On the amount of information content in microwave radiometry for wet delay correction

The scope of this work is the determination of the set of optimum frequencies to be used in the companion microwave radiometers in future synthetic aperture radar altimeters, to provide higher spatial resolution of the atmospheric water vapor state to improve the wet delay correction in coastal regions. The channel selection is based on the study of the frequencies that provide the largest amount of information, as defined by the largest information entropy change from a prior knowledge state.