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Instrument: SASS : SEASAT-A Scatterometer System
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A scatterometer provides the backscatter cross-section as a function of
incidence angle for the area under observation. In the case of the SASS, the
main interest was in measuring the ocean surface backscatter as a means to
derive the surface wind vector. The physical basis for this technique is that
the strength of the radar backscatter is proportional to the amplitude of the
surface capillary waves (Bragg scattering), which in turn is related the wind
speed near the surface. Moreover, the radar backscatter is anisotropic,
allowing the wind direction to be derived from backscatter measurements at
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