基于HITRAN数据库的大气激光雷达信号仿真

信号仿真研究是大气激光雷达研究的重要环节，结果可为激光雷达系统的设计和研制提供基础.本文仿真系统可用于激光雷达回波信号模拟.该仿真系统利用HITRAN数据库中的吸收谱线计算大气分子对激光的吸收光谱，并采用大气辐射传输模型中的气溶胶模式模拟气溶胶对激光的衰减.利用激光雷达方程，数值模拟了355nm，532nm以及1064nm的回波信号，并将532nm的数值模拟结果与实测结果进行对比，评估了激光雷达系统的光学效率. 

Research on Atmospheric Lidar Signal Simulation Based on HITRAN Database

Signal simulation is very important for atmospheric lidar research. It provides a basis for the design and development of lidar system. The simulation system in this paper can be used to simulate the lidar echo signal based on the absorption line data in the HITRAN database. It can calculate the absorption spectrum of atmospheric molecules, and the attenuation caused by aerosols. This simulation system can also calculate molecules scatter coefficient with parameters built in LOWTRAN and it can simulate the Signal-to-Noise Ratio (SNR) of the echo signal. The echo signals of 355nm, 532nm and 1064nm are simulated by the simulation system using the lidar equation and these signals agree well with the distribution of aerosols and atmospheric molecules. The simulation results of 532nm are compared with a Rayleigh Doppler lidar measured results and their results are consistent, which shows that the simulation system is reliable. The optical efficiency of this lidar system is roughly evaluated and its value is reasonable. The measured SNR and the simulated SNR are calculated. Their results are similar, so simulated SNR can evaluate the reliability of echo signals.