Target-distance and intensity information detecting with high precision in laser imaging system
-
摘要: 为提高脉冲激光3D成像系统中提取目标距离和强度信息的精度，对时刻鉴别和峰值保持电路进行了深入研究。在简要分析激光测距体制及探测器选择的基础上，给出了激光3D成像系统结构框图：激光器输出信号经半反半透棱镜，反射光线触发参考APD作为计时起始信号，以提高计时基准。给出了恒定阈值鉴别与恒比定时鉴别相结合的时刻鉴别电路，在提高时刻鉴别精度的同时可有效消除噪声对电路的影响。峰值保持选取基于OPA861的跨导型峰值保持电路。在实验室搭建了回波信号模拟系统，并在此基础上对电路性能进行测试。最后，给出了实验结果。结果显示：时刻鉴别电路精度优于1 ns；当输入窄脉冲峰值信号低于800 mV时，峰值保持电路保持精度优于2.63%。整个结果满足后续实验要求。Abstract: In order to enhance the precision of target distance and intensity information in pulse laser 3D imaging system, the time-discriminating circuit and peak holding circuit were studied in detail. Based on analyzing the laser distance-detecting method and the selection of detector, the principle diagram of pulse laser 3D imaging system was given. In this system, pulse from laser was sent to transflective prism, and the reflected light triggered reference APD. Output signal from the reference APD was selected as starting signal for timing to enhance timing basic. Constant threshold discriminator and constant fraction discriminator were combined to form the timing discriminator. In this method, high precision of timing discriminator could be achieved while eliminating the effect of noise to the circuit. The transconductance circuit based on OPA861 was selected to hold the peak signal. The APD signal simulating system was constructed in laboratory, and performance of those circuits were tested. At l ast, testing result was given. Result shows that the precision of time discriminating circuit is better than 1 ns and the precision of peak holding circuit is better than 2.63% when the peak value of narrow pulse signal is less than 800 mV. The result can satisfy the requirement of latter experiment.
-
Key words:
- laser imaging system /
- timing discriminator /
- peak holding /
- distance /
- intensity
-
[1] [2] Yang Yi, Ding Quanxin, Zhang Chunfeng. New advances in airborne laser imaging techniques[J]. Infrared and Laser Engineering, 2011, 40(4): 620-625. (in Chinese) [3] [4] Li Jianzhong, Peng Qixian, Li Zeren, et al. Technology of missile-borne laser active imaging guidance[J]. Infrared and Laser Engineering, 2014, 43(4): 1117-1123. (in Chinese) [5] [6] Joāo Pereira do Carmo. Imaging LIDAR technology developments at the European Space Agency [C]//SPIE, 2011, 8001:800129. [7] Shi Zhiyong, Pan Xiaosheng, Zhang Qian. High-precision pulsed laser measuring distance by time delay method[J]. Opt Precision Eng, 2014, 22(2): 252-258. (in Chinese) [8] [9] [10] Sun Jianfeng, Gao Jian, Wei Jingsong, et al. Research development of under-water detect imaging based on streak tube imaging lidar[J]. Infrared and Laser Engineering, 2010, 39(5): 811-815. (in Chinese) [11] Guo Yulan, Wan Jianwei, Lu Min, et al. Three dimensional orientation estimation for laser target [J]. Opt Precision Eng, 2012, 20(4): 843-850. (in Chinese) [12] [13] Yang Ran, Zhang Gaofei, Zhang Zichen, et al. Design and experiment of a laser ranging scheme for aerospace applications[J]. Infrared and Laser Engineering, 2014, 43(3): 700-706. (in Chinese) [14] [15] [16] Zhao Jianchuan, Wang Dinan, Chen Changqing, et al. Infrared laser active imaging and recognition technology[J]. Chinese Optics, 2013, 6(5): 795-802. (in Chinese) [17] [18] Wang Canjin, Sun Tao, Shi Ningning, et al. Laser active imaging and recognition system based on double hidden layer BP algorithm[J]. Opt Precision Eng, 2014, 22(6): 1639-1647. (in Chinese) [19] [20] Zhang Qingyuan, Li Li, Li Quanxi, et al. Comprehensive information processing system of helicopter anticollision laser radar[J]. Chinese Optics, 2013, 6(1): 80-87. (in Chinese) [21] [22] Ping Yuan, Rengarajan Sudharsanan, Bai Xiaogang, et al. 3232 Geiger-mode LADAR cameras[C]//SPIE, 2010, 7684: 76840C. [23] [24] Wang Fei. Research progress in focal plane array for real-time laser three dimensional imaging [J]. Chinese Optics, 2013, 6(3): 297-305. (in Chinese) [25] [26] Hu Chunsheng. Investigation into the high-speed pulsed laser diode 3D-imaging ladar[D]. Changsha: National University of Defense Technology, 2005. (in Chinese) [27] Liu Huabai, Wang Xingshu, Chen Zhuo. Design of transconductance peak holding circuit for fast narrow pulse[J]. Optical Technical, 2008, 34(S): 233-235. (in Chinese) -
点击查看大图
计量
- 文章访问数: 873
- HTML全文浏览量: 89
- PDF下载量: 317
- 被引次数: 0
下载:
