Effect of non-Gaussian properties of the sea surface on the low-incidence radar backscatter and its inversion in terms of wave spectra by an ocean wave spectrometer

Ping Chen; Qiaohua Yin; Ping Huang

doi:10.1007/s00343-015-4191-x

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Effect of non-Gaussian properties of the sea surface on the low-incidence radar backscatter and its inversion in terms of wave spectra by an ocean wave spectrometer

Updated：2023-05-16

- Effect of non-Gaussian properties of the sea surface on the low-incidence radar backscatter and its inversion in terms of wave spectra by an ocean wave spectrometer
- Journal of Oceanology and Limnology Vol. 33, Issue 5, Pages: 1142-1156(2015)
- Affiliations：
  
  1. Science and Technology on Multi-spectral Information Processing Laboratory
  2. School of Electronic Information and Communications Huazhong University of Science and Technology
- Author bio：
- Funds：
- DOI：10.1007/s00343-015-4191-x
  CLC：
- Online First：08 September 2015，
  
  Published：2015
- Accepted：
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Chen, P., Yin, Q. & Huang, P. Effect of non-Gaussian properties of the sea surface on the low-incidence radar backscatter and its inversion in terms of wave spectra by an ocean wave spectrometer., Chin. J. Ocean. Limnol. 33, 1142–1156 (2015). https://doi.org/10.1007/s00343-015-4191-x
DOI：

Chen, P., Yin, Q. & Huang, P. Effect of non-Gaussian properties of the sea surface on the low-incidence radar backscatter and its inversion in terms of wave spectra by an ocean wave spectrometer., Chin. J. Ocean. Limnol. 33, 1142–1156 (2015). https://doi.org/10.1007/s00343-015-4191-x DOI：

摘要

Abstract

The principle of ocean wave spectrometers was first presented several decades ago to detect the directional wave spectrum with real-aperture radar (Jackson

1981). To invert wave spectra using an ocean wave spectrometer

for simplicity

the hydrodynamic forcing and wave-wave interaction effect are neglected and a Gaussian slope probability density function (pdf) is used to calculate the normalized backscattering cross-section (σ 0) of the ocean surface. However

the real sea surface is non-Gaussian. It is not known whether the non-Gaussian property of the sea surface will affect the performance of the inversion of the wave spectrum if following existing inversion steps and methods. In this paper

the pdf of the sea surface slope is expressed as a Gram-Charlier fourth-order expansion

which is quasi-Gaussian. The modulation transfer function (MTF) is derived for a non-Gaussian slope pdf. The effects of non-Gaussian properties of the sea surface slope on the inversion process and result are then studied in a simulation of the SWIM (Surface Waves Investigation and Monitoring) instrument configuration to be used on the CFOSAT (China-France Oceanography Satellite) mission. The simulation results show that the mean trend of σ 0 depends on the sea slope pdf

and the peakedness and skewness coefficients of the slope pdf affect the shape of the mean trend of σ 0 versus incidence and azimuth; owing to high resolution of σ 0 in the range direction

MTF obtained using the mean trend of σ 0 is almost as accurate as that set in the direct simulation; in the inversion

if ignoring the non-Gaussian assumption

the inversion performances for the wave spectrum decrease

as seen for an increase in the energy error of the inverted wave slope spectrum. However

the peak wavelength and wave direction are the same for inversions that consider and ignore the non-Gaussian property.

关键词

Keywords

references

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