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合成孔径成像激光雷达是一种新的主动式有源成像系统,它的一个突出优势是可以获得比合成孔径雷达更高的分辨率,和更接近光学图片的效果。首先,概述了理想情况下旋转目标成像的基本原理,分析了合成孔径成像激光雷达的二维分辨率。然后,针对合成孔径成像激光雷达实验中遇到的实际问题,即不能实现理想转台,会引入平动使包络相位无法对齐,进而影响成像质量,甚至无法成像,给出包络对齐和初相校正的平动补偿方法。包络对齐利用脉冲之间的相关性进行对齐;初相校正以转台模型的理想转台中心的相位为基准实现相位的对齐。最后,给出实验系统框图、工作模式、实验参数设计和最终成像效果图,对比了包络对齐和初相校正的结果,验证了系统的有效性和平动补偿的必要性。
Synthetic Aperture Imaging Lidar is a new active active imaging system that offers the distinct advantage of being able to obtain higher resolution than synthetic aperture radar and closer to optical images. First of all, the basic principle of rotating target imaging under ideal conditions is summarized and the two-dimensional resolution of synthetic aperture imaging lidar is analyzed. Then, in view of the practical problems encountered in the experiment of synthetic aperture imaging lidar, that is, the ideal turntable can not be realized, the translational phase can not be aligned due to the introduction of translational motion, thereby affecting the imaging quality or even imaging. The envelope alignment and the initial phase Correction of translational compensation method. Envelope alignment uses the correlation between the pulses for alignment; the initial phase alignment aligns the phases based on the phase of the ideal turntable center of the turntable model. Finally, the experimental system block diagram, working mode, experimental parameter design and final imaging renderings are given. The results of envelope alignment and initial phase correction are compared. The validity of the system and the necessity of translation compensation are verified.