空间差分吸收激光雷达探测地表大气压力的波长选择

Operating wavelength selection for spaceborne differential absorption lidar measuring surface pressure

根据美国标准大气模型进行了蒙特卡诺模拟,仿真研究了大气温度的不确定性对大气压力探测带来的随机误差和系统偏差,发现在氧气的A带中选择764.765 nm和765.094 nm为探测波长online,选择位于两者之间的764.948 nm为参考波长offline,是获得较小探测误差的一种方案;优化的探测波长既不在A带的吸收线上,亦不在某两吸收线之间的凹槽中间,而是位于A带吸收线p13和p14线的侧翼,这一结果对于建立积分路径差分吸收激光雷达探测地表大气压力的遥感仪器,起到参考作用.

We report the selection of the lidar instrument operating wavelengths,the Monte Carlo simulation was made,knowledge that imprecise temperature affect on the systemic bias and random errors of surface pressure measurement was developed.When 764.765 nm and 765.094 nm were selected as detection wavelengths,then 764.948 nm between both online was selected as reference wavelengths,the emulation research show that measurement error is least.Excellent detection wavelength was neither in absorption peak value wavelength,nor was in trough between two absorption line,that were on wing of p13 and p14 absorption line of A band.This result has directive function to build up an IPDA for measurement of surface pressure.