Remote sensing acquires and interprets small or large-scale data about the Earth from a distance. Using a wide range of spatial, spectral, temporal, and radiometric scales remote sensing is a large and diverse field for which this Handbook will be the key research reference. Illustrated throughout, an essential resource for the analysis of remotely sensed data, The SAGE Handbook of Remote Sensing provides researchers with a definitive statement of the core concepts and methodologies in the discipline.
Chapter 13: Active and Passive Microwave Systems1
Active and Passive Microwave Systems1
Imaging radar (SAR), Synthetic Aperture radar (SAR), polarimetry, interferometry, InSAR, PolInSAR, DInSAR, altimeters, scatterometers, radiometers.
Microwave Sensors Overview
Remote sensors operating in the microwave region of the electromagnetic (EM) spectrum can be grouped into two basic categories: (1) Sensors that transmit microwaves and measure the energy of the returned signal, and (2) sensors that measure energy from microwaves emitted from observed targets. The former systems are referred to as active, the latter as passive microwave sensors. Active sensors are based on radio detection and ranging (RADAR2) technology and can be distinguished into imaging radars, altimeters, and scatterometers (Elachi 1988). Passive sensors work conceptually similarly to optical thermal sensors and are generally referred to as radiometers or microwave scanners.