Abstract
The JONSWAP spectrum sea surface is mainly determined by parameters such as the wind speed, the fetch length and the peak enhancement factor. In view of the study of electromagnetic scattering from JONSWAP spectrum sea surface, we need to determine the above parameters. In this paper, we use the double summation model to generate the multi-directional irregular rough JONSWAP sea surface and analyze the distribution concentration parameter and the peak enhancement factor’s influence on the rough sea surface model, then using physical optics method to analysis the JONSWAP spectrum sea surface’s average backward scattering coefficient change with the different distribution concentration parameters and the peak enhancement factors, the simulation results show that the peak enhancement factor influence on the ocean surface of the average backward scattering coefficient is less than 1 dB, but the distribution concentration parameter influence on the JONSWAP surface of the average backward scattering coefficient is more than 5 dB. Therefore, when we study the electromagnetic scattering of the JONSWAP spectral sea surface, the peak enhancement factor can be taken as the mean value but the distribution concentration parameter have to be determined by the wave growth state.
Highlights
With the in-depth study of sea clutter, the physical quantity of sea spectrum is used to describe the sea surface[1-3]
The sea-spectrum model can be derived from the equilibrium equation of ocean wave energy, or the autocorrelation function of the sea surface height can be calculated by using fixed-point observation sea surface or laboratory wave-making pool data, and obtained by Fourier transform
According to the mathematical model analysis of the first part of JONSWAP spectrum, When the wind speed and wind fetch length are determined, the JONSWAP sea surface is affected by the peak enhancement factor and the direction concentration parameter
Summary
With the in-depth study of sea clutter, the physical quantity of sea spectrum is used to describe the sea surface[1-3]. It is one of the most basic methods for describing the sea surface It reflects the statistical distribution of wave energy in the wavelength and propagation direction. It is the Fourier transform of the sea surface height fluctuation correlation function. The sea-spectrum model can be derived from the equilibrium equation of ocean wave energy, or the autocorrelation function of the sea surface height can be calculated by using fixed-point observation sea surface or laboratory wave-making pool data, and obtained by Fourier transform. According to the research needs, the multi-directional JONSWAP spectral ocean model is generated by the double stacking method, and the physical optical optics (PO) is used to simulate the sea surface backscattering coefficient under different peak enhancement factors or different direction concentration parameters. The conclusions of the selection of relevant sea spectrum parameters in the study of JONSWAP sea surface electromagnetic scattering are given
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