摘要
在太赫兹成像中,阵列的稀疏化设计会引起栅旁瓣的恶化。在传统相干因子(Coherence Factor,CF)加权的基础上设计了适用于多输入多输出(Multiple-Input Multiple-Output,MIMO)稀疏成像阵列的相位相干因子(Phase Coherence Factor,PCF)和符号相干因子(Sign Coherence Factor,SCF)两种加权栅旁瓣抑制方法。对点目标仿真结果表明,CF、PCF和SCF栅旁瓣抑制后峰值旁瓣比(Peak Side Lobe Ratio,PSLR)分别降低了17.81 dB、24.56 dB和22.74 dB,在340GHz 4T16R稀疏阵列成像系统中的实测结果也表明,PCF和SCF对栅旁瓣的抑制效果分别优于CF 6dB和4dB以上。
In terahertz imaging,the sparse design of the array can cause degradation of the gratinglobes.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.
作者
宋叶江
崔振茂
安健飞
喻洋
成彬彬
SONG Ye-Jiang;CUI Zhen-Mao;AN Jian-Fei;YU Yang;CHENG Bin-Bin(Institute of Electronics Engineering,China Academy of Engineering Physics,Mianyang 621999,China;Microsystem and Terahertz Research Center,China Academy of Engineering Physics,Chengdu 610200,China)
出处
《红外与毫米波学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第4期434-440,共7页
Journal of Infrared and Millimeter Waves
基金
国防基础科研计划(JCKY2017212C002)
国家重点研发计划(2018YFB180005)
中国工程物理研究院院长基金(YZJJLX2018009)
国家重点基础研究发展计划(973计划)(2015CB755406)。
关键词
相干因子
栅旁瓣抑制
太赫兹成像
MIMO稀疏阵列
coherence factor
grating lobes suppression
terahertz imaging
MIMO sparse array imaging