二次散射对脉冲激光雷达回波功率的影响

摘要

Double scattering power was analyzed theoretically and a method to compute double scattering power was proposed. It is accordant between theoretical computation and the test data result from lidar experiments, which proved the correctness of the theory. A filtering method was chosen to reduce the impact of double scattering to lidar. The double scattering computation result can explain the phenomena of ripple wave, which was discovered in experiment. The amplitude and frequency of ripple wave is decided by lidar characteristic and the particle characteristic. The attenuation speed of double scattering power is far lower than which of single scattering, thus the double scattering power is very valuable for atmosphere detection and worthy of being further researched on.%理论上分析了二次散射对大气脉冲激光雷达回波功率的影响并提出一种计算方法.采用某型大气激光雷达的测试结果与理论计算具有较强的一致性,证明了理论结果的正确性.根据二次散射回波信号的特点,选用适当的滤波方法将其影响降至最低.二次散射的理论计算解释了实测中发现的“纹波”现象,纹波的幅度和频率与雷达自身特性及粒子特性相关,其衰减速度较单次散射慢得多.因此对于大气探测具有进一步研究的重要价值.