Recent progress on rotational time shared scanning synthetic aperture imaging radiometer

Up to the present, most earth observation applications of synthetic aperture imaging radiometers (SAIR) are air-born and low earth orbit (LEO) space-born, where snap shot system with high imaging frame rate is necessary. With the increasing demands of microwave Geostationary Earth Orbit (GEO) earth observation for weather forecast, non snap shot type of imaging technology can be considered. While an image can be taken within a certain period of time, the hardware complexity can be dramatically reduced by scanning the sampling system during this period of time. In this paper, two kinds of rotational time shared scan scheme are analyzed, which are single rotation scan and double rotation scan. The recent progress on polarimetric correction methods developed for the two rotation schemes are present.