Short-range millimeter wave fast three-dimensional imaging method with arbitrary linear array configuration

Abstract

The invention discloses a short-range millimeter wave fast three-dimensional imaging method with an arbitrary linear array configuration. The method comprises the following steps of constructing an echo signal and an imaging formula; performing NUFFT or FFT on a coordinate dimension in the echo signal; transforming the spectral domain data in the four-dimensional space into three dimensions by dimension reduction; using NUFFT for imaging. The short-range millimeter wave fast three-dimensional imaging method with an arbitrary linear array configuration provided by the invention, directed to a short-range millimeter-wave three-dimensional imaging system of "MIMO-plane scan" mode, can achieve accurate and fast three-dimensional imaging of arbitrary MIMO line array configuration with short required time-consuming for imaging and low computational complexity by adopting a "fast Gaussian mesh" based NUFFT technology.

Description

technical field [0001] The invention relates to the technical field of three-dimensional imaging, in particular to a short-range millimeter-wave fast three-dimensional imaging method with an arbitrary linear array configuration. Background technique [0002] The short-range active millimeter-wave synthetic aperture imaging technology can obtain 3D images with high dynamic range and high resolution of the target, and has a wide range of applications in the fields of dangerous goods detection, nondestructive testing, security imaging, and ground penetrating radar. Among them, the short-range millimeter-wave 3D imaging system using "Multi-Input-Multi-Output (MIMO) linear array + one-dimensional plane scanning" (referred to as "MIMO-plane scanning") is emerging in recent years and has More advantageous millimeter wave imaging system. Compared with the classic "Single-Input-Single-Output (SISO) line array + one-dimensional plane scanning" (referred to as "SISO-plane scanning") s...

AI Technical Summary

Problems solved by technology

[0003] At present, the research on "MIMO-plane scanning" mainly focuses on the system design and the optimization of the array configuration. As for the imaging algorithm, the Back Projection Algorithm (BPA) is generally used at present. Although this method can obtain good imaging Accuracy, but its algorithm complexity is high, imaging takes a long time, it is difficult to meet the application requirements

In addition, several existing imaging methods, including the back-projection algorithm, all have certain restrictions on the array configuration, and cannot achieve fast imaging of any array configuration, which limits the system design and configuration to a certain extent. degrees of freedom for type optimization

Images