An improved model for the dielectric constant of sea water at microwave frequencies |
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Authors: | Klein L Swift C |
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Institution: | George Washington Univ. as a Research Associate at NASA Langley Research Center, Hampton, VA, USA; |
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Abstract: | The advent of precision microwave radiometry has placed a stringent requirement on the accuracy with which the dielectric constant of sea water must be known. To this end, measurements of the dielectric constant have been conducted atS-band andL-band with a quoted uncertainty of tenths of a percent. These and earlier results are critically examined, and expressions are developed which will yield computations of brightness temperature having an error of no more than 0.3 K for an undisturbed sea at frequencies lower thanX-band. At the higher microwave and millimeter wave frequencies, the accuracy is in question because of uncertainties in the relaxation time and the dielectric constant at infinite frequency. |
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