ROUGH-SURFACE SCATTERING RESULTS BASED ON BANDPASS AUTOCORRELATION FORMS

被引:7
作者
MILLER, LS [1 ]
PARSONS, CL [1 ]
机构
[1] NASA,GODDARD SPACE FLIGHT CTR,WALLOPS FLIGHT FACIL,WALLOPS ISL,VA 23337
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 1990年 / 28卷 / 06期
关键词
D O I
10.1109/36.62626
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
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. This investigation examines the consequences of autocorrelation forms which correspond to spectral processes that are essentially bandpass in nature. One such process is that of ocean wind waves; that is, 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. This analysis indicates that “Gaussian correlation length” or mean-square slope is not an appropriate parameter for narrow-band 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. © 1990, IEEE.
引用
收藏
页码:1017 / 1021
页数:5
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