What are the problems affecting SAR systems?
SAR sensors, like all radar sensors, are subject to geometric limitations due to the side looking nature of the illumination. Characteristics affecting most severely radar images are: shadows, foreshortening, variation in pixel resolution over the image, layover, speckle. Shadows are areas on the image which give a weak return to the recorder because they face away from the radar signal emitter. Shadows increase at the extremes of the image because of the wider look angle.
