合成孔径激光成像雷达(Ⅱ):空间相位偏置发射望远镜

Synthetic-Aperture Ladar(Ⅱ):Spatial Phase Biased Telescope for Transmitting Antenna

报道一种可以进行空间相位偏置的光学望远镜,用作合成孔径激光成像雷达中的光学发射天线。在望远镜内放置相位调制平板,控制望远镜的离焦量和位相调制平板的相位函数,能够在激光望远镜的照明区产生可控制的附加空间相位二次项,灵活改变激光照明波前,以在目标回波接收信号中产生雷达运动方向上的所需的二次项相位历程,因此能够实现特定的方位向成像分辨率。

A kind of phase-biased telescope used as the laser transmitting antenna for a synthetic-aperture laser imaging radar is reported.An additional quadratic phase can be produced onto the wavefront of laser illumination by using a spatial phase plate together with a defocusing in the telescope.Such an arrangement is flexible to generate a quadratic phase history necessary for the synthetic-aperture imaging along the azimuth-direction,particularly a phase history for a required imaging resolution.