Terahertz coded-aperture imaging for moving targets based on an incoherent detection array.

Terahertz coded-aperture imaging relies on sequential coding and sampling. Its capturing speed is limited by the switching rate of the coded-aperture antenna; therefore, it is not suitable for capturing moving targets. In this paper, we focus on imaging for moving targets using the terahertz coded-aperture imaging technique. An incoherent detection array is adopted to replace sequential sampling by spatial sampling, therefore improving the capturing speed significantly. Then, a signal processing method based on phase retrieval and image enhancement is proposed to reconstruct targets with improved quality. Numerical experimental results verify the effectiveness of the method.

[1]  David R. Smith,et al.  Design and Analysis of a W-Band Metasurface-Based Computational Imaging System , 2017, IEEE Access.

[2]  Sheng Li,et al.  Development of Superconducting Spectroscopic Array Receiver: A Multibeam 2SB SIS Receiver for Millimeter-Wave Radio Astronomy , 2012, IEEE Transactions on Terahertz Science and Technology.

[3]  N. Vieweg,et al.  Terahertz imaging: applications and perspectives. , 2010, Applied optics.

[4]  J. Horner,et al.  Phase-only matched filtering. , 1984, Applied optics.

[5]  Shin‐Tson Wu,et al.  Fast-Response Liquid Crystal Phase Modulators with an Excellent Photostability , 2020 .

[6]  Xiang Wan,et al.  Transmission-Type 2-Bit Programmable Metasurface for Single-Sensor and Single-Frequency Microwave Imaging , 2016, Scientific Reports.

[7]  Michael T. Orchard,et al.  A fast direct Fourier-based algorithm for subpixel registration of images , 2001, IEEE Trans. Geosci. Remote. Sens..

[8]  J. Grzyb,et al.  THz Direct Detector and Heterodyne Receiver Arrays in Silicon Nanoscale Technologies , 2015 .

[9]  Ziyang Yuan,et al.  Phase Retrieval via Sparse Wirtinger Flow , 2017, J. Comput. Appl. Math..

[10]  Xingzhao Liu,et al.  Wirtinger Flow Method With Optimal Stepsize for Phase Retrieval , 2016, IEEE Signal Processing Letters.

[11]  J R Fienup,et al.  Phase retrieval algorithms: a comparison. , 1982, Applied optics.

[12]  Emmanuel J. Candès,et al.  PhaseLift: Exact and Stable Signal Recovery from Magnitude Measurements via Convex Programming , 2011, ArXiv.

[13]  R. Gerchberg.  A practical algorithm for the determination of phase from image and diffraction plane pictures , 1972 .

[14]  David R. Smith,et al.  Large Metasurface Aperture for Millimeter Wave Computational Imaging at the Human-Scale , 2017, Scientific Reports.

[15]  Henry Arguello,et al.  Coded aperture design in mismatched compressive spectral imaging. , 2015, Applied optics.

[16]  Nuria Llombart,et al.  THz Imaging Radar for Standoff Personnel Screening , 2011, IEEE Transactions on Terahertz Science and Technology.

[17]  David R. Smith,et al.  Terahertz compressive imaging with metamaterial spatial light modulators , 2014, Nature Photonics.

[18]  A. Rogalski,et al.  Terahertz detectors and focal plane arrays , 2011 .

[19]  Robert M. Weikle,et al.  A 200 GHz Schottky Diode Quasi-Optical Detector Based on Folded Dipole Antenna , 2009 .

[20]  Jun Dong,et al.  Phaseless Terahertz Coded-Aperture Imaging for Sparse Target Based on Phase Retrieval Algorithm , 2019, Sensors.

[21]  Yonina C. Eldar,et al.  Phase Retrieval with Application to Optical Imaging: A contemporary overview , 2015, IEEE Signal Processing Magazine.

[22]  David R. Smith,et al.  Metamaterial Apertures for Computational Imaging , 2013, Science.

[23]  Patrik O. Hoyer,et al.  Non-negative Matrix Factorization with Sparseness Constraints , 2004, J. Mach. Learn. Res..

[24]  Bin Deng,et al.  Study on coding strategies for radar coded-aperture imaging in terahertz band , 2017, J. Electronic Imaging.

[25]  Long Peng,et al.  Fast Terahertz Coded-Aperture Imaging Based on Convolutional Neural Network , 2020, Applied Sciences.

[26]  Zhishen Tong,et al.  Spectral Camera based on Ghost Imaging via Sparsity Constraints , 2015, Scientific Reports.

[27]  Xiaodong Li,et al.  Phase Retrieval via Wirtinger Flow: Theory and Algorithms , 2014, IEEE Transactions on Information Theory.

[28]  Todd R. Hunter,et al.  Terahertz-frequency waveguide NbN hot-electron bolometer mixer , 2001 .

[29]  Yongqiang Cheng,et al.  Adaptive sparse reconstruction with joint parametric estimation for high-speed uniformly moving targets in coincidence imaging radar , 2016 .