Ionosphere chromatography imaging hybrid inversion method based on conjugate gradient method
A technique of conjugate gradient method and tomography, applied in image enhancement, image analysis, image data processing, etc., can solve the problem of filter divergence, incomplete projection of Fourier transform method, and difficulty in achieving high-precision ionospheric electron density Inversion and other issues
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[0048] Such as figure 1 As shown, the specific implementation steps of the present invention are as follows:
[0049] Firstly, using tri-frequency beacon data, considering the ionospheric scattering effect, add the scattering effect time delay term in the absolute and relative total electron density inversion, and obtain the total ionospheric electron content through three-frequency difference; secondly, select the ionosphere In the area to be inverted, combined with spatial geometric calculations, the tomographic projection matrix is obtained; finally, a hybrid inversion method combining multiplicative algebraic reconstruction algorithm and conjugate gradient method is used to obtain the ionospheric electron density distribution. Specific steps are as follows:
[0050] The first step is to calculate the total electron content of the ionosphere based on the tri-frequency beacon observation:
[0051] The tri-frequency beacon includes three different frequency carriers: UHF, VHF a...
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