激光雷达信号相位误差对合成孔径成像的影响和校正  

Impact and correction of phase error in ladar signal on synthetic aperture imaging

作　　者：胡烜[1,2] 李道京 田鹤[1,2] 赵绪锋[1,2] Hu Xuan;Li Daojing;Tian He;Zhao Xufeng(Science and Technology on Microwave Imaging Laboratory,Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院电子学研究所微波成像技术重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《红外与激光工程》2018年第3期66-77,共12页Infrared and Laser Engineering

基　　金：国家自然科学基金(61771449)

摘　　要：针对合成孔径激光雷达(Synthetic Aperture Ladar,SAL),分析了信号相位误差对合成孔径成像的影响。建立了激光信号模型,分析了激光信号相干性对SAL方位分辨率的影响,给出通过本振信号延时处理保证相干性的解决方案。分析了LFM信号非线性失真对距离分辨率的影响,为同时解决激光LFM信号调制放大过程引入的脉冲间随机初相位问题,提出一种基于参考通道的LFM信号非线性失真和脉冲间随机初相位定标校正方法。给出了实验和仿真数据处理结果。Specific to synthetic aperture ladar(SAL),the impact of signal phase error on synthetic aperture imaging was analyzed.Laser signal was modeled,the impact of laser signal coherence on SAL azimuthal resolution was analyzed,one solution by delaying the local oscillator signal was proposed.The impact of nonlinear distortion in LFM signal on range resolution was analyzed.To solve the problem of the random initial phase error introduced in the process of laser LFM signal modulation and amplification,one nonlinear distortion and phase error calibration correction method based on reference channel was proposed.Experiment and simulation results are shown.

关 键 词：信号相干性 相位误差 合成孔径成像 激光雷达 非线性失真 定标校正 

分 类 号：TN958.98[电子电信—信号与信息处理]