差分吸收激光雷达回波信号统计模型的研究

差分吸收激光雷达回波信号统计模型是研究差分吸收激光雷达系统的基础，但是现有的统计模型中均没有考虑大气湍流导致的激光闪烁对回波信号的影响。针对已有统计模型的缺陷和应用需要，综合考虑了大气湍流导致的激光闪烁、目标反射斑纹、接收噪声以及发射功率波动对回波信号统计特性的影响，提出了一种改进的长程差分吸收激光雷达回波信号统计模型，分析了该模型的统计特性。仿真结果表明大气湍流导致的激光闪烁对回波信号统计特性的影响十分显著，同时也验证了该统计模型比已有统计模型更精确、更符合实际。

Research on Return Signal Statistical Model of Differential Absorption Lidar

The return signal statistical model of differential absorption lidar (DIAL) is the basis of studying differential absorption lidar. However, the known statistical models ignored the effect of laser scintillation resulting from atmospheric turbulence on return signal. With considering effects of laser scintillation resulting from atmospheric turbulence, target reflective speckle, receiving noise and the fluctuation of transmitted power, a revised return signal statistical model of long range DIAL is presented and the statistical characteristics of this model are analyzed. The simulation results show that laser scintillation resulting from atmospheric turbulence has an important effect on the statistical characteristics of return signal and verify this statistical model more accurate and reasonable than other known models.