To help understanding the radiative transfer in the atmosphere at these high millimeter wave frequencies, the UK Meteorological Office and the Laboratoire de Météorologie Dynamique (France) have jointly developed a microwave receiver at 89 and 157 GHz, frequencies corresponding to the AMSU-B window channels. The sounder has been flown in two international experiments in 1990. In this paper, we will focus on the gaseous absorption problem.
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C. Prigent, "Airborne radiometric observations at 89 and 157 GHz: comparison with gaseous absorption models.," Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15760L (1 October 1991);