合成孔径激光雷达下视三维成像构型及算法

发布时间：2018-04-13 23:18

本文选题：激光雷达 + 合成孔径　；参考：《红外与激光工程》2014年10期

【摘要】：传统激光三维成像均采用实孔径成像技术,其分辨率会随着作用距离的变远而降低。相比于实孔径成像,合成孔径成像的一个显著优势是沿航向的分辨率不随作用距离的变化而变化。基于合成孔径技术提出一种合成孔径激光三维成像雷达的工作模型。该系统采用激光泛光发射模式和多波束相干接收,首先,在高度向,采用大时宽带宽的线性调频信号,并利用解线频调技术实现高分辨率;其次,沿航向利用合成孔径技术频域压缩算法实现高分辨率,其中考虑到激光调频信号的长扫频周期,对于平台连续运动引入的多普勒平移项进行了补偿;在跨航向通过实孔径阵列实现高分辨率。最后,通过仿真实验验证了该系统的有效性。
[Abstract]:Traditional 3D laser imaging uses real aperture imaging technology, and its resolution will decrease with the distance of action.A significant advantage of synthetic aperture imaging over real aperture imaging is that the resolution along the course does not vary with the range of action.Based on synthetic aperture technology, a model of synthetic aperture laser 3D imaging radar is proposed.In this system, laser flooding mode and multi-beam coherent reception are adopted. Firstly, in high direction, the linear frequency modulation (LFM) signal with large time and wide bandwidth is adopted, and the high resolution is realized by using the de-line-frequency modulation technique.The synthetic aperture technique is used to realize high resolution along the course. Considering the long sweep frequency period of the laser frequency modulation signal, the Doppler translation term introduced by the continuous motion of the platform is compensated.High resolution is achieved through real aperture arrays across course.Finally, the effectiveness of the system is verified by simulation experiments.
【作者单位】：西安电子科技大学物理与光电工程学院;西安电子科技大学雷达信号处理国家重点实验室;
【基金】：国家自然科学基金(61107006) 中央高校基本科研业务费资助(K5051305005,NSIY171412)
【分类号】：TN958

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