Near-Field Millimeter-Wave Imaging via Arrays in the Shape of Polyline

TL;DR

This paper introduces a novel polyline-shaped array system for near-field millimeter-wave imaging, utilizing mechanical scanning and advanced 3-D algorithms to enhance observation angles and computational efficiency.

Contribution

The work proposes a new polyline array design with hybrid 3-D imaging algorithms and NUFFT for improved near-field MMW imaging performance.

Findings

Enhanced observation angles with polyline array.

Effective 3-D imaging using hybrid time and frequency domain processing.

Improved computational efficiency with NUFFT.

Abstract

This paper proposes a polyline shaped array based system scheme, associated with mechanical scanning along the perpendicular direction of the array, for near-field millimeter-wave (MMW) imaging. Each section of the polyline is a chord of a circle with equal length. The polyline array, which can be realized as a monostatic array or a multistatic one, is capable of providing more observation angles than the linear or planar arrays. Further, we present the related three-dimensional (3-D) imaging algorithms based on a hybrid processing in the time domain and the spatial frequency domain. The nonuniform fast Fourier transform (NUFFT) is utilized to improve the computational efficiency. Simulations and experimental results are provided to demonstrate the efficacy of the proposed method in comparison with the back-projection (BP) algorithm.