Abstract
The wind scatterometer is a microwave active sensor capable of simultaneously measuring the normalized radar cross section (σo) of the sea surface with high radiometric accuracy at different azimuth angles. The scattering process governing the electromagnetic wave - sea surface interaction allows these measurements to be related to the sea surface wind field. Estimation of the wind field from σo measurements, however, requires significant processing. This paper is a comparative study of four objective functions within the framework of a new wind field retrieval procedure and shows that the retrieval procedures based on the classical L2 norm objective function, i.e., the Euclidean objective function, and the L2 norm objective function as modified by Stoffelen perform best.
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