Volume 48 Issue 1
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Jing Wen, Cui Zhenmao, Cheng Binbin, Jiang Ge, Zhang Jian. Terahertz holographic radar speckle suppression method based on multi-look correction of correlation angle[J]. Infrared and Laser Engineering, 2019, 48(1): 125005-0125005(9). doi: 10.3788/IRLA201948.0125005
Citation: Jing Wen, Cui Zhenmao, Cheng Binbin, Jiang Ge, Zhang Jian. Terahertz holographic radar speckle suppression method based on multi-look correction of correlation angle[J]. Infrared and Laser Engineering, 2019, 48(1): 125005-0125005(9). doi: 10.3788/IRLA201948.0125005
shu

Terahertz holographic radar speckle suppression method based on multi-look correction of correlation angle

doi: 10.3788/IRLA201948.0125005
  • 1.

    Institute of Eletronic Engineering,China Academy of Engineering Physics,Mianyang 621900,China;

  • 2.

    Microsystem &Terahertz Research Center,China Academy of Engineering Physics,Chengdu 610200,China

  • Received Date: 2018-08-10
  • Rev Recd Date: 2018-09-12
  • Publish Date: 2019-01-25
  • In the MIMO based terahertz three-dimensional imaging radar for human security screening, the speckle effect affects the detection and recognition performance of hidden contraband seriously. For this reason, effective suppression of terahertz holographic speckle is demanded urgently. By using the angle based degree of freedom for speckle suppression obtained by the target rotation, a terahertz holographic radar speckle suppression method based on multi-look correction of correlation angle was proposed. Meanwhile, the angle sensitivity of the target scattering was carefully considered. In theory, the normalized covariance expression of the holographic radar speckle intensity under the relevant angle illumination was derived, and the speckle contrast after multi-view processing was given. Experimentally, based on the fast speed of the 340 GHz MIMO based imaging system, single-look images of low-speed rotating target were obtained. The imaging space rotation correction, target registration and multi-look processing were performed on each single-look image under the relevant viewing angle. The speckle contrast of the averaged reconstructed image was reduced to 44% of a single reconstructed image. The processed speckle was effectively suppressed with distinct target contour and details. The proposed method can effectively suppress speckle noise and achieve image enhancement without increasing system complexity.
  • [1] Herschel R, Briese G, Lang S A, et al. Focused imaging by geometric optics for real-time passenger screening at sub-millimeter wave frequencies[C]//Microwave Conference, IEEE, 2017:1549-1552.
    [2] Gao Jingkun, Cui Zhenmao, Cheng Binbin, et al. Fast three-dimensional image reconstruction of a standoff screening system in the terahertz regime[J]. IEEE Transactions on Terahertz Science Technology, 2018, 8(1):1-14.
    [3] Sheen D M, Hall T E, Severtsen R H, et al. Active wideband 350 GHz imaging system for concealed-weapon detection[C]//SPIE, 2009, 7309:73090I.
    [4] Patrick M A. Illumination strategies to reduce target orientation requirements and speckle in millimeter wave imaging[D]. USA:The Ohio State University, 2014.
    [5] Jaeger I, Stiens J, Koers G, et al. Hadamard speckle reduction for millimeter wave imaging[J]. Microwave Optical Technology Letters, 2006, 48(9):1722-1725.
    [6] Jaeger I, Stiens J, Zhang Lixiao, et al. Comparison of speckle reduction diversity tools for active millimeter-wave imaging[J]. Journal of the Optical Society of America A Optics Image Science Vision, 2008, 25(7):1716-1721.
    [7] Xu Meifang, Ding Junwen, Wang Guanjun, et al. Comparison of laser speckle suppression due to angle diversity[J]. Infrared and Laser Engineering, 2017, 46(8):0806004. (in Chinese)徐美芳, 丁俊文, 王冠军, 等.角度多样性激光散斑抑制方法的比较[J]. 红外与激光工程, 2017, 46(8):0806004.
    [8] Petkie D T, Holt J A, Patrick M A, et al. Multimode illumination in the terahertz for elimination of target orientation requirements and minimization of coherent effects in active imaging systems[J]. Optical Engineering, 2012, 51(9):091604.
    [9] Patrick M A, Joye C D, Lucia F C D, Multimode illumination for speckle reduction and angle neutrality in millimeter wave active imaging:range and time-resolved mode averaging[J]. Journal of the Optical Society of America A Optics Image Science Vision, 2014, 31(10):2135-2141.
    [10] Patrick M A, Holt J A, Joye C D, et al. Range resolved mode mixing in a large volume for the mitigation of speckle and strategic target orientation requirements in active millimeter-wave imaging[J]. Journal of the Optical Society of America A Optics Image Science Vision, 2015, 32(4):637-646.
    [11] Goodman J W. Speckle Phenomena in Optics:Theory and Applications[M]. Englewood:Roberts Company, 2007.
    [12] Cui Zhenmao, Gao Jingkun, Lu Bin, et al. Real time 3D imaging system based on sparse MIMO array at 340 GHz[J]. Journal of Infrared and Millimeter Waves, 2017, 36(1):102-106. (in Chinese)崔振茂, 高敬坤, 陆彬, 等. 340 GHz稀疏MIMO阵列实时3-D成像系统[J]. 红外与毫米波学报, 2017, 36(1):102-106.
    [13] Jiang Yanwen, Qin Yuliang, Wang Hongqiang, et al. A side-lobe suppression method based on coherence factor for terahertz array imaging[J]. IEEE Access, 2018, 6:5584-5588.
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Terahertz holographic radar speckle suppression method based on multi-look correction of correlation angle

doi: 10.3788/IRLA201948.0125005
  • 1. Institute of Eletronic Engineering,China Academy of Engineering Physics,Mianyang 621900,China;
  • 2. Microsystem &Terahertz Research Center,China Academy of Engineering Physics,Chengdu 610200,China
  • Received Date: 2018-08-10
  • Rev Recd Date: 2018-09-12
  • Publish Date: 2019-01-25

Abstract: In the MIMO based terahertz three-dimensional imaging radar for human security screening, the speckle effect affects the detection and recognition performance of hidden contraband seriously. For this reason, effective suppression of terahertz holographic speckle is demanded urgently. By using the angle based degree of freedom for speckle suppression obtained by the target rotation, a terahertz holographic radar speckle suppression method based on multi-look correction of correlation angle was proposed. Meanwhile, the angle sensitivity of the target scattering was carefully considered. In theory, the normalized covariance expression of the holographic radar speckle intensity under the relevant angle illumination was derived, and the speckle contrast after multi-view processing was given. Experimentally, based on the fast speed of the 340 GHz MIMO based imaging system, single-look images of low-speed rotating target were obtained. The imaging space rotation correction, target registration and multi-look processing were performed on each single-look image under the relevant viewing angle. The speckle contrast of the averaged reconstructed image was reduced to 44% of a single reconstructed image. The processed speckle was effectively suppressed with distinct target contour and details. The proposed method can effectively suppress speckle noise and achieve image enhancement without increasing system complexity.

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