逆合成孔径成像激光雷达实包络成像算法

Real Envelope Imaging Algorithm for Inverse Synthetic Aperture Imaging Lidar

逆合成孔径激光成像雷达受激光调制技术以及回波相位信息易受大气湍流破坏的限制,采用常规的相位相干积累类方法得到目标二维高分辨图像很困难.针对这一情况,提出了一种基于逆Radon变换的实包络成像算法.利用回波距离脉冲压缩后的实包络信息,实现方位向的非相干积累,最终得到二维高分辨图像.通过该算法,成像系统可以使用非相干激光信号,在脉冲重复频率较低且存在大气湍流的情况下,也可以获得高质量的成像结果.仿真实验验证了此算法的有效性和优越性.

Limited by laser modulation technology and the phase information that is easily damaged by atmospheric turbulence,it is difficult to obtain the 2-D high-resolution image using traditional coherent integration algorithms for Inverse Synthetic Aperture Imaging Lidar（ISAIL）.To solve this problem,a real envelope imaging algorithm was proposed based on inverse Radon transform.Using the proposed method,the ISAIL system can transmit noncoherent laser pulses and high-quality image can also be obtained under the condition of atmospheric turbulence with low pulse repetition frequency.The ISAIL imaging experiment with numerical data validates the feasibility and effectiveness of the proposed method.