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Main and auxiliary SAR image fusion method of distributed satellite SAR system

An image fusion and distributed technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problem of sidelobe elevation, low SAR image resolution, and image registration offset and the accuracy of compensating phase estimation is difficult to meet the requirements of fusion processing.

Inactive Publication Date: 2015-01-21
XIDIAN UNIV
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Problems solved by technology

When the Doppler spectral overlap of the long-baseline distributed satellite SAR system along the heading is approximately zero, and the resolution of the SAR image after azimuth pre-filtering is very low, the image registration offset and compensation obtained by traditional processing The phase estimation accuracy is difficult to meet the requirements of subsequent fusion processing, resulting in defocusing of the fused SAR image (resolution loss, side lobe elevation, etc.)

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  • Main and auxiliary SAR image fusion method of distributed satellite SAR system
  • Main and auxiliary SAR image fusion method of distributed satellite SAR system
  • Main and auxiliary SAR image fusion method of distributed satellite SAR system

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[0021] The present invention will be further described below in conjunction with accompanying drawing:

[0022] refer to figure 1 , is the flow chart of the primary and secondary SAR image fusion method of a distributed satellite SAR system of the present invention, and its specific steps are:

[0023] Step 1, use the distributed satellite SAR system to obtain the main SAR image data (the main SAR image data is obtained by the main synthetic aperture radar of the distributed satellite synthetic aperture radar) and the auxiliary SAR image data (the auxiliary SAR image data is obtained by the distributed satellite synthetic aperture radar Auxiliary synthetic aperture radar acquisition). The main SAR image data and the auxiliary SAR image data must meet the quality requirements of interferometric processing in terms of coherence and imaging quality.

[0024] Set the SAR imaging processing parameters. In the embodiment of the present invention, the SAR imaging processing paramet...

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Abstract

The invention belongs to the technical field of SAR image azimuth resolution ratio improvement and particularly relates to a main and auxiliary SAR image fusion method of a distributed satellite SAR system. The main and auxiliary SAR image fusion method comprises the specific steps of Doppler spectrum envelope correction, radar geometric method based image registration, terrain phase inversion, registration error and residual phase deviation estimation based on an SAR image maximum contrast ratio method, main and auxiliary SAR image fine registration and phase deviation correction and Doppler spectrum splicing. The main and auxiliary SAR image fusion method can conduct effective image fusion on main and auxiliary SAR images so as to improve azimuth resolution ratio and meet the performance requirement of high-quality InSAR processing under the situation that the Doppler spectrum overlapping degree of the distributed satellite SAR system along a long base line of the course approximates to zero.

Description

technical field [0001] The invention belongs to the technical field of SAR image azimuth resolution improvement, and particularly relates to a main and auxiliary SAR image fusion method of a distributed satellite SAR system. , the resolution of the SAR image after azimuth pre-filtering is very low, and when the image registration offset and compensation phase estimation accuracy estimated by traditional processing are difficult to meet the requirements of subsequent processing, the present invention can perform effective image processing on the main and auxiliary SAR image pairs. Fusion to improve azimuth resolution. Background technique [0002] The azimuth resolution of SAR images is closely related to the synthetic aperture length (corresponding to the azimuth bandwidth) of the radar observation target, and it increases with the increase of the synthetic aperture length. SAR image fusion technology uses multiple SAR images with different viewing angles to fuse and proces...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9017G01S13/9023G01S13/9027
Inventor 李真芳李莉媛侯英龙刘艳阳李锦伟
Owner XIDIAN UNIV
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