【作者】 郑恢康；

【导师】 赵卫疆；

【作者基本信息】 哈尔滨工业大学 ， 物理电子学， 2011， 硕士

【摘要】 激光多普勒雷达是目前惟一能提供全球三维风场数据的有效工具。而雷达控制的实现将直接影响系统的性能。由于雷达系统复杂,并且对控制精度、实时性的要求高,这些增加了控制系统的设计难度。另外,由于激光雷达回波信号随距离的衰减快,一般采用光电倍增管(PMT)模拟方式与光子计数方式相结合的探测方法,这样使得数据采集系统都较为复杂,并且也使数据处理的难度增大。鉴频系统直接决定着雷达其他子系统的实现方式。本文从雷达系统的探测方式入手,对激光测风雷达控制系统进行了总体设计。确定以虚拟仪器技术来开发整个控制系统,以一台计算机为控制中心,以Lab VIEW作为开发平台,这样在数据传输和数据处理上大大提高系统的效率。然后利用虚拟仪器技术重点研究并实现了基于角度调谐的双边缘技术的鉴频系统初始工作点的定标,实现控制与数据采集的同步和高效的数据处理,使定标过程在较短的时间内完成,达到了所需的控制精度。另外,本文以硅光电倍增器SiPM作为探测器,以高速数据采集卡作为硬件核心开发雷达数据采集与处理系统过程。对探测器的光子响应特性和暗计数特性进行了研究,以此为依据设计算法来通过软件实现光子计数。这样使得采集系统大大简化,并且提供统一的数据格式以方便后续的风场反演。更多还原

【Abstract】 The doppler wind lidar (DWL) is the only effective tool that can provide a global three-dimensional coverage of wind data. And the control system derectly effects the performance of the DWL. As the complexity of lidar systems, and requirements on the control precision and high real-time , increases the difficulty of the control system. As the laser echo signal decay quickly with distance, commonly used photomultiplier tube (PMT) with photon counting mode analog combination of detection methods, which makes data collection systems are more complex, and also make data processing more difficult.The frequency discrimination directly determines the implementation of other subsystems. This paper from the lidar detection started the overall design of the DWL control system. This paper used the virtual instrument technology to develop the control system,used a computer as the control center, as the Lab VIEW development platform, so that data transmission and data processing greatly improve the efficiency of the system. Then focus on the design of virtual instrument technology to implement the calibration of the inititial operating point of the frequency discriminationsystem based on angle-tuned dual-edge technology, realize the synchronization of the control and data acquisition , the calibration process in a short time to complete,and achieve the required control accuracy.This paper used the virtual instrument technology with SiPM as the detector, and high-speed data acquisition card as hardware core to design the DWL data acquisition and processing system,studied the response characteristics and dark counts characteristics of of the photon detector. As a basis for designing algorithms to achieve photon counting with software This allows the acquisition system greatly simplified, and provide a unified data format to facilitate subsequent wind retrieval.更多还原