Large-scene high-resolution imaging method and device based on block imaging

Abstract

The invention relates to a large-scene high-resolution imaging method and device based on block imaging. The method comprises the following steps of: segmenting an imaging area into corresponding sub-imaging areas according to an effective imaging range of a PFA, refocusing echo signals corresponding to the sub-imaging areas to the central positions of the sub-imaging areas, obtaining refocused echo signals corresponding to the sub-imaging regions in a distance Doppler domain, sequentially carrying out lOSPI interpolation, two-dimensional IFFT and image distortion correction interpolation operation on the refocused echo signals to obtain sub-block images corresponding to the sub-imaging areas, and splicing the sub-block images to obtain corresponding large-scene high-resolution image data. The block imaging algorithm provided by the invention solves the problem that the focusing depth of a traditional PFA algorithm is small, does not depend on a radar track, solves the defects that the calculation amount is large and the operation time is long in the traditional block imaging algorithm, and can achieve high-resolution imaging of a large scene.

Description

technical field [0001] The invention belongs to the field of radar imaging, and in particular relates to a large-scene high-resolution imaging method and device based on block imaging. Background technique [0002] Circular Synthetic Aperture Radar (CSAR) is a special mode of Synthetic Aperture Radar (SAR). CSAR achieves synthetic aperture through circular motion of the platform. It is different from the strip SAR observation geometry. During the process of CSAR recording data, The carrier platform moves along a circular trajectory, and the beam always points to the center of the observation area, which greatly increases the accumulation time of the observation target, obtains all-round information of the target, and can monitor the detection area for a long time. CSAR has all-round angle observation, wavelength-level high resolution, and three-dimensional imaging capabilities. However, compared with strip SAR, its circular motion method introduces serious two-dimensional co...

AI Technical Summary

Problems solved by technology

However, this type of method has the problem of large amount of calculation and discontinuity at the image stitching, which seriously affects the image quality.

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