红外与激光工程, 2018, 47 (10): 1030001, 网络出版: 2018-11-25
直视合成孔径激光雷达自补偿高速空间波前调制器
Self-compensation high-speed spatial wavefront modulator of down-looking synthetic aperture ladar
摘要
提出了一种直视合成孔径激光雷达的高速空间相位调制方法。将一束空间偏振光束分为两束同轴同心且正交偏振的光束。在交轨向, 将两个光束调制成随时间正弦变化且变化方向相反的空间相位; 在顺轨向, 将两束光调制成具有符号相反曲率半径的相位, 在慢时间轴上产生与目标顺轨向位置有关的空间二次项相位历程。此种调制方法, 在顺轨向具有自动补偿抖动的功能, 可以有效地防止平台抖动对成像的影响。
Abstract
A high-speed phase modulation of down-looking synthetic aperture ladar was proposed. The spatially polarized beam was divided into two coaxial and polarization-orthogonal beams. In the orthogonal direction of travel, the two beams were modulated to sinusoidal phases, whose changing directions were contrary; in the travel direction, these two beams were modulated with different curvatures to a quadratic phase history, which was associated with position of the targets in slow-time axis. This modulation method has the function of automatic jitter compensation in the azimuthal direction, and can effectively prevent the platform jitter effects on imaging.
李光远, 孙建锋, 周煜, 卢智勇, 张国, 许蒙蒙, 张波. 直视合成孔径激光雷达自补偿高速空间波前调制器[J]. 红外与激光工程, 2018, 47(10): 1030001. Li Guangyuan, Sun Jianfeng, Zhou Yu, Lu Zhiyong, Zhang Guo, Xu Mengmeng, Zhang Bo. Self-compensation high-speed spatial wavefront modulator of down-looking synthetic aperture ladar[J]. Infrared and Laser Engineering, 2018, 47(10): 1030001.