【作者】 刘韵；

【导师】 马杰；

【作者基本信息】 华中科技大学 ， 模式识别与智能系统， 2012， 硕士

【摘要】 激光成像雷达使用激光作为发射信号，并且由信号发射、信号接收和回波信号处理三个部分以及使这三个部分协调工作的部件组成。和其他类型的雷达比较，激光成像雷达的测量精度和分辨率都很高，抗干扰的能力非常强。普通雷达可以得到探测目标距离信息，激光成像雷达除此之外还可以得到目标表面反射强度等一些多维信息，并将这些信息进行综合并得到具有多种特征的信息图像。激光成像雷达在地形匹配、航迹规划、飞行器导航等诸多领域有着非常重要的应用价值。本文首先介绍了激光成像雷达的产生和特点，对其发展过程和研究现状做了综述；然后细致的分析了激光成像雷达的扫描成像原理，并接着建立了激光成像雷达的前下视成像仿真几何模型；在此基础上，结合发射脉冲激光波束模型和激光雷达方程，在考虑了地形和大气因素下，给出了目标回波波形的数学表达，建立了完整的激光成像雷达前下视成像仿真模型；接着，对不同地形因素下激光雷达探测性能的改变进行了分析并做了大量实验，发现地表反射率与坡度能够显著影响激光雷达的探测性能；然后，在理论上分析了大气对激光传输的影响，并通过大量实验分析了大气因素对激光雷达探测性能的影响；最后，分析了在不同飞行高度、姿态角、扫描角等载体参数情况下，激光雷达性能受到的影响。实验结果表明，该仿真模型不仅同真实激光成像雷达系统比较符合，而且能很好的表征地形、大气以及激光成像雷达系统的关键参数对激光成像雷达探测能力的影响。更多还原

【Abstract】 Imaging laser radar (Light Detection and Ranging, Lidar) is a novel kind of imagingsensor with high accuracy by combining the laser technology and radar technology, whichhas many advantages such as high angular resolution, high range resolution, highmeasurement accuracy and strong anti-interference capacity. Apart from measuring ranges,some lidars can also record the intensity of the backscattered laser light and othermulti-dimension signal, which can be integrated into multi-characters image. Lidar hastremendous potential applications in terrain matching, terrain following and flyforward-looking obstacle.Lidar system simulation is a combination of laser radar technology and computersimulation technology, is a new means for the design of future laser radar system, and isone of the most important research fields on laser radar system. Integrated, comprehensivesimulation software can facilitate the evaluation, design of laser radar systems, can predictthe assessment and performance of laser radar systems, and can guide the design ofimaging laser radar system.In this paper, we simulate the entire process of lidar in different terrain conditions anddifferent atmospheric conditions to find the contact between them and detectionperformance. We also simulate in different carrier parameters to show how the parametersinfluence the detection performance. The experimental results show that, the model notonly meets the real lidar system well, but also it can show the influence of several keylidar system parameters to imaging laser radar detection capacity well.更多还原