On the nonlinear mapping of an ocean wave spectrum into a synthetic aperture radar image spectrum and its inversion

1991 ◽  
Vol 96 (C6) ◽  
pp. 10713 ◽  
Author(s):  
Klaus Hasselmann ◽  
Susanne Hasselmann
Keyword(s):  
Synthetic Aperture Radar ◽  
Wave Spectrum ◽  
Synthetic Aperture Radar Image ◽  
Ocean Wave ◽  
Radar Image ◽  
Synthetic Aperture ◽  
Nonlinear Mapping ◽  
Ocean Wave Spectrum ◽  
Aperture Radar

On the Nonlinear Mapping of an Ocean Wave Spectrum into a New Polarimetric SAR Image Spectrum

2020 ◽  
Vol 50 (11) ◽  
pp. 3109-3122
Author(s):  
Yanmin Zhang ◽  
Yunhua Wang ◽  
Qiaohui Xu
Keyword(s):  
Synthetic Aperture Radar ◽  
Wave Spectrum ◽  
Ocean Wave ◽  
Synthetic Aperture ◽  
Nonlinear Mapping ◽  
Sar Image ◽  
Polarimetric Sar ◽  
Ocean Wave Spectrum ◽  
Sea Wave ◽  
Aperture Radar

AbstractA new nonlinear transformation relation is derived to describe the mapping of a two-dimensional ocean wave spectrum into a new polarimetric synthetic aperture radar (SAR) image spectrum. It is a further expansion and improvement of Hasselmann’s work. First, the nonlinear mapping relation proposed is derived on the basis of a new polarimetric SAR image instead of the conventional single-polarization SAR image. Second, the nonlinear mapping relation no longer includes the complex hydrodynamic modulation transfer function (MTF). Third, the traditional tilt MTF, which is not accurate enough for the retrieval of sea wave spectrum, is replaced by an empirical tilt MTF derived on the basis of the C-band geophysical model function [i.e., C-band synthetic aperture radar (CSAR) normalized radar cross section (NRCS) model]. A sea wave spectrum retrieval algorithm is then proposed that is based on the new nonlinear mapping and the empirical tilt MTF. The retrieved spectra from C-band polarized RADARSAT-2 SAR images are compared with the results obtained by the ECMWF Ocean Wave Model (ECWAM) and buoy measurements.

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