Radar Remote Sensing
The research field of SAR interferometry (InSAR) emerged since the launch of the ERS radar satellites by the European Space Agency (ESA) in 1990, and is still ongoing mainly supported by ENVISAT (ESA), TerraSAR-X/Tandem-X (DLR) satellites. Based on the computing and analyzes of the phase information of the radar signal that is a function of the distance between sensor and Earth’s surface and its back-scatter characteristic, it is possible to generate digital elevation models (DEM) with a very high accuracy. Due to the interferometric phase processing of two consecutive SAR observations and under ev. consideration of external topographic information (DEM), surface displacements between the two SAR acquisitions can be estimated. Depending on the quality and number of SAR data it became possible to estimate surface deformations in a sub-centimeter range.
SAR Interferometry: Introduction and Applications
Dr. Mahdi Motagh