基于532nm激光目标回波脉冲宽度的成像实验研究  

Imaging Experimental Study Based on the Width of 532 nm-Laser Target Echo Pulse

作　　者：周鑫[1] 孙剑峰[1] 姜鹏[2] 熊卫华[1] 王骐[1] 

机构地区：[1]哈尔滨工业大学光电子技术研究所可调谐(气体)激光技术国家级重点实验室,黑龙江哈尔滨150001 [2]北京机电工程研究所,北京100074

出　　处：《光学学报》2015年第A01期139-144,共6页Acta Optica Sinica

摘　　要：激光主动成像雷达在宽景深复杂场景目标成像探测过程中，由于远距离目标回波信号幅度较小，导致在强度像上缺失，影响了目标探测识别率。针对此问题，提出通过检测激光回波脉冲宽度生成激光二维平面像，即脉宽像，使用脉宽像完成宽景深远距离目标检测。利用条纹管激光成像雷达对复杂场景建筑物群进行推扫成像实验，分别获得了强度像、距离像和脉宽像。对脉宽像进行数据统计分析，结果表明，脉宽像的视觉效果优于强度像，相对于强度像，可将远场目标清晰呈现；不同的建筑物，其回波脉宽平均值不同；且光束入射角、目标的材质与回波脉宽密切相关：不同入射角的两个白色墙壁，其回波脉宽相差为2，玻璃与粉色的墙回波脉宽相差为4．7；而目标颜色（白色、粉色）对532nm回波脉宽影响较小，回波脉宽相差仅为0．2。证明脉宽像可有效提高宽景深远距离目标探测率。Laser active imaging radar over a wide depth of field and complex-scene target imaging process, because the remote target echo-signal amplitude is smaller, resulting in a lack of effect on the intensity image, and affecting the target detection and recognition rate. Aiming at this problem, the detection of laser echo pulse width to generate laser two-dimensional image is put forward, which is called the pulse-width image, and the pulse-width image is used to detect the wide depth of field and far-reaching distance target. Using the streak tube laser imaging radar scan imaging experiments on multiple building group, the intensity image, range image and pulse-width image are obtained respectively. Analysing by statistical data, the results show that the visual effect of the pulse-width image is better than the intensity image, relative to the intensity image, the pulse-width image can clearly show the far-field targets~ for different buildings, the average value of echo pulse width are different, and the beam incident angle, target material is closely related with the echo pulse width： white walls of two different-incident angles, the echo pulse-width difference is 2, the pulse-width of glass and the pink wall differ by 4.7, while the target color （white, pink） has little effect on the 532nm echo pulse width, the difference of pulse width is only 0.2. It proves that the pulse-width image can effectively improve the wide depth of field and far-reaching distance target detection rate.

关 键 词：成像系统 激光成像雷达 激光回波 脉冲宽度 脉宽像 

分 类 号：TN29[电子电信—物理电子学]