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Synthetic Aperture Radar (SAR)
RaDAR (RAdio Detection And Ranging) is a general active system in the MW region of the spectrum for the detection and measurement of features of the objects. For its characteristics, it can operate even in nighttime and with clouds coverage. Moreover, the information retrieved is different and complementary to that from systems in optical regions of the spectrum (materials can absorb and reflect energy in different proportions as the radiation wavelength varies).
Among Radar systems, the Synthetic Aperture Radar (SAR) is an imaging side-looking Radar system that exploits the Doppler shift from the craft relative velocity for improving spatial resolution (around 3 meters for modern Very-High Resolution SAR Systems, as Cosmo Sky-Med or TerraSAR X). Moreover, SAR backscattering can also take account of the polarization feature of both transmitted and received signals. The information retrieved by SAR data can be exploited in many applications, as change detection, modelling of environmental parameters or automatic classifications.