Physics – Optics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990itgrs..28.1017m&link_type=abstract
IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892), vol. 28, Nov. 1990, p. 1017-1021.
Physics
Optics
4
Autocorrelation, Microwave Scattering, Physical Optics, Surface Roughness Effects, Backscattering, Mean Square Values
Scientific paper
Surface-height autocorrelation forms such as Gaussian and exponential are often used in studies of near-normal incidence rough-surface scattering. Such models require the existence of a constant, or DC, value in the spectrum. The consequences of autocorrelation forms that correspond to spectral processes that are essentially bandpass in nature are examined. One such process is that of ocean wind waves. In this case, the spectral components do not extend down to zero frequency. The physical optics backscatter theory is reexamined relative to such autocorrelation functions. Experimental results obtained from a wavetank are compared to the autocorrelation model used in the analysis. The analysis indicates that Gaussian correlation length or mean-square slope is not an appropriate parameter for narrowband conditions and that significant slope is a more relevant parameter. Inherent in the deep-phase assumption is some form of slope dependency. The analysis given (and variants thereof) can be used to provide insight into the physical effects of separate spectral components and of spectral directionality.
Miller Lee S.
Parsons Chester L.
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