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A vegetation height inversion method and device based on two SAR images

A high-level inversion and vegetation technology, applied in the direction of measuring devices, radio wave reflection/re-radiation, instruments, etc., can solve the problems of difficulty in obtaining accurate multi-view SAR images, achieve wide application range, easy implementation, and improve accuracy Effect

Active Publication Date: 2021-11-16
CENT SOUTH UNIV
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Problems solved by technology

However, in the case of only two SAR images, this model can only be expanded to a 0th-order polynomial, which is equivalent to describing the vertical structure of vegetation as a fixed constant model, which is obviously inconsistent with reality
As far as the current technology is concerned, it is still relatively difficult to accurately acquire multi-view SAR images covering the same area.

Method used

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  • A vegetation height inversion method and device based on two SAR images
  • A vegetation height inversion method and device based on two SAR images
  • A vegetation height inversion method and device based on two SAR images

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Embodiment Construction

[0051] The following is a detailed description of the embodiments of the present invention. This embodiment is carried out based on the technical solution of the present invention, and provides detailed implementation methods and specific operation processes to further explain the technical solution of the present invention.

[0052] This embodiment provides a vegetation height inversion method based on two-scene SAR images and Fourier-Legendre polynomials, such as figure 1 described, including the following steps:

[0053] Step S10, preprocessing the two SAR images to obtain the observed value of the full polarization complex coherence coefficient;

[0054] First, two SAR images about the vertical structure of the vegetation cover are obtained, and then the registration, flat phase phase removal, multi-view processing, polarization interference and other steps are sequentially performed, and finally P complex coherence coefficients of each pixel of the SAR image are obtained ...

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Abstract

The invention discloses a vegetation height inversion method and device based on two SAR images, wherein the method includes: when there are only two SAR images covering the same area, performing polarization interference processing on them to obtain a single baseline omnipolar Calculate the complex coherence coefficient; determine the spatial domain range; construct the Fourier-Legendre polynomial vegetation height inversion model based on two SAR images; determine the unknown The initial value of the parameter; according to the above-mentioned initial value of the parameter and the inversion model of the vegetation height, combined with the spatial domain, the vegetation height is obtained by using a nonlinear iterative algorithm. The invention solves the problem of limited expansion order of the existing single-baseline Fourier-Legendre polynomial model, and increases the expansion order of the Fourier-Legendre polynomial model when there are only two SAR images. Applicability and flexibility.

Description

technical field [0001] The invention relates to the field of vegetation parameter inversion of polarization synthetic aperture radar interferometry (PolInSAR), in particular to a vegetation height inversion method based on two-scene SAR images and a Fourier-Legendre polynomial vegetation height inversion model and device. Background technique [0002] Forest height and vegetation vertical structure are important indicators for studying global carbon cycle, ecological environment change, forest stock volume, etc. In recent years, the polarization synthetic aperture radar interferometry (PolInSAR) technology has developed rapidly, which can determine the phase center position of different scattering mechanisms in the same resolution unit. Theoretically, PolInSAR can extract the forest height by making the difference between the height of the volume scattering and the surface scattering phase center in the vertical direction of the vegetation. [0003] At present, the most wi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/02
CPCG01S7/02G01S13/9023G01S13/9076
Inventor 付海强张兵朱建军胡俊汪长城
Owner CENT SOUTH UNIV
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