Abstract
Physical background of microwave remote sens-ing is introduced. Basic principles of microwave remote sensors (microwave radiometer, microwave scatterometer, microwave altimeter and microwave imaging radars) are reviewed. As for the microwave radiometer, the millimeter wave sounder is also introduced. In addition to the conventional scatterometer to measure wind vector, the precipitation radar is shown as an example of three dimensional scatterometer. As for the microwave imaging radar, both real aperture and synthetic aperture radar are shown. Especially, various types of synthetic aperture radars such as, interferometric SAR, polarimetric SAR, and scan SAR are introduced.
