Emmy-Noether-Project "Bridging Geodesy and Seismology"

SAR

SAR, for Synthetic Aperture Radar, refers to a radar technique were a moving radar antenna, e.g. mounted on a satellite orbiting the Earth, is sending radar pulses and receives reflections of these pulses.

With a fast moving sensor and a high frequency of pulses we can image the reflectors on the ground with a high spatial resolution, so the sensor acts as if equipped with a very large antenna.

Sentinel-1: seeing through cloudsCopyright: ESA/ATG medialab


 

The reflected radar signal has an intensity, which carries information on the surface backscatter properties, e.g. surface roughness, and we measure the signal phase, which carries information on the travel path length.

In SAR interferometry we compare the phase signal of repeated acquisitions to infer changes on the ground, e.g. surface movements.

Earthquake monitoring with radar satellites;

Copyright: ESA/DLR (animation data: Copernicus data 2014/ESA Insarap study/NORUT/COMET/University of Leeds)



For more videos visit the ESA webpage http://www.esa.int/spaceinvideos/Videos and search “Sentinel-1”

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SRCMOD Database