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A short-wavelength dual-antenna insar forest height retrieval method with improved coherence calculation method

A calculation method and height inversion technology, applied in radio wave reflection/re-radiation, radio wave measurement systems, instruments, etc., can solve the problem of incomplete homomorphism in coherence coefficient calculation and model expression, and cannot guarantee forest height inversion results Accuracy, forest height inversion error and other issues

Active Publication Date: 2022-08-02
RES INST OF FOREST RESOURCE INFORMATION TECHN CHINESE ACADEMY OF FORESTRY
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Problems solved by technology

[0015] The correction method of formula (5) is essentially an empirical correction method. The defect of this method is that many decoherence factors are not easy to calculate, so some scholars usually assume that other decoherence factors are small or can be calculated by predicting Improved processing methods (Feng Qi et al., 2016)
The calculation of the coherence coefficient in the existing technical process does not fully take this assumption into account, resulting in the situation that the calculation of the coherence coefficient and the model expression are not completely homomorphic in terms of amplitude and phase, which will introduce errors in forest height inversion, and cannot Guarantee the accuracy of forest height inversion results

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  • A short-wavelength dual-antenna insar forest height retrieval method with improved coherence calculation method
  • A short-wavelength dual-antenna insar forest height retrieval method with improved coherence calculation method
  • A short-wavelength dual-antenna insar forest height retrieval method with improved coherence calculation method

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Embodiment Construction

[0047] A short-wavelength dual-antenna InSAR forest height inversion method with improved coherence calculation method. When calculating the forest height, the InSAR coherence coefficient γ is used. gc-1 It is obtained by the following formula,

[0048]

[0049] In the formula, E() represents the expectation, a is a constant, represents the uniform amplitude of all pixels participating in the calculation of the coherence coefficient, Φ represents the interference phase of the main and auxiliary images, Φ top Represents the understory terrain phase.

[0050] Based on the calculated InSAR coherence coefficient γ gc-1 , the forest height H is obtained by the following formula v ,

[0051] |γ|=sinc(H v k z / 2)

[0052]

[0053] where γ represents the used InSAR coherence coefficient γ gc-1 , H v stands for the height of the forest, k z Represents the vertical effective wavenumber.

[0054] Vertical effective wavenumber k z It is calculated according to the imaging...

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Abstract

The invention relates to a short-wavelength dual-antenna InSAR forest height inversion method with an improved coherence calculation method, which is characterized in that: when calculating the forest height, the InSAR coherence coefficient γ used is gc‑1 Obtained by the following formula, where E() represents the expectation, a is a constant, represents the uniform amplitude of all pixels participating in the calculation of the coherence coefficient, Φ represents the interference phase of the main and auxiliary images, Φ top Represents the understory terrain phase.

Description

technical field [0001] The invention relates to a short-wavelength dual-antenna InSAR forest height inversion method with improved coherence calculation method. Background technique [0002] Forest height is an important parameter that reflects the current situation of forest resources. Obtaining large-scale and accurate forest height information is of great significance to the management of forest resources and forest-related scientific research. Interferometric Synthetic Aperture Radar (InSAR) is one of the remote sensing technologies capable of obtaining height information of large forests. Among them, short-wavelength dual-antenna InSAR has certain advantages in forest height information detection due to its characteristics of no time decoherence and easy implementation of observation platforms. At present, a variety of forest height inversion methods have been developed based on short-wavelength dual-antenna InSAR data, among which the more classic is the SINC model in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9023
Inventor 赵磊陈尔学李增元
Owner RES INST OF FOREST RESOURCE INFORMATION TECHN CHINESE ACADEMY OF FORESTRY
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