一种220 GHz波段太赫兹合成孔径成像雷达
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摘要
微波频段的机载合成孔径成像雷达在对地观测方面具有广泛应用,但其合成孔径成像积累时间长,成像帧率低,提高雷达工作频率能够减小合成孔径所需转角,提高成像帧率。设计了一种工作在220 GHz波段的太赫兹合成孔径成像雷达系统,采用收发天线分置、发射宽带线性调频连续波的体制,最大信号带宽4.8 GHz,输出信号功率约20 m W。宽带回波信号幅度相位经外标校补偿,通过成像试验,验证了太赫兹ISAR与SAR成像分辨率约3.2 cm,可实现5Hz的成像帧率,证明太赫兹波段能够大幅提升成像帧率,满足快速成像的要求。
Airborne synthetic aperture imaging radar in microwave band is widely used in earth observation,however,its synthetic aperture imaging has long accumulation time and low imaging frame rate. Increasing operating frequency of the radar can reduce the required angle of the synthetic aperture and increase the imaging frame rate. A terahertz synthetic aperture imaging radar based on 220 GHz band is presented. The receiving and transmitting antennas are separated. The system uses a linear frequency-modulated continuous-wave( LFMCW) waveform. The output terahertz signal power is about 20 m W and a 4.8 GHz instantaneous bandwidth signal is achieved. The experiments verify that the resolution of terahertz ISAR and SAR imaging is about 3.2 cm,and the imaging frame rate of 5 Hz can be achieved. It is proved that terahertz band can greatly increase the imaging frame rate and meet the requirements of fast imaging.
Airborne synthetic aperture imaging radar in microwave band is widely used in earth observation,however,its synthetic aperture imaging has long accumulation time and low imaging frame rate. Increasing operating frequency of the radar can reduce the required angle of the synthetic aperture and increase the imaging frame rate. A terahertz synthetic aperture imaging radar based on 220 GHz band is presented. The receiving and transmitting antennas are separated. The system uses a linear frequency-modulated continuous-wave( LFMCW) waveform. The output terahertz signal power is about 20 m W and a 4.8 GHz instantaneous bandwidth signal is achieved. The experiments verify that the resolution of terahertz ISAR and SAR imaging is about 3.2 cm,and the imaging frame rate of 5 Hz can be achieved. It is proved that terahertz band can greatly increase the imaging frame rate and meet the requirements of fast imaging.
引文
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[2]李大圣,邓楚强,刘振华,孙俊,金林.太赫兹成像雷达系统研究进展[J].微波学报,2015,31(6):82-87Li D S,Deng C Q,Liu Z H,Sun J,Jin L.Research progress of THz imaging radar system[J].Journal of Microwaves,2015,31(6):82-87
[3]DARPA Broad Agency Announcement.Video synthetic aperture radar(Vi SAR)[OL].System Design and Development,Strategic Technology Office,DARPA-BAA-13-06,https://govtribe.com/project,Dec.19,2012
[4]Wallace H B,Gorman J,Maloney R P.Video synthetic aperture radar(Vi SAR):The quest for all-weather,high-resolution FMV[A].Full Motion Video Symposium[C],American Institute of Engineers,2013
[5]Wallace H B.Development of a video SAR for FMV through clouds[A].Open Architecture/Open Business Model Net-Centric Systems and Defense Transformation[C],Baltimore,Maryland,United States,2015.94790L1-2
[6]Kim S H,Fan Ryan,Dominski Fred.Vi SAR:A 235GHz radar for airborne applications[A].2018 IEEE Radar Conference[C],2018.2375-5318
[7]Armstrong C M,Kowalczyk R.A compact extremely high frequency MPM power amplifier[J].IEEE Trans on Electron Devices,2017,65(6):2183-2188
[8]保铮,邢孟道,王彤.雷达成像技术[M].北京:电子工业出版社,2004Bao Z,Xing M D,Wang T.Radar imaging technology[M].Beijing:Publishing House of Electronics Industry,2004
[9]Appleby R,Wallace H B.Standoff detection of weapons and contraband in the 100 GHz to 1 THz region[J].IEEE Trans.Antennas and Propagation,2007,55(11):2944-2956
[10]胡建民,王岩飞,李和平.基于回波数据的超高分辨率SAR通道相位误差估计与补偿[J].电子与信息学报,2012,34(7):1602-1608Hu J M,Wang Y F,Li H P.Channel phase error estimation and compensation for ultra-high resolution SAR based on echo data[J].Journal of Electronics&Information Technology,2012,34(7):1602-1608
[11]Cheng B B,Jiang G,Yang C,et al.Signal processing for0.14THz high resolution imaging radar[J].High Power Laser Particle Beams,2013,25(6):1577-1581
[12]张群英,江兆凤,李超,等.太赫兹合成孔径雷达成像运动补偿算法[J].电子与信息学报,2017,39(1):129-137Zhang Q Y,Jiang Z F,Li C,et al.Motion compensation imaging algorithm of terahertz synthetic aperture radar[J].Journal of Electronics&Information Technology,2017,39(1):129-137
[13]Zhang Y,Sun J P,Lei P.SAR-based paired echo focusing and suppression of vibrating targets[J].IEEE Trans.Geoscience&Remote Sensing,2014,52(12):7593-7605