A two-dimensional doppler-radiometer for earth observation
Compared to synthetic aperture radars (SARs), the angular resolution of microwave radiometers is quite poor. Traditionally, it has been limited by the physical size of the antenna. However, the angular resolution can be improved by means of aperture synthesis interferometric techniques. A narrow bea...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2001 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/2128 |
| Acceso en línea: | https://hdl.handle.net/2117/2128 |
| Access Level: | acceso abierto |
| Palabra clave: | Boundary layer (Meteorology) Geophysical instruments Radar Equipment and supplies Remote sensing Microwave measurements geophysical equipment geophysical techniques radiometers radiometry remote sensing terrain mapping 2D imaging L-band angular resolution aperture synthesis interferometry cross-correlation equipment geophysical measurement technique image formation instrument land surface microwave radiometer microwave radiometry narrow beam satellite remote sensing three-antenna Doppler-Radiometer two-dimensional Doppler-Radiometer Capa límit (Meteorologia) Geofísica -- Aparells i instruments Radar Sensors remots Microones -- Mesurament Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció |
| Sumario: | Compared to synthetic aperture radars (SARs), the angular resolution of microwave radiometers is quite poor. Traditionally, it has been limited by the physical size of the antenna. However, the angular resolution can be improved by means of aperture synthesis interferometric techniques. A narrow beam is synthesized during the image formation processing of the cross-correlations measured at zero-lag between pairs of signals collected by an array of antennas. The angular resolution is then determined by the maximum antenna spacing normalized to the wavelength (baseline). The next step in improving the angular resolution is the Doppler-Radiometer, somehow related to the super-synthesis radiometers and the Radiometer-SAR. This paper presents the concept of a three-antenna Doppler-Radiometer for 2D imaging. The performance of this instrument is evaluated in terms of angular/spatial resolution and radiometric sensitivity, and an L-band illustrative example is presented. |
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