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Publication Citation: Proximity effects in the calibration of microwave radiometers

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Author(s): Ronald C. Wittmann; Amanda Cox; Randy Direen;
Title: Proximity effects in the calibration of microwave radiometers
Published: October 01, 2005
Abstract: Microwave, total-power radiometers are calibrated by observing sources of known brightness temperature. Free-space calibrations are usually performed assuming far-field interactions, although the actual calibration source may be well into the near-field region of the radiometer antenna. Here, we simulate the free-space coupling between radiometer and calibration target to explore the potential contribution of proximity effects to measurement uncertainty.
Conference: Antenna Measurement Techniques Association
Proceedings: Proc., Antenna Meas. Tech. Asoc. Symp.
Pages: pp. 333 - 336
Location: Newport, RI
Dates: October 30-November 4, 2005
Keywords: calibration;microwave;near-field gain;radiometer;remote sensing;uncertainty analysis
Research Areas: Electromagnetics