Three-dimensional focus imaging method of side-looking chromatography synthetic aperture radar

Abstract

The invention relates to a three-dimensional focus imaging method for a side-looking chromatography synthetic aperture radar, which comprises the steps: converting collected original echoed data of the side-looking chromatography synthetic aperture radar to a slope distance wave-number domain and an azimuth wave-number domain, performing elevation frequency spectrum aliasing-free recovery on converted signals and converting the signals to a slope distance three-dimensional wave-number domain, an azimuth three-dimensional wave-number domain and an elevation three-dimensional wave-number domain; converting the signals in the three-dimensional wave-number domains to a rectangular coordinate system by coordinate mapping; and reconstructing a three-dimensional microwave image containing slope distance, azimuth and elevation spatial location information of imaging areas and magnitude-phase information by inverse Fourier transform and image space selection. The method can precisely reconstruct three-dimensional microwave images in the imaging areas without geometry correction on the condition that elevation hits are less, the distribution of elevation synthetic aperture centers is arbitrary or the size of the imaging areas are arbitrary. The method can be also used for the reconstruction of three-dimensional microwave images in imaging observation geometries such as downward-looking, downward side-looking chromatography SARs, and the like.

Description

technical field [0001] The invention relates to the technical field of information acquisition and processing, in particular to a three-dimensional focusing imaging method for side-view tomography synthetic aperture radar, which can acquire three-dimensional microwave images of imaging regions. Background technique [0002] Side-looking tomosynthetic aperture radar is a new three-dimensional synthetic aperture radar imaging technology, such as figure 1 , where OXYZ is the three-dimensional Cartesian coordinate system where the side-looking tomosynthetic aperture radar and its imaging area are located, and P n (x n ,y n ,z n ) is the nth point target and its coordinates in the imaging area, X 0 , Y 0 and Z 0 are the ground-range width, azimuth length, and elevation height of the imaging area, X c is the distance from the center of the imaging area. By conducting multi-view observations on the same imaging area along the elevation direction at different heights Z, a se...

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem that the existing 3D focusing imaging method and 3D ECS method are only suitable for the special observation geometry in the imaging geometry of side-looking tomosynthetic aperture radar, and the sampling interval of side-looking tomosynthetic aperture radar is too small along the elevation direction, and the The center of the synthetic aperture is located near the central plane of the imaging area of ​​the side-view tomographic synthetic aperture radar, and the ground-to-width width of the imaging area is approximately equal to the height of the imaging area, which is not conducive to practical applications. The purpose of the present invention is to provide a solution for Based on the arbitrary imaging geometry of side-view tomographic synthetic aperture radar, an accurate three-dimensional focusing imaging method that does not require geometric correction, for this reason, the present invention provides a three-dimensional focusing imaging method for side-looking tomographic synthetic aperture radar

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