On-board phase and modulus calibration of large aperture synthesis radiometers: study applied to miras.
On-board calibration of bidimensional aperture synthesis radiometers with a large number of antennas by the standard correlated noise injection method is technologically very critical because of the stringent requirements on mass, volume, and phase equalization of the noise distribution network. A n...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1996 |
| 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:2117/1976 |
| Acceso en línea: | https://hdl.handle.net/2117/1976 |
| Access Level: | acceso abierto |
| Palabra clave: | Radar Equipment and supplies Remote sensing applications Earth sciences Microwave measurements Boundary layer (Meteorology) calibration geophysical techniques microwave imaging radiometry remote sensing MIRAS bidimensional aperture synthesis radiometer geophysical measurement technique land surface large aperture synthesis radiometry microwave radiometry modulus calibration onboard phase calibration phase matching satellite remote sensing terrain mapping Radar Sensors remots Ciències de la terra Microones -- Mesurament Capa límit (Meteorologia) Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció |
| Sumario: | On-board calibration of bidimensional aperture synthesis radiometers with a large number of antennas by the standard correlated noise injection method is technologically very critical because of the stringent requirements on mass, volume, and phase equalization of the noise distribution network. A novel approach, which makes use of a set of uncorrelated noise sources uniformly distributed in the array, is proposed. Each noise source drives correlated noise only to a small set of adjacent antennas. These sets of antennas are overlapped in order to maintain phase and modulus track along the array. This approach reduces drastically mass and volume of the noise distribution network. Moreover, its phase matching requirement is strongly relaxed because it is only necessary within small sets of adjacent antennas. Power stability of the uncorrelated noise sources is also not a stringent requirement. This procedure allows independent phase and modulus calibration by making use of a reduced number of redundant correlations. |
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