首页> 外文会议>5th International Symposium on Test and Measurement (ISTM/2003) Vol.3 Jun 1-5, 2003 Shenzhen, China >The Design of the Synchronization Control Circuit Based on CPLD for the Range-gated Laser Imaging System
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The Design of the Synchronization Control Circuit Based on CPLD for the Range-gated Laser Imaging System

机译:基于CPLD的测距门激光成像系统同步控制电路设计

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摘要

Some missions such as search and rescue (SAR) and general surveillance must work in low-light-level and low visibility conditions to find and identify targets. Passive night vision systems can't provide sufficient resolution and adequate contrast in low-light-level conditions. Some of the deficiencies can be overcome by the addition of a pulsed laser illuminator synchronized to a gated camera. Range gating can eliminate most of the light backscattered by aerosols and is immune to some extent to blooming effects specific to highly sensitive cameras. The synchronization control technique is one of the most key techniques in the range-gated imaging system. Conventional control circuits are composed of discrete components and Medium Scale Integration (MSI) and Small Scale Integration (SSI), which have bad reliability and poor ability of anti-interference. On the basis of analyzing the performance requirement to the synchronization control of the range-gated imaging system, a new synchronization control circuit based on CPLD is presented. The circuit based on CPLD is very compact and flexible and has high reliability and strong ability of anti-interference. The synchronization control circuit based on CPLD can provide a wide selection of gate widths, pulse widths and delays. The image resolution of range-gated imaging system can be improved by conveniently adjusting the pulse delay and the pulse width.
机译:诸如搜救(SAR)和常规监视之类的某些任务必须在弱光和低能见度条件下工作才能找到并识别目标。被动式夜视系统在弱光条件下无法提供足够的分辨率和足够的对比度。通过添加与门控摄像机同步的脉冲激光照明器,可以克服某些缺陷。测距选通可以消除气溶胶向后散射的大部分光线,并且在某种程度上不受高敏感度相机特有的光晕效应的影响。同步控制技术是测距门成像系统中最关键的技术之一。常规的控制电路由分立元件和中规模集成(MSI)和小规模集成(SSI)组成,可靠性差且抗干扰能力差。在分析测距门成像系统同步控制性能要求的基础上,提出了一种基于CPLD的新型同步控制电路。基于CPLD的电路非常紧凑灵活,可靠性高,抗干扰能力强。基于CPLD的同步控制电路可提供多种门宽,脉冲宽度和延迟选择。通过方便地调整脉冲延迟和脉冲宽度,可以提高距离门成像系统的图像分辨率。

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