Synthetic aperture interferometric near-field active source imaging method and device

Abstract

A synthetic aperture interference near-field active source imaging method and device, the method includes irradiating a scattering target and receiving scattered echo signals; performing cross-correlation processing on the echo signals received by different receiving units to obtain a cross-correlation function; The curvature of the phase surface in the near field is corrected to obtain the corrected cross-correlation function; Fourier transform is performed on the corrected cross-correlation function to obtain the target brightness function; the target brightness function is transformed into the space Cartesian coordinate system to obtain the position of the target. The invention utilizes the symmetry of the baseline vector in the spatial wavenumber domain to expand the comprehensive aperture to ensure higher azimuth resolution, and utilizes the fast Fourier transform relationship to ensure the calculation efficiency of the method, thereby realizing the imaging method with high resolution and high timeliness.

Description

technical field [0001] The invention relates to the technical field of single-shot multi-receiver sparsely arranged array imaging signal processing, in particular to a synthetic aperture interference near-field active source imaging method and device. Background technique [0002] The imaging method is an important link in the application steps of the millimeter-wave radar system. The accuracy and timeliness of the imaging method directly determine the quality and efficiency of the imaging results of the radar system. The millimeter-wave band imaging method based on the single-frequency point single-transmit-multi-receive sparse array is mainly designed to use a sparse planar receiving array for inversion imaging under the condition that a single transmitting unit transmits a single-frequency radar signal. This imaging method effectively solves the problem of SIMO( single-input-multiple-output) array length, array number, and azimuth resolution, while taking into account the...

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Problems solved by technology

The traditional back-projection method selects dense back-projection points on the imaging surface, so it has better resolution in azimuth direction, but also because of the large amount of calculation, the calculation efficiency of the method is low; while the frequency-wavenumber domain method uses Fu Lie transform processing scattered echo data, the method has high computational efficiency, but it uses the comprehensive aperture formed by the absolute position of the receiving unit to ensure the azimuth resolution of the imaging results, and has high requirements for antenna sampling, resulting in complex system configuration and high cost

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