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.