Experimental Determination of Temperature Profiles by Ground-Based Radiometry.
Research and development technical rept.,
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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A one-week experiment was conducted to evaluate microwave and infrared radiometers for recovering low altitude temperature profiles. The radiometers were a two-channel microwave, operating at 53.5 and 54.5 GHz, and a four-channel infrared, operating near 15 micrometers. Meteorological support included radiosondes, helicopters, and an instrumented 500-foot tower. Statistical inversion of 13 radiometer angular scan data resulted in an average rms error of 2.0 K up to 10,000 feet for the microwave system. Significant features of thermal inversion structure were recovered. Difficulties in obtaining agreement between calculated and measured radiances precluded the retrieval of profiles from the infrared data. A continuous set of fixed-angle brightness observations correlated well with temperatures measured on the tower. The statistical inversion method and the Backus-Gilbert method were applied to the analysis of the accuracy and the spatial resolution of the ground-based system. Author