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0.14 THz高分辨力成像雷达信号处理
引用本文:成彬彬,江舸,杨陈,蔡英武.0.14 THz高分辨力成像雷达信号处理[J].强激光与粒子束,2013,25(6):1577-1581.
作者姓名:成彬彬  江舸  杨陈  蔡英武
作者单位:1.中国工程物理研究院 电子工程研究所, 四川 绵阳 621 900;
摘    要:为适应0.14 THz超高分辨雷达实时成像的需求,开发了基于CPU+GPU+FPGA的硬件架构和成像处理算法,算法以距离-多普勒为原型,引入L类维格纳分布变换提高横向分辨力,用Keystone变换方法对越距离单元徙动进行校正,并开发了系统非线性补偿算法。在载频0.14 THz、带宽5 GHz雷达样机上进行了逆合成孔径雷达成像试验,获得了3 cm3 cm的成像分辨力和实时成像能力,验证了信号处理方法的有效性。

关 键 词:太赫兹雷达    高分辨力    逆合成孔径雷达成像    非线性补偿
收稿时间:2012-07-15;

Signal processing for 0.14 THz high resolution imaging radar
Cheng Binbin,Jiang Ge,Yang Chen,Cai Yingwu.Signal processing for 0.14 THz high resolution imaging radar[J].High Power Laser and Particle Beams,2013,25(6):1577-1581.
Authors:Cheng Binbin  Jiang Ge  Yang Chen  Cai Yingwu
Institution:1.Institute of Electronic Engineering,China Academy of Engineering Physics,Mianyang 621900,China;2.Terahertz Research Center,China Academy of Engineering Physics,Mianyang 621900,China
Abstract:A real-time signal processing system was designed for the 0.14 THz high resolution imaging radar. The hardware structure was established using CPU+GPU+FPGA to enhance its operation ability. In this inverse synthetic aperture radar (ISAR), the range-Doppler algorithm is used to get higher imaging speed, and L-class Wigner-Ville distribution (LWVD) is adopted to improve the cross-range resolution. An algorithm called Keystone transformation is used to dispose the time domain signal by de-chirp processing, and it eliminates the migration through resolution cell (MTRC) in the target imaging. A method of chirp nonlinearity compensation for the imaging system was also proposed. This signal processing module was applied to a terahertz radar system with 0.14 THz carrier frequency and 5 GHz bandwidth. ISAR images were obtained by using this THz radar system with 3 cm resolution in both range and cross-range profiles, showing the validity of the signal processing method.
Keywords:high resolution  inverse synthetic aperture radar imaging  nonlinearity compensation
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