Abstract
Millimeter-wave technology has been widely used in near range targets imaging scenarios, such as mechanical scanning and multiple input multiple output (MIMO) array imaging. Emerging scanning array regimes increase the need for fast-speed and high-quality imaging techniques, which, however, are often subject to specific array positions. Moreover, the relationship between array positions and the imaging performance is not clear, which leads to no uniform standard for array design. In this paper, a series of array configurations are designed to explore the impact of different array positions on the cross-range imaging performance. Meanwhile, a novel fast fully focused imaging algorithm with wavenumber domain properties is presented, which is not constrained by the positions of the transmitters and receivers. Simulation and experimental results show that, compared with a conventional algorithm, the proposed algorithm has a faster imaging speed under the same imagining quality. This study provides a feasible method for fast fully focused imaging in the case of location-constrained MIMO arrays, or partially damaged transceivers.
Highlights
With the development of transportation and expressage, the detection of hidden dangers becomes more and more urgent [1]
The point spread function (PSF) is an important metric for 1D-multiple input multiple output (MIMO) array design, which describes the response of an imaging system to a point object
The proposed algorithm is compared with classical back projection (BP) algorithm and fresh enhanced algorithm
Summary
With the development of transportation and expressage, the detection of hidden dangers becomes more and more urgent [1]. The mechanical scanning and multiple input multiple output (1D-scanning-1D-MIMO) array imaging technique has aroused extensive attention, which can exhibit both high imaging performance and low cost. Due to a long array aperture paralleled with a wideband transmitted signal, the MMW imaging techniques based on 1D-scanning-1D-MIMO array can achieve fine spatial resolution, thereby forming high-quality 3D images. Several fast imaging algorithms [10,11,12] are proposed, most of them are only suitable for specific array structure or cannot achieve fully-focused imaging, and there is not much quantitative analysis about the influence of array structure on the point spread function of MIMO array. An efficient fully focused imaging algorithm for 1D-scanning-1D-MIMO array is proposed, where both transmitters and receivers can be distributed for free in the 1D-MIMO array.
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