论文部分内容阅读
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。
Conventional laser three-dimensional imaging using real aperture imaging technology, the resolution will decrease as the distance away. A significant advantage of synthetic aperture imaging over real aperture imaging is that the resolution along the heading does not vary with distance of action. Based on the synthetic aperture technology, a working model of synthetic aperture laser three-dimensional imaging radar is proposed. The system uses the laser floodlight emission mode and multi-beam coherent reception. Firstly, it uses high-frequency wideband chirp signals at high altitude and high resolution by using the demodulation technique. Secondly, using the synthetic aperture technique The frequency domain compression algorithm achieves high resolution, which takes into account the long sweep period of the laser FM signal, compensates the Doppler shift term introduced by the continuous motion of the platform and achieves high resolution across the real aperture array across the flight. Finally, the effectiveness of the system is verified by simulation experiments.