Abstract
(Possibilities and Limitations of Microwave Systems for Satellite Remote Sensing)—Microwaves are applied in satellite remote sensing in both active, i.e. radar systems and in passive, i.e. microwave radiometer systems. The advantages and disadvantages of active and passive microwave systems in comparison to each other and to optical systems are discussed shortly. It becomes evident that radar has advantages over microwave radiometry due to its ranging and velocity-measurement capability, due to its SAR-capability with its extremely fine resolution and due to the fact that no major theoretical limitations exist for the obtainable measurement accuracy. The most important radar systems for Earth and ocean observations from satellites are altimeter, scatterometer and imaging radars with real or synthetic aperture. The physical and technical basics of these types of radar are presented together with some applications. Examples for remote sensing data and results obtained from different microwave remote sensing systems show the present state of the art and the present possibilities and limitations of microwave systems for satellite remote sensing.
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