星载积分路径差分吸收(IPDA)激光雷达测量大气CO2浓度仿真研究
文献类型：学位论文
| 作者 | 谢杨易 |
| 学位类别 | 硕士 |
| 答辩日期 | 2013 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 陈卫标 刘继桥 |
| 关键词 | 遥感 二氧化碳浓度 积分路径差分吸收 星载激光雷达 测量误差 |
| 其他题名 | Simulation for a Space-borne IPDA Lidar Measuring Atmospheric CO2 Concentrations |
| 中文摘要 | 全球CO2浓度的高精度时空分布测量，对于增强对全球碳循环的理解，改善气候预报模型，提高灾害性天气（如干旱和洪水）预报准确率和环境研究等方面具有十分重要的意义。星载积分路径差分吸收(IPDA)激光雷达以卫星作为平台，可在全球范围内进行全天时测量；采用差分吸收方法，基本不受气溶胶和薄云层干扰，具有测量精度高的优点。星载IPDA激光雷达是实现大气CO2浓度高精度时空分布测量的有效方法。 本论文研究了星载IPDA激光雷达系统中两大类主要误差——随机误差和系统误差的产生原因和误差传递关系，建立了各误差项的仿真模型，并针对测量CO2浓度精度1ppm的指标要求，对误差进行分配，为激光雷达系统各部分提出合理的参数指标。优化了激光雷达工作波长，以使与激光雷达工作波长密切相关的几种误差达到最小。 第一章阐明了星载IPDA激光雷达测CO2浓度课题的背景和意义，介绍了国内外对于星载IPDA激光雷达的研究情况。 第二章分析了CO2分子光谱理论和星载IPDA激光雷达测量CO2浓度的原理，研究了吸收截面，光学厚度和平均浓度等重要参量及其计算方法。 第三章阐述了星载IPDA激光雷达测CO2浓度中的两大类误差——随机误差和系统误差，利用误差传递关系建立了误差仿真模型。对误差进行分配，为激光雷达系统各部分提出了合理的参数指标要求。对星载IPDA激光雷达的研究提供了理论依据参考。 第四章开展了星载IPDA激光雷达工作波长优化研究，使与激光雷达工作波长密切相关的几项误差——随机误差、温度不确定性误差、频率不确定性误差以及水汽干扰误差达到最小，以提高激光雷达系统测量CO2浓度的精度。最终优化的工作波长On-line 为6361.2250 cm-1，Off-line为6360.99cm-1。 第五章设计了星载IPDA激光雷达测量CO2浓度仿真软件，集成了各仿真功能子模块，并开发了友好的人机交互界面。 第六章研究了星载IPDA激光雷达激光器发射脉冲功率测量方法。利用电荷积分方法，实现了高速窄脉冲的高精度测量，测量精度满足5*10-4相对精度要求。 |
| 英文摘要 | Global CO2 concentrations high precision measurements are important for strengthening the understanding on global carbon cycle, improving the climate forecast model, enhancing the forecast accuracy for extreme weather and environment studies. Space-borne integrated path differential absorption Lidar(IPDA) is acted as a effective tool to measure global CO2 distribution. . Based on optical differential absorption method ,it is insensitive to atmospheric aerosols and clouds ,so it is proven to show high precision. Two main errors which are relative random error and relative system error in space-borne IPDA Lidar system are studied, and the errors simulation models are built. Besides,based on the ultimate requirement of CO2 concentration measurement precision of 1ppm, different errors are balanced, which is important for lidar system design. In addition, the operating wavelengths of space-borne Lidar are optimized, to minimize measurement error. In chapter 1, the background and development of CO2 concentrations measurement by space-borne IPDA Lidar are presented. In chapter 2, the theories of CO2 molecule spectrum and CO2 concentration measurement by space-borne Lidar are analyzed. Several important parameters and calculation methods are studied, such as absorption cross section, optical depth and column concentration. In chapter 3, the major errors of relative random error and relative system error in space-borne IPDA Lidar system are studied, and the errors formulas are analyzed and modled. Considering 1ppm CO2 concentration measurement requirement, we make a trade-off for different errors. In chapter 4, the operation wavelengths of space-borne IPDA Lidar are optimized to minimize several errors related to CO2 concentrations retrieval, such as relative random error, temperature uncertainty, frequency uncertainty and H2O interference error, Finally, the optimal wavelengths are 6361.2250cm-1 for on-line laser and 6360.99cm-1 for off-line laser. In chapter 5, the simulation software for space-borne IPDA Lidar measuring CO2 concentration is developed, which integrates the simulation sub modules with friendly interface. In chapter 6, the measurement methods and techniques to monitor the emitting pulse laser power of space-borne Lidar laser are studied. Besides, the measurement circuit for ns pulse with high precision is realized with the charge integration method, and the precision is proven to meet the demand of 5*10-4 for laser pulse power. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16743]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 谢杨易. 星载积分路径差分吸收(IPDA)激光雷达测量大气CO2浓度仿真研究[D]. 中国科学院上海光学精密机械研究所. 2013. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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