Proximity effects in the calibration of microwave radiometers
Ronald C. Wittmann, Amanda Cox, Randy Direen
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.
Proc., Antenna Meas. Tech. Asoc. Symp.
October 30-November 4, 2005
Newport, RI, USA
Antenna Measurement Techniques Association
calibration, microwave, near-field gain, radiometer, remote sensing, uncertainty analysis