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差分吸收激光雷达是高精度测量大范围二氧化碳浓度的有效手段。研究了机载路径积分差分吸收激光雷达测量二氧化碳柱线浓度的主要误差项,分析了这些误差项导致的二氧化碳柱线浓度反演误差。介绍了机载差分吸收激光雷达基本工作原理,并理论分析了大气温度、压强和水汽不确定性误差,激光频率稳定性和飞机姿态速度测量不确定性等系统误差,以及不同地表反射率产生的随机误差。分析结果表明:在二氧化碳浓度380 ppm(1 ppm=10-6)时,机载激光雷达二氧化碳柱线浓度综合测量误差约为0.71 ppm,满足1 ppm的二氧化碳柱线浓度高精度测量需求。
Difference absorption lidar is an effective means of high-precision measurement of a wide range of carbon dioxide concentrations. The main error term of CO2 column concentration measured by airborne differential-absorption Lidar is studied. The errors of inversion of carbon dioxide column concentration caused by these error terms are analyzed. The basic working principle of airborne differential absorption laser radar is introduced and the systematic errors of atmospheric temperature, pressure and water vapor uncertainty, laser frequency stability and aircraft attitude velocity measurement uncertainty are analyzed theoretically, and the effects of different surface reflectance Random error. The results show that the integrated measurement error of airborne lidar carbon dioxide concentration is about 0.71 ppm at a concentration of 380 ppm (1 ppm = 10-6), which meets the requirement of high precision measurement of carbon dioxide concentration of 1 ppm.