Grating-lobes suppression methods based on coherence factor for terahertz sparse array
投稿时间:2019-07-25  修订日期:2020-04-07  download
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宋叶江 中国工程物理研究院电子工程研究所 
崔振茂 中国工程物理研究院电子工程研究所  
安健飞 中国工程物理研究院电子工程研究所  
喻洋 中国工程物理研究院电子工程研究所  
成彬彬 中国工程物理研究院电子工程研究所 
Abstract:In terahertz imaging, the sparse design of the array can cause degradation of the grating-lobes. In this paper, based on the traditional coherence factor(CF) weighting method, phase coherence factor(PCF) and sign coherence factor(SCF) are designed, which are applied to multi-input and multi-output(MIMO) terahertz sparse array imaging grating-lobes suppression. The simulation results of the point target show that the peak side lobe ratio(PSLR) is reduced by 17.81 dB, 24.56 dB and 22.74 dB after grating lobes suppressed by CF, PCF and SCF, respectively. The results measured in the 340 GHz 4T16R sparse array imaging system also show that the suppression effect of PCF and SCF on grating lobes is 6dB and 4dB better than CF, respectively.
keywords:coherence factor  grating lobes suppression  terahertz imaging  MIMO sparse array imaging
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Copyright:《Journal of Infrared And Millimeter Waves》