中国激光, 2019, 46 (8): 0810001, 网络出版: 2019-08-13
LEO-LEO红外激光掩星CO2浓度测量技术研究 下载: 1014次
LEO-LEO Infrared Laser Occultation Technique to Measure Atmospheric Carbon Dioxide Concentration
遥感 红外激光掩星 主动探测 二氧化碳浓度廓线 性能仿真 remote sensing infrared laser occultation active detection carbon dioxide concentration profile performance simulation
摘要
利用基于近地轨道(LEO)卫星组网的红外激光掩星(LIO)技术,可对地球大气温室气体垂直廓线进行主动探测,为全球温室气体浓度廓线的测量提供新手段。介绍了基于LIO技术的大气温室气体浓度廓线的测量原理,针对最主要的温室气体CO2建立了LIO信号链路模型,通过仿真分析了工作波数对CO2探测精度的影响,并基于误差最小的仿真结果对CO2探测波数进行优化选择。采用所选波数对LIO技术的探测性能进行分析,最终得到可用于CO2浓度廓线探测的波数为4771.6215 cm
-1和4772.0240 cm
-1。在5~35 km高度的有效探测范围内,实现了0.6~1.4 km的垂直分辨率,CO2浓度探测的相对随机误差小于0.8%,最小相对随机误差(0.229%)出现在10 km处。研究结果为星载LIO大气探测系统原理样机的设计提供了重要参考。
Abstract
The infrared laser occultation (LIO) technique based on the low earth orbit satellite network can perform an active detection for vertical profiles of greenhouse gases in the earth's atmospheric, thereby providing a new method for global greenhouse gas concentration profile measurement. In this paper, the principle of the concentration profile measurement of the LIO technique is introduced. The influence of the operation wavelength on the detection accuracy of the most important greenhouse gas CO2 is simulated by establishing the LIO signal link model. Subsequently, the detection wavelengths for CO2 are optimized based on the simulation results with the minimum error. Additionally, the detection performance of the LIO technique is analyzed using the selected wavelengths. Finally, the wavenumbers of 4771.6215 cm
-1 and 4772.0240 cm
-1 available for the CO2 concentration profile detection are selected. The selected wavelengths can achieve a vertical resolution of 0.6-1.4 km in the altitude range of 5-35 km. The relative random error of profile detection is lower than 0.8%. The minimum relative random error (0.229%) appears at 10 km. The research results can provide an important reference for the design of a prototype of spaceborne LIO atmospheric detection system.
李文冬, 刘继桥, 朱亚丹, 陈卫标. LEO-LEO红外激光掩星CO2浓度测量技术研究[J]. 中国激光, 2019, 46(8): 0810001. Wendong Li, Jiqiao Liu, Yadan Zhu, Weibiao Chen. LEO-LEO Infrared Laser Occultation Technique to Measure Atmospheric Carbon Dioxide Concentration[J]. Chinese Journal of Lasers, 2019, 46(8): 0810001.