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利用平面平行板模型和晶体膜层理论定量分析了1/2波片对机载激光雷达回波信号偏振探测的影响。计算结果表明:当入射光波长为532nm时,1/2石英波片对机载激光雷达回波信号平行分量与垂直分量透过率比值的影响幅度为0.82～1.196,1/2方解石波片对机载激光雷达回波信号的平行分量与垂直分量透过率比值的影响幅度为0.86～1.27;若用1/2石英波片测得的k=1.2,当考虑石英波片对五的影响时,则偏振探测两通道k的真实值应在1.003～1.463之间;若用1/2方解石波片测得的k=1.2,当考虑方解石波片对k的影响时,偏振探测两通道k的真实值应在0.945～1.395之间。由于1/2波片对k的影响,使机载激光雷达反演得到卷云等探测目标的退偏振比有较大的系统误差。
The influence of 1/2 wave plate on the polarization detection of airborne lidar echo signal is quantitatively analyzed by plane parallel plate model and crystal film theory. The calculated results show that when the wavelength of incident light is 532 nm, the influence of 1/2 quartz wave plate on the transmittance ratio of the parallel component and the vertical component of the airborne lidar echo signal is 0.82-1.1961,1 / 2, The influence range of the ratio of the parallel component to the vertical component of the airborne lidar echo signal is 0.86 ~ 1.27. If k = 1.2 measured with 1/2 quartz wave plate, when considering the influence of quartz wave plate on V , Then the true value of k for two channels of polarization detection should be between 1.003 and 1.463. If k = 1.2 measured with 1/2 calcite wave plate, when the influence of calcite wave plate on k is considered, the polarization detection of two channels of k The real value should be between 0.945 ~ 1.395. Due to the influence of 1/2 wave plate on k, there is a large systematic error in the depolarization ratio of the detection target obtained by airborne lidar inversion.