Phase shift migration imaging method and device for mimo array

Abstract

A phase shift offset imaging method and device for a MIMO array, the method comprising: receiving an original scattered echo signal obtained after a broadband signal is scattered by a target; transforming the original scattered echo signal to the spatial frequency domain where the MIMO array is located, Determine the original space spectrum; expand the phase shift factor to obtain the fixed distance phase shift factor, fixed wavenumber factor and Fourier transform factor; combine the original space spectrum with the fixed distance phase shift factor and Fourier transform factor to determine the first space spectrum ; Combining the first spatial spectrum with a fixed wavenumber phase shift factor to obtain a second spatial spectrum; and determining the target imaging function according to the second spatial spectrum. The present invention accelerates the imaging speed of the MIMO phase shift migration through reasonable approximation and expansion of the phase shift migration factor, shortens the imaging time and speeds up the imaging speed under the premise of high-quality imaging.

Description

technical field [0001] The present invention relates to the technical field of signal processing, and in particular, to a phase shift offset imaging method and device for a MIMO array. Background technique [0002] MIMO radar imaging methods can be simply divided into two categories: time-domain coherent imaging algorithms and frequency-domain algorithms. The simplest of the time-domain coherent imaging algorithms is the back projection (BP) algorithm, which uses the echo data to integrate the array aperture to obtain the reconstructed image. It is huge and not suitable for real-time imaging. Commonly used frequency domain imaging algorithms include MIMO-RMA (range migration algorithm, RMA) and MIMO array-based PSM algorithm (phase shift migration, PSM). The PSM algorithm completes image reconstruction in the wavenumber domain. The biggest feature of the PSM algorithm is that it Fast Fourier transform is performed in the azimuth direction, and range-direction focusing is a...

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Problems solved by technology

The simplest time-domain coherent imaging algorithm is the back projection (BP) algorithm, which uses the integral of the echo data to the array aperture to obtain a reconstructed image. When large, not suitable for real-time imaging

Common frequency-domain imaging algorithms include MIMO-RMA (range migration algorithm, RMA) and PSM algorithm (phase shift migration, PSM) based on MIMO arrays. The PSM algorithm completes image reconstruction in the wavenumber domain. The biggest feature of the PSM algorithm is that it is Perform fast Fourier transform in the azimuth direction, and integrate in the wavenumber domain to achieve distance focus, so that a good quality imaging effect can be obtained. However, due to the integration process of one dimension, the calculation speed is compared with that of the three dimensions using Fourier The MIMO-RMA of the transformation operation is slower; although the RMA operation speed is faster, the stolt interpolation has a very large impact on the quality and time of imaging

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