Imaging method and apparatus of wide angle synthetic aperture radar

Abstract

The invention provides an imaging method of wide angle synthetic aperture radar WASAR. The imaging method of WASAR includes the steps: performing backward projection imaging on the echo of the whole aperture of the WASAR, and determining part of known support set; according to a preset angle, dividing the whole aperture into a plurality of sub apertures, and determining a reconstruction model; based on a hard threshold iteration algorithm, according to the reconstruction model, the part of known support set and a backward projection imaging operator, determining the scattering intensity of subaperture images; and according to the maximum value of the scattering intensity of all the coordinates of the aperture image in each sub aperture image, determining an integrated image. Besides, theinvention also provides a corresponding apparatus of the imaging method of WASAR. Through backward projection, on the basis of the improved compression sensing method and the hard threshold iterationalgorithm of the part of known support set, the imaging method of WASAR can improve a traditional compression sensing WASAR sub aperture imaging method, and can effectively reconstruct each orientation scattering of the anisotropy target in WASAR, thus reducing the false target number and achieving better visual effect.

Description

technical field [0001] The invention relates to the technical field of radar imaging, in particular to an imaging method and device for a wide-angle synthetic aperture radar. Background technique [0002] Wide angle synthetic aperture radar (WASAR) refers to a type of synthetic aperture radar (SAR) observation mode in which the synthetic aperture angle meets the requirement that the azimuth resolution is greater than the range resolution. Due to the collection of radar backscatter information of observed targets in a large angle range, WASAR can obtain high-resolution radar images, thus providing the potential of target recognition and visualization that conventional SAR does not have. [0003] WASAR imaging needs to consider the scattering characteristics of the target as it changes with the viewing angle. Due to factors such as overlapping, scintillation, and non-ideal geometric characteristics of the target, the scattering information of the target varies greatly within ...

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