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Multi-baseline PolInSAR vegetation parameter inversion method considering the temporal decoherence factor

A decoherent, multi-baseline technology, applied in the reflection/re-radiation of radio waves, radio wave measurement systems, and the use of re-radiation, etc. Improve the accuracy of the solution, the inversion method is simple and clear, and the effect of reducing the difficulty

Active Publication Date: 2020-01-17
CENT SOUTH UNIV
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Problems solved by technology

Therefore, in heavy-orbit interferometric mode, using PolInSAR technology for vegetation height inversion, the influence of time decoherence factor cannot be ignored, otherwise the accuracy of vegetation height inversion is relatively low
[0005] Therefore, it is necessary to design a multi-baseline PolInSAR vegetation parameter inversion method, which can compensate for the influence of time decoherence factors on vegetation parameter inversion in the heavy orbit interferometric mode; at the same time, it can solve the problem of insufficient observation information in the model-based calculation process Rank deficiency problem leading to unknown parameter solution

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  • Multi-baseline PolInSAR vegetation parameter inversion method considering the temporal decoherence factor
  • Multi-baseline PolInSAR vegetation parameter inversion method considering the temporal decoherence factor
  • Multi-baseline PolInSAR vegetation parameter inversion method considering the temporal decoherence factor

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[0042] 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.

[0043] A multi-baseline PolInSAR vegetation parameter inversion method considering time decoherence factors, such as figure 1 shown, including the following steps:

[0044] Step 0, build the RVoG extended model;

[0045] The time decoherence factor is introduced into the RVoG model, and the RVoG extended model taking into account the time decoherence factor is obtained:

[0046]

[0047] The vegetation scene is represented using the RVoG extended model, where:

[0048] ω denotes the polarization state associated with the baseline and polarization mode;

[0049] Indicates the surface phase, which is geometrically related to the interference baseline...

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Abstract

The invention discloses a multi-baseline PolInSAR vegetation parameter inversion method considering the temporal decoherence factor. The method comprises the following steps: 0, introducing the temporal decoherence factor into a RVoG model to obtain a RVoG expansion model considering the temporal decoherence factor; 1, carrying out processing and polarimetric interferometry processing on a multi-baseline polarimetric interferometry SAR (Synthetic Aperture Radar) image of vegetation to obtain a multi-baseline multi-polarization multiple correlation coefficient observed value; 2, setting and calculating the vegetation parameter inversion initial value of the RVoG expansion model; 3, selecting one of N baselines as a reference baseline, and considering that the influence of the temporal decoherence factor does not exist; and 4, matching the observed value with the RVoG expansion model, building an observation equation, and finally performing vegetation parameter inversion by a nonlinear iterative algorithm according to the parameter initial value obtained above. The method can improve the accuracy of vegetation parameter inversion, and is easy to implement.

Description

technical field [0001] The invention relates to the field of polarization interferometric synthetic aperture radar (PolInSAR) vegetation parameter inversion, in particular to a multi-baseline PolInSAR vegetation parameter inversion method considering time decoherence factors. Background technique [0002] Polarization interferometric synthetic aperture radar (PolInSAR) technology is a new type of microwave remote sensing technology, which extends the concept of radar polarization to the interference space. PolInSAR technology can be used to separate the position and vertical distribution of different scattering mechanisms in the same resolution unit. In the vegetation area, the vegetation canopy and the scattering center position of the ground surface can be distinguished, and then the vegetation height can be extracted from it. At present, PolInSAR technology is already one of the most potential methods for regional high-precision and even global-scale vegetation height ret...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S7/02G01S13/90
CPCG01S7/024G01S7/41G01S13/9023G01S13/9027G01S13/9076
Inventor 付海强张兵朱建军李志伟汪长城
Owner CENT SOUTH UNIV
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