Ground-Based Approach(3/3)

Project Details


The atmosphere is a complex environment; highly variable, transformed by human activity, indispensable, a key research subject and everyday life interest, observed with ground- and space-based sensors both in-situ and remotely. Reliable monitoring and predicting of this highly challenging environment needs accurate and frequent observations of the most important (at least for severe weather, precipitation and cloudiness) troposphere constituent - a water vapour. Therefore meteorological community started to investigate other, not primarily weather related observations such as GNSS signals.The GNSS signal is within the spectral band of microwave radiation and as such is sensitive to the conditions of troposphere in a function of temperature, pressure and water vapour. The signal emitted from the space-borne platforms and received on the low earth orbiting satellites or on the ground is bended and delayed by atmosphere induced effects. In standard positioning applications these parameters are estimated and removed as a noise. However, for forecasters and weather modellers this is an invaluable data source of conditions and dynamics of troposphere.As the number of GNSS satellites is growing, amount and strength of the transmitting frequencies is increasing, size of a ground-based GNSS receivers networks is extending and polar orbiting satellites with GNSS receivers on board are more frequently launched; the time resolution, spatial resolution, sensitivity of GNSS based remote sensing is greatly improving. This project aims to harness this global trend to extend the use of GNSS observations in environmental monitoring to improve modelling of severe weather phenomena in different climatic zones using expertise of both Partners.In this project we will: 1) Apply effective ray-tracing technique (for both ground- and space- based platforms), supporting precise estimation of troposphere impact on GNSS signal; 2) Improve numerical weather prediction models assimilation systems to include GNSS derived information; 3) Use ground-based (GNSS), space-based (RO) observations for monitoring and forecasting severe weather; 4) Establish joint ground-based and space-based GNSS data processing center for troposphere monitoring.The integrated space-based and ground-based observing system provides optimal combination of time resolution, spatial resolution and accuracy of troposphere conditions. The CSRSR and GPSARC, both are located in the Taiwan’s National Central University (NCU), expertise in RO and numerical weather prediction and GNSS&Meteo long-standing experience with ground-based observations and troposphere modelling provides synergistic benefits.
Effective start/end date1/05/1831/12/19

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 11 - Sustainable Cities and Communities
  • SDG 12 - Responsible Consumption and Production
  • SDG 17 - Partnerships for the Goals


  • radio occultation
  • high-impact weather
  • meteorological satellite data assimilation


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