本振增强直视合成孔径激光成像雷达(SAIL)发射两束同轴且偏振正交的光束,采用外差接收方式接收回波信号,在数据处理过程中对两束偏振正交回波光束携带的目标信号自差,以达到消除大气扰动、运动平台振动和雷达系统本身产生的相位扰动的目的。对该雷达系统的二维成像实验装置进行了描述,并给出了该雷达系统对二维目标成像的信号获取过程和数据处理过程。实验实现了3.6 mm×3.6 mm的分辨率,并对两个二维点阵目标进行成像,取得了良好的成像对比度,证明了该雷达对二维目标成像的可行性。

Enhanced self-heterodyne synthetic aperture imaging ladar (SAIL) with a transmitter of two coaxial polarization-orthogonal beams, uses heterodyne receiver to receive echo signal, self-heterodynes the two polarization-orthogonal echo signals during signal processing to eliminate the phase error generated by atmospheric turbulence, mechanical trembling and ladar system. A laboratory demonstration of enhanced self-heterodyne SAIL for two-dimensional (2D) target is proposed, the data collection and the image processing of this demonstration is mathematically detailed, and its imaging experiments for 2D target are also presented. The achieved imaging resolutions are 3.6 mm×3.6 mm, and two point-array targets are also reconstructed with high contrast. The experimental results prove that the enhanced self-heterodyne SAIL is feasible for 2D imaging.