太赫兹雷达RCS测量中的分时定标技术
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摘要
太赫兹频段的目标散射特性测量技术是当前太赫兹雷达的重要研究方向,其中系统定标技术决定了雷达散射截面积(RCS)测量结果的准确性。使用基于微波倍频源的太赫兹宽带雷达目标散射特性测量系统,该系统由微波源经倍频后,中心频率达到440 GHz,带宽达25.6 GHz。利用光滑表面金属球为标准体,采用分时定标技术对太赫兹雷达系统进行定标,再对金属材质的战斗机模型和吉普车模型进行近场RCS测量实验,获得以上2种典型人造目标的近场RCS测量结果。测试结果与理论趋势符合良好,证明了太赫兹雷达系统RCS测量中分时定标技术的有效性。
Radar Cross Section(RCS) measurement under the terahertz band is one of the important research directions of terahertz radar. The system calibration technology determines the accuracy of the RCS measurement results. In this paper, RCS measurement system of terahertz wideband radar based on microwave frequency doubling source, the system has a central frequency at 440 GHz and its bandwidth is 25.6 GHz after the frequency doubled. Using a smooth surface metal sphere as the standard body, calibration of terahertz radar system by different times calibration technique, then the near field RCS measurement experiment of the fighter model and the jeep model of metal material are also carried out. Near field RCS measurements of two typical artificial targets have been obtained. The results are in good agreement with the theoretical trends, which proves the effectiveness of the time-sharing calibration technique in RCS measurement in terahertz radar systems.
Radar Cross Section(RCS) measurement under the terahertz band is one of the important research directions of terahertz radar. The system calibration technology determines the accuracy of the RCS measurement results. In this paper, RCS measurement system of terahertz wideband radar based on microwave frequency doubling source, the system has a central frequency at 440 GHz and its bandwidth is 25.6 GHz after the frequency doubled. Using a smooth surface metal sphere as the standard body, calibration of terahertz radar system by different times calibration technique, then the near field RCS measurement experiment of the fighter model and the jeep model of metal material are also carried out. Near field RCS measurements of two typical artificial targets have been obtained. The results are in good agreement with the theoretical trends, which proves the effectiveness of the time-sharing calibration technique in RCS measurement in terahertz radar systems.
引文
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[2]段素青,楚卫东,杨宁,等.太赫兹量子级联激光器有源区增益分析和设计[J].太赫兹科学与电子信息学报,2013,11(1):16-20.(DUAN Suqing,CHU Weidong,YANG Ning,et al.Design of the active region gain of the terahertz quantum cascade lasers[J].Journal of Terahertz Science and Electronic Information Technology,2013,11(1):16-20.)
[3]COULOMBE M J,HORGAN T,WALDMAN J,et al.A 160 GHz polarimetric compact range for scale model RCS measurements[C]//Proceedings of Antenna Measurements&Techniques Association.Seattle,WA:[s.n.],2007:239.
[4]DEMARTINIS G B,COULOMBE M J,HORGAN T M,et al.A 240 GHz polarimetric compact range for scale model RCSmeasurements[Z].Massachusetts University Lowell Submillimeter-wave Technology Laboratory,2010.
[5]COULOMBE M J,HORGAN T,WALDMAN J,et al.A 524 GHz polarimetric compact range[Z].Massachusetts University Lowell Submillimeter-wave Technology Laboratory,1999.
[6]COULOMBE M J,FERDINAND T,HORGAN T,et al.A 585 GHz compact range for scale model RCS measurements[Z].Massachusetts University Submillimetter-wave Technology Laboratory,1993.
[7]DEMARTINIS G B,GOYETTE T M,COULOMBE M J,et al.A 1.56 THz spot scanning radar range for fully polarimetric W-band scale model measurements[Z].Massachusetts University Submillimetter-wave Technology Laboratory,2000.
[8]武亚君,黄欣,徐秀丽,等.太赫兹目标RCS缩比测量技术[J].强激光与粒子束,2013,25(6):1541-1544.(WU Yajun,HUANG Xin,XU Xiuli,et al.Terahertz target RCS reduction measurement technology[J].High Power Laser and Particle Beams,2013,25(6):1541-1544.)
[9]杨洋,姚建铨,张镜水,等.粗糙铜表面对低频太赫兹波的散射实验[J].红外与毫米波学报,2013,32(1):36-39.(YANGYang,YAO Jianquan,ZHANG Jingshui,et al.Scattering experiment of low frequency terahertz waves on rough copper surface[J].Journal of Infrared and Millimeter Waves,2013,32(1):36-39.)
[10]杨洋.太赫兹波在粗糙金属球体目标上的散射特性[J].太赫兹科学与电子信息学报,2014,12(6):783-787.(YANGYang.Scattering properties of terahertz waves on rough metal spherical targets[J].Journal of Terahertz Science and Electronic Information Technology,2014,12(6):783-787.)
[11]杨洋,姚建铨,钟凯.太赫兹雷达散射截面测量中定标体的确定[J].激光与红外,2014(10):1149-1153.(YANG Yang,YAO Jianquan,ZHONG Kai.Determination of calibrator in terahertz radar cross section measurement[J].Laser and Infrared,2014(10):1149-1153.)
[12]李东起,李彦鹏,宋炎,等.太赫兹目标RCS测量误差估计方法及其应用[J].太赫兹科学与电子信息学报,2017,15(5):711-715.(LI Dongqi,LI Yanpeng,SONG Yan,et al.Application of measurement error estimation method for terahertz target’s RCS[J].Journal of Terahertz Science and Electronic Information Technology,2017,15(5):711-715.)
[13]黄培康,殷红成,许小剑.雷达目标特性[M].北京:电子工业出版社,2004.(HUANG Peikang,YIN Hongcheng,XU Xiaojian.Radar target characteristics[M].Beijing:Electronic Industry Press,2004.)