Analysis of correlation and total power radiometer front-ends using noise waves
A complete and systematic noise analysis of radiometer front-ends, including both total power and correlation measurements, is presented. The procedure uses the concepts of noise waves and S-parameters, widely used in microwave systems design and takes into account full noise characterization of rec...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2005 |
| 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:2117/2116 |
| Acceso en línea: | https://hdl.handle.net/2117/2116 |
| Access Level: | acceso abierto |
| Palabra clave: | Boundary layer (Meteorology) Microwave measurements Earth sciences Calibration Remote sensing S-parameters calibration microwave measurement remote sensing correlation measurement interferometric aperture synthesis radiometry microwave radiometry microwave systems design mismatch effects noise analysis noise characterization noise waves polarimetric radiometry radiometer calibration radiometer front-ends total power measurement Capa límit (Meteorologia) Microones -- Mesurament Ciències de la terra Calibratge Sensors remots Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció |
| Sumario: | A complete and systematic noise analysis of radiometer front-ends, including both total power and correlation measurements, is presented. The procedure uses the concepts of noise waves and S-parameters, widely used in microwave systems design and takes into account full noise characterization of receivers including mismatch effects. The general formulation is compatible with known total power radiometer analysis and is specially appropriate in correlation radiometers for which the effect of nonideal components, such as input isolators, is analyzed. Along with numerical simulations, simple formulas are given to compute the measured visibility in nonideal conditions. The analysis is validated using experimental results consisting of correlation measurements of four receivers placed inside an anechoic chamber. Good agreement between theoretical predictions and experimental data is observed. |
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