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Synthetic Aperture Radar(SAR)signal processing,since its very beginning in the early 50s,has raised Big Data challenges.These challenges stimulated a perpetual progress of solutions both in algorithmic and computational technology,ranging from optical processors and ultraspecialized computers to fast and very precise signal processing algorithms.Presently,SAR has achieved a high technological level and sensors are operating in a broad variety of coherent imaging modes with multi-temporal observations,etc.The use of SAR images has become ubiquitous and the application areas are continuously broadening.