制冷红外与微光融合侦察技术—超长作用距离微光成像系统

发布时间：2018-06-20 15:41

本文选题：激光距离选通 + 微光成像　；参考：《北京理工大学》2015年硕士论文

【摘要】：文针对主动夜视成像系统,提出了采用激光距离选通的技术实现对5km处的中型汽车等典型目标成像的超远作用距离微光成像系统的设计。系统地论述了激光距离选通成像技术的结构、工作原理、工作性能以及关键点。激光距离选通技术采用红外激光作为辅助照明源,照明目标物体,利用同步控制技术控制激光脉冲的发射和摄像机选通门的开闭,从而实现距离选通,减少了被探测到的可能,并且有效抑制后向散射现象,同时采用像增强器显著提高系统的作用距离,实现了在低照度环境下对远距离目标的探测。本论文以激光距离选通技术为基础,建立了基于信噪比的距离模型,给出了主动成像的视距估算方法,并通过对视距的估算以及系统的性能计算出系统所需的激光器的功率以及所发出的的激光的光强,并且设计了基于FPGA的同步控制电路,得到脉宽和系统重复频率可调的脉冲时序,精度可达到ns级。另外,本文还设计了像增强器的高压供电部分和基于MOSFET的高压脉冲开关电路。通过本文的设计为开发具有实际应用功能的超远作用距离成像系统打下了坚实的基础。
[Abstract]:Aiming at the active night vision imaging system, this paper presents the design of ultra-long range LLL imaging system for typical targets such as medium vehicles at 5km using laser range-gating technology. The structure, working principle, working performance and key points of laser range-gated imaging technology are discussed systematically. The laser range gating technology uses infrared laser as the auxiliary illumination source, illuminates the target object, uses the synchronous control technology to control the laser pulse emission and the camera gate opening and closing, thus realizes the distance gating, reduces the possibility of being detected. The backscattering phenomenon is effectively suppressed and the image intensifier is used to increase the operating range of the system so as to realize the detection of long range targets in low illuminance environment. Based on the laser range-gating technology, a range model based on SNR is established in this paper, and a method for estimating the visual range of active imaging is presented. The power of the laser and the intensity of the laser are calculated by estimating the range of sight and the performance of the system, and the synchronous control circuit based on FPGA is designed. Pulse timing with adjustable pulse width and repetition rate is obtained, and the accuracy can reach ns level. In addition, the high voltage power supply part of image intensifier and the high voltage pulse switch circuit based on MOSFET are designed. The design of this paper lays a solid foundation for the development of ultra-long range imaging system with practical application function.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP391.41;TN249

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