时间分辨荧光激光雷达植被遥感监测关键技术方法研究

The remote sensing of vegetation growth status is of great significance. By adopting the remote sensing technology of laser-induced fluorescence, abundant fluorescence spectral information can be acquired for plant condition monitoring, while attaining the three-dimensional detection abilities of LiDAR. However, the detection solely based on fluorescence signals is limited in accuracy and stability to some extent, and fails to fully explore the advantages of fluorescence diagnosis. This project proposes to carry out a research on the time-resolved fluorescence LiDAR, aiming to achieve a more accurate and stable remote sensing of vegetation fluorescence from its generation to its extinction. By researching on the broad spectrum detection of fluorescence echoes and high time-resolved fluorescence detection, the key problems of time-resolved fluorescence spectroscopy optimization in the system design can be resolved. In addition, studies on comprehensive data processing and fluorescence intensity correction methods will be conducted to improve the observation accuracy, and extract the fluorescence lifetime information, which is a more stable fluorescence intrinsic parameter, as an indicator for vegetation growth state monitoring. This project is expected to promote the time-resolved fluorescence LiDAR into a practical terrestrial means, with exciting prospect in vegetation remote sensing, especially in agriculture and forestry monitoring. At the same time, the understanding of the generation and extinction of plant fluorescence will provide important scientific basis for plant photosynthetic active radiation research.

对地表植被的生长状况进行遥感监测意义重大，采用激光诱导荧光遥感探测技术，可以在保留激光雷达三维空间探测能力的同时，获取丰富荧光光谱信息用于植被生长状态监测。但基于单一荧光强度探测，其精度及稳定性在一定程度上会受到限制，同时未能充分挖掘荧光探测的优势。本项目提出发展时间分辨荧光激光雷达，实现对植被荧光由产生到消亡全过程更高精度、更高稳定性地遥感监测。通过荧光回波高效率宽谱段探测及高时间分辨探测研究，攻克系统设计中时间分辨荧光光谱优化探测关键问题。此外，开展综合数据处理与荧光强度校正方法研究提高探测精度，并提取荧光寿命信息这一更稳定的荧光本征参量，作为对植被生长状态监测的指示器。通过本项目研究，有望促进时间分辨荧光激光雷达发展成为一种实用的测地手段，在植被遥感尤其是农林业监测方面具有很好的应用前景，并且可通过对植被荧光产生到消亡过程机理的理解，为植被光合有效辐射研究提供重要科学依据。

对地表植被的生长状况进行遥感监测意义重大，采用激光诱导荧光遥感探测技术，可以在保留激光雷达三维空间探测能力的同时，获取丰富荧光光谱信息用于植被生长状态监测。但基于单一荧光强度探测，其精度及稳定性在一定程度上会受到限制，同时未能充分挖掘荧光探测的优势。本项目旨在开展时间分辨荧光激光雷达演示系统研究，实现对植被荧光由产生到消亡全过程更高精度、更高稳定性地遥感监测。通过荧光回波高效率宽谱段探测及高时间分辨探测研究，攻克系统设计中时间分辨荧光光谱优化探测关键问题。此外，开展综合数据处理与荧光强度校正方法研究提高探测精度，并提取荧光寿命信息这一更稳定的荧光本征参量，在植被生长状态遥感监测中进行了初步应用验证。通过本项目研究，有望促进时间分辨荧光激光雷达发展成为一种实用的测地手段，在植被遥感尤其是农林业监测方面具有很好的应用前景，并且可通过对植被荧光产生到消亡过程机理的理解，为植被光合有效辐射研究提供重要科学依据。