Synthetic Aperture Radar

Synthetic-aperture radar (SAR) is a type of radar that uses the motion of a moving platform, such as an aircraft or spacecraft, to create high-resolution images of objects. SAR uses the Doppler effect to create a synthetic antenna aperture that is much larger than the physical antenna, allowing for high-resolution imaging. SAR has a wide range of applications, including remote sensing, mapping, and monitoring of the Earth's surface, as well as detection of natural disasters and military surveillance.learn more on wikipedia