Optimum frequencies of passive microwave radiometer for tropospheric path-length correction

Details Optimum frequencies of passive microwave radiometer for tropospheric path-length correction Optimum frequencies of passive microwave radiometer for tropospheric path-length correction

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979itap...27..233w&link_type=abstract

IEEE Transactions on Antennas and Propagation, vol. AP-27, Mar. 1979, p. 233-239.

Astronomy and Astrophysics

Astronomy

9

Instrument Errors, Microwave Radiometers, Microwave Transmission, Tropospheric Waves, Water Vapor, Brightness Temperature, Calibrating, Computerized Simulation, Correction, Elevation Angle, Frequency Response, Optimization, Radio Astronomy, Weighting Functions

Scientific paper

Radio-astronomical observations require accurate calibration of tropospheric path length. Such calibration can be achieved by microwave radiometers operating near the 22-GHz water vapor line. However, the performances of current passive microwave radiometers are meteorology-profile dependent. This is due mainly to incorrect frequency combinations and to saturation of brightness temperatures. By properly selecting an optimum frequency pair and removing the saturation effect, the dependency is alleviated and can be further adjusted by surface measurements alone. Hence, a universal calibration equation is applicable to all environmental conditions. Optimum frequency pairs are systematically searched. Simulation analysis indicates that calibration for the tropospheric water-vapor path-length error is better than 0.3 cm at zenith and better than 2 cm for an elevation angle as low as 10 deg.

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