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A Multi-baseline Polinsar Vegetation Parameter Inversion Method Considering Temporal Decrelation Factor

A decoherent, multi-baseline technology, applied in the reflection/re-radiation of radio waves, radio wave measurement systems, and utilization of re-radiation, etc. The effect of improving the accuracy of vegetation parameters, reducing the difficulty, and improving the accuracy of the solution

Active Publication Date: 2021-06-22
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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  • A Multi-baseline Polinsar Vegetation Parameter Inversion Method Considering Temporal Decrelation Factor
  • A Multi-baseline Polinsar Vegetation Parameter Inversion Method Considering Temporal Decrelation Factor
  • A Multi-baseline Polinsar Vegetation Parameter Inversion Method Considering Temporal Decrelation Factor

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Embodiment Construction

[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 baselin...

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Abstract

The invention discloses a multi-baseline PolInSAR vegetation parameter inversion method considering the time decoherence factor, comprising the following steps: step 0, introducing the time decoherence factor into the RVoG model, and obtaining the RVoG extended model taking the time decoherence factor into consideration; step 1. Perform preprocessing and polarization interferometry on the multi-baseline polarization interferometric SAR image of the vegetation to obtain multi-baseline multi-polarization complex coherence coefficient observations; step 2. Set and calculate the initial value of the vegetation parameter inversion of the RVoG extended model ; Step 3, select one of the N baselines as a reference baseline, and consider that it does not have the influence of time decoherence factors; Step 4, match the observed values ​​with the RVoG extended model, and construct the observation equation; finally, according to the parameters obtained above value, using a nonlinear iterative algorithm for vegetation parameter inversion. The invention can improve the accuracy of vegetation parameter inversion and is easy to realize.

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...

Claims

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Application Information

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Patent Type & Authority Patents(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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