Belmonte A, Rye B J
Appl Opt. 2000 May 20;39(15):2401-11. doi: 10.1364/ao.39.002401.
Simulations of beam propagation in three-dimensional random media were used to study the effects of atmospheric refractive turbulence on coherent lidar performance. By use of the two-beam model, the lidar return is expressed in terms of the overlap integral of the transmitter and the virtual (backpropagated) local oscillator beams at the target, reducing the problem to one of computing irradiance along the two propagation paths. This approach provides the tools for analyzing laser radar with general refractive turbulence conditions, beam truncation at the antenna aperture, beam-angle misalignment, and arbitrary transmitter and receiver configurations. Simplifying assumptions used in analytical studies, were tested and treated as benchmarks for determining the accuracy of the simulations. The simulation permitted characterization of the effect on lidar performance of the analytically intractable return variance that results from turbulent fluctuations as well as of the heterodyne optical power and system-antenna efficiency.
利用三维随机介质中光束传播的模拟来研究大气折射湍流对相干激光雷达性能的影响。通过使用双光束模型，激光雷达回波可以用目标处发射光束与虚拟（反向传播）本地振荡器光束的重叠积分来表示，从而将问题简化为计算沿两条传播路径的辐照度。这种方法为分析具有一般折射湍流条件、天线孔径处光束截断、光束角度失准以及任意发射机和接收机配置的激光雷达提供了工具。对分析研究中使用的简化假设进行了测试，并将其作为确定模拟精度的基准。该模拟能够表征湍流波动导致的解析上难以处理的回波方差对激光雷达性能的影响，以及外差光功率和系统天线效率的影响。
