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Sensors 2017, 17(10), 2438; https://doi.org/10.3390/s17102438

Near-Field Three-Dimensional Planar Millimeter-Wave Holographic Imaging by Using Frequency Scaling Algorithm

College of Electronic Science, National University of Defense Technology, Changsha 410073, China
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Received: 23 August 2017 / Revised: 15 October 2017 / Accepted: 23 October 2017 / Published: 24 October 2017
(This article belongs to the Section Remote Sensors)
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Abstract

In this paper, a fast three-dimensional (3-D) frequency scaling algorithm (FSA) with large depth of focus is presented for near-field planar millimeter-wave (MMW) holographic imaging. Considering the cross-range range coupling term which is neglected in the conventional range migration algorithm (RMA), we propose an algorithm performing the range cell migration correction for de-chirped signals without interpolation by using a 3-D frequency scaling operation. First, to deal with the cross-range range coupling term, a 3-D frequency scaling operator is derived to eliminate the space variation of range cell migration. Then, a range migration correction factor is performed to compensate for the residual range cell migration. Finally, the imaging results are obtained by matched filtering in the cross-range direction. Compared with the conventional RMA, the proposed algorithm is comparable in accuracy but more efficient by using only chirp multiplications and fast Fourier transforms (FFTs). The algorithm has been tested with satisfying results by both simulation and experiment. View Full-Text
Keywords: frequency scaling algorithm; near-field; millimeter-wave; 3-D holographic imaging frequency scaling algorithm; near-field; millimeter-wave; 3-D holographic imaging
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Zhang, Y.; Deng, B.; Yang, Q.; Gao, J.; Qin, Y.; Wang, H. Near-Field Three-Dimensional Planar Millimeter-Wave Holographic Imaging by Using Frequency Scaling Algorithm. Sensors 2017, 17, 2438.

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