强激光与粒子束, 2013, 25 (6): 1577, 网络出版: 2013-04-23
0.14 THz高分辨力成像雷达信号处理
High Power Laser and Particle Beams, 2012, 24(1):7-9)Signal processing for 0.14 THz high resolution imaging radar
太赫兹雷达 高分辨力 逆合成孔径雷达成像 非线性补偿 terahertz radar high resolution inverse synthetic aperture radar imaging nonlinearity compensation
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 cm×3 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。
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.
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. Cheng Binbin, Jiang Ge, Yang Chen, Cai Yingwu. High Power Laser and Particle Beams, 2012, 24(1):7-9)Signal processing for 0.14 THz high resolution imaging radar[J]. High Power Laser and Particle Beams, 2013, 25(6): 1577.
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