激光回波波形分析小目标检测成像方法

Small target imaging method based on the laser echo waveform analysis

通过信息处理提高激光成像对目标信息的感知和获取能力是该领域重要的研究方向。现有激光成像系统的分辨率上限取决于目标处成像光斑的大小,在仅利用回波时延和强度信息的前提下,光斑内小目标回波信号被背景目标信号所掩盖,难以有效实现对小目标的信息提取与检测成像。通过建立激光成像回波信号模型,构建了激光回波分解和子目标信号提取算法,可以有效恢复出激光回波信号中被掩盖的小目标回波信息,从而实现对光斑内小目标检测成像,提高激光成像的信息获取能力。对真实数据的实例分析验证了该方法的有效性。

The information processing is used to improve the capability of laser imaging for apperception and acquirement of target information,which is regarded as the key research direction in the field.The resolving power of laser imaging system is limited by the laser footprint size on the target. Employing only echo delay and intensity information, the echo signals of the small target inside the footprint may be submerged by target signal of background, and it is difficult to achieve information abstraction and detection imaging for the small targets.Based on building the laser imaging echo signal model of the target inside the footprint, the laser echo decomposition and sub-target signal abstraction algorithm were provided to recover the submerged echo information of small targets. Furthermore, detection and imaging of small targets inside the laser footprint was achieved,and the capability of information acquirement of laser imaging was improved. Finally, the example analysis on real data verifies the validity of the algorithm.