Airborne SAR (Synthetic Aperture Radar) high-resolution tomography method

A tomography, high-resolution technology, used in the reflection/re-radiation of radio waves, the use of re-radiation, measurement devices, etc.
CN110488288AActive Publication Date: 2019-11-22XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2019-11-22

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Abstract

The invention discloses an airborne SAR high-resolution tomography method. The method comprises the following steps: acquiring a two-dimensional SAR image; registering the two-dimensional SAR image toobtain a registered two-dimensional SAR image; performing phase error correction on the registered two-dimensional SAR image to obtain a two-dimensional SAR image after phase correction; obtaining atarget pixel point and a coordinate of the target pixel point in a geocentric earth-fixed coordinate system from the two-dimensional SAR image after phase correction; constructing an imaging grid in the elevation direction according to the target pixel points and the coordinates; finding out homonymous pixel points from the two-dimensional SAR image after phase correction according to the imaginggrid in the elevation direction and the target pixel points; and performing focusing imaging according to the target pixel points and the homonymous pixel points to obtain a three-dimensional SAR image. According to the invention, tomography is carried out on different navigations, so that the problem of serious deterioration of elevation direction sidelobes when vertical effective baselines are distributed unevenly is solved, and the defect of inaccurate declination during elevation direction focusing is also avoided, so that high-resolution tomography is realized.
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Description

technical field

[0001] The invention belongs to the technical field of radar signal processing, and in particular relates to an airborne SAR high-resolution tomographic imaging method. Background technique

[0002] Tomosynthetic aperture radar imaging technology is a cutting-edge technology in modern radar remote sensing measurement. The essence of this imaging technology is to make multiple observations of the same scene or ground object from different perspectives in the elevation direction. A single observation forms a two-dimensional synthetic aperture radar image, and multiple observations form a synthetic aperture in the elevation direction, focusing along the elevation direction to achieve elevation upward scatterer resolution, thereby realizing high-resolution three-dimensional imaging of the target. Compared with two-dimensional SAR images, tomosynthetic aperture radar imaging technology can accurately estimate the height position and scattering intensity of differ...

Claims

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