A terahertz radar ultra-high resolution imaging method

Abstract

The invention belongs to the technical field of radar signal processing, and in particular relates to a terahertz radar ultra-high resolution imaging method. The scattering energy anisotropy of targets in the terahertz frequency band is relatively severe, and the usual method for imaging such targets is to divide the large aperture into small apertures and jointly image the sub-aperture images. The smaller the sub-aperture, the clearer the details in the aperture. The present invention The feature is that in the process of sub-aperture division, an algorithm based on sub-aperture cross-correlation coefficient combined with sub-aperture energy is used to determine the sub-aperture boundary, and in the method of sub-aperture division, a technique of overlapping a part of the sub-apertures in sequence is adopted. The former better solves the problem of sidelobe defocus when using small-aperture sub-aperture joint imaging for targets with anisotropic scattering energy. The latter solves the incomplete imaging details caused by the angular scattering energy being truncated by the edge of the sub-aperture when the small-aperture sub-aperture joint imaging is used for the target with anisotropic scattering energy.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a terahertz radar ultra-high resolution imaging method. Background technique [0002] For the imaging of targets with anisotropic scattering energy, if the coherent accumulation imaging of wide-aperture data is directly used, the strong scattering energy of the scatterers is only concentrated in a small part of the aperture, which will reduce the signal-to-noise ratio of the target and blur the edges and corners of the target. . The traditional imaging method for imaging targets with anisotropic scattering energy is: divide the wide aperture into multiple sub-apertures with fixed centers and equal widths, and non-correlationally combine these sub-aperture images to form a fusion image based on the GLRT imaging method, and the sub-aperture width The smaller the aperture, the clearer the details. Because terahertz radar has the disadvantage of more int...

AI Technical Summary

Problems solved by technology

The realization of this technology depends on a certain chance, so the imaging effect is unstable

At the same time, this technology only images sub-apertures with higher energy, but actually loses a lot of imaging details, and cannot achieve ultra-high resolution imaging.

And the sub-aperture energy is used to divide the sub-aperture, and then unifying the sub-aperture width does not set the sub-aperture boundary at the most reasonable position, resulting in this method not completely solving the sidelobe defocus problem of small-aperture sub-aperture division imaging, and the imaging effect is somewhat blurred

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