Method for estimating sea surface scattering coefficient of space-based high-frequency radar

Abstract

The invention provides a method for estimating a sea surface scattering coefficient of a space-based high-frequency radar. The method comprises the following steps that a Fourier series of linear andnon-linear sea surface wave heights is constructed, a relation model between linear and non-linear wave height coefficients is further constructed through a perturbation method, and a relation model between a directed sea wave spectrum and a linear wave height coefficients is established; an incident field electric field intensity is constructed, the incident field electric field intensity is combined to construct components of a sea surface near scattering field electric field in an X-axis direction and a Z-axis direction through the perturbation method according to the Fourier series, and avertical polarization field intensity component model of a sea surface far scattering field magnetic field is further constructed; and a time autocorrelation model of a vertical polarization field intensity component of the sea surface far scattering field magnetic field is constructed, and Fourier transform is used to further construct a sea surface scattering coefficient model. Estimation of thesea surface scattering coefficient provides a reliable basis for parameter design of the space-based high-frequency radar for ocean remote sensing, and is also a theoretical basis for inversion workof ocean echo signals of the space-based high-frequency radar.

Description

technical field [0001] The invention belongs to the field of high-frequency radar ocean remote sensing, and in particular relates to an estimation method of space-based high-frequency radar sea surface scattering coefficient. Background technique [0002] Because the wavelength of high-frequency / ultra-high-frequency electromagnetic waves is close to that of gravity waves in the ocean, the ocean echoes of high-frequency / ultra-high-frequency ocean radars contain rich ocean information. At present, many countries in the world use shore-based high-frequency radars to obtain current, wind and wave field information on the ocean surface. The longest detection distance of these radars is 250km, and the time resolution ranges from 10 minutes to 1 hour. The spatial resolution varies from 300m to 5km. Shore-based high-frequency radar provides a large amount of data for near-shore ocean observation, which meets the needs of near-shore ocean surface observation to a certain extent. ...

AI Technical Summary

Problems solved by technology

However, there are not many theoretical studies on ocean remote sensing with space-based high-frequency radar, and there is relatively little hardware design experience, so how to design and manufacture space-based high-frequency radar still needs further research

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