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Séminaire général du Département TAO

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Satellite Radar Interferometry for geophysics and meteorology
Ramon Hanssen (Delft Institute of Earth Observation and Space Systems)

5 avril 2005

Satellite synthetic aperture radar (SAR) images form the basis of an increasingly broad spectrum of applications, mainly because of their operability independent of weather conditions. In interferometric radar applications, the main emphasis is on the coherent phase observations of two or more images, which can be used to map, e.g., surface deformation and topography. In contrast to the statement above, for the phase measurements the weather independency does not hold anymore. In fact, the atmospheric refractivity distribution in time and space results in a significant distortion of the phase observations.
In this presentation, we will focus on these effects from two perspectives. First, we will discuss how radar interferometry can be used for deformation monitoring, what is the influence of the atmospheric signal, and how this effect can be beaten. This approach leads to mm-level deformation measurements related to e.g. land subsidence and tectonics. Second, we investigate how we can exploit the atmospheric disturbance signal for meteorological inferences, leading to full-column water vapor mapping with unprecedented accuracy and spatial resolution. The presentation will be concluded with an outlook of new scientific possibilities for both geophysics and meteorology related to the new radar satellite missions currently developed.

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Ramon Hanssen Ramon Hanssen (Delft Institute of Earth Observation and Space Systems)
Professor, Section Head MGP. Delft University of Technology.