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Method for resolving sea level stormy wave spectrum by means of full-polarized SAR echo data

An echo data, fully polarized technology, applied in the direction of using re-radiation, reflection/re-radiation of radio waves, radio wave measurement systems, etc., can solve problems such as high frequency wind and waves that cannot be resolved nonlinear

Inactive Publication Date: 2017-03-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

This method firstly decomposes the polarization of the scattering unit on the sea surface, and then analyzes the image spectrum of the echo component contributed by the pure Bragg scattering, which solves the problem that the traditional wave spectrum inversion algorithm cannot resolve the nonlinear high-frequency wind and sea waves.

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  • Method for resolving sea level stormy wave spectrum by means of full-polarized SAR echo data
  • Method for resolving sea level stormy wave spectrum by means of full-polarized SAR echo data
  • Method for resolving sea level stormy wave spectrum by means of full-polarized SAR echo data

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Embodiment Construction

[0013] The present invention will be described in further detail below in conjunction with the accompanying drawings of the specification. With reference to the drawings, the specific implementation of the present invention is divided into the following steps:

[0014] (1) Polarization decomposition of fully polarized SAR sea echo data. The sea surface echo signal of SAR can be simulated as the vector sum of Bragg scattered echo and non-Bragg scattered echo, namely

[0015]

[0016] Among them, the echoes from each scattering element are superimposed by vectors, and then belong to the Bragg scattering contribution component and the non-Bragg scattering contribution component respectively.

[0017] (2) Analysis of spectral characteristics of Bragg scattering contribution. For the Bragg scattering contribution S obtained by polarization decomposition b Make a cross-image spectrum, which corresponds to high-frequency wind and ocean waves with frequencies outside the cut-off frequency....

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Abstract

The invention provides a method for resolving a sea level stormy wave spectrum by means of full-polarized SAR echo data. The method is based on decomposition of a sea level scattering mechanism of polarized SAR measured data. The method comprises the steps of performing polarization decomposition on the full-polarized SAR echo data; according to a coherent polarization decomposition theory and a sea level scattering theory, by means of a Bragg scattering theory model, separating simple Bragg scattering contribution from the full-polarized SAR echo data; and using the echo component which is concentrated by Bragg scattering into calculation of an image cross spectrum, thereby analyzing a directional spectrum of sea level stormy wave frequency band which corresponds with Bragg scattering except for a stormy wave cut-off frequency. The method for resolving the sea level stormy wave spectrum by means of the full-polarized SAR echo data is characterized by comprising the technical processes of (1), a polarization decomposition method of full-polarized SAR sea level echo data; and (2), a spectrum characteristic analysis method of Bragg scattering contribution.

Description

Technical field [0001] The invention relates to the use of polarization scattering characteristics to analyze the high frequency wind wave spectrum of the sea surface in the field of Polarization Interferometric SAR (PolInSAR) data processing, that is, a method for analyzing the sea surface wind wave spectrum using fully polarized SAR echo data, which can analyze the submerged in low frequency High-frequency wind wave direction spectrum in background ocean waves. Background technique [0002] Polarized interferometric SAR is a synthetic aperture radar (SAR) that transmits and receives two (horizontal H and vertical V) polarized electromagnetic waves at the same time, and obtains four polarization combinations (HH / VV / HV / VH) in a coherent time. The SAR echo signal can capture the different polarization characteristics of different scattering elements on the earth's surface. In the sea water background fluctuation system on the sea surface, what can be imaged on the SAR sensor is t...

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Application Information

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IPC IPC(8): G01S13/90G01S13/95
CPCG01S13/90G01S13/958G01S13/9023G01S13/9076
Inventor 王勃
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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