Radars are today used for various purposes – from maritime surveillance radars, analyzing earthsurface, collecting geological data, predicting weather conditions based on data collected from various meteorological radars, detecting various size vehicles and/or objects in the air or at the ground or even in the ground or sea (mobile or not moving) to the pure military purposes. There are also many challenges still to be completely solved when sensing earth, oceans, atmosphere and space with radar systems and processing and interpreting collected data.