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对舰船尾流激光散射机理及探测过程的数值模拟是研究舰船尾流激光探测与制导的重要基础.首先分析了Monte Carlo方法引入到尾流激光雷达数值模拟领域研究的可行性.结合自行研制的尾流激光雷达实际参数,建立了尾流激光探测的Monte Carlo数值仿真模型.通过对仿真结果进行统计,深入剖析了仿真结果方差大及光子利用率低等问题的成因.为解决该问题,基于有偏采样理论和分裂-轮盘赌基本原理提出了接收光学视场内光子强行碰撞方法和以光子自由程总长度为准则的光子分裂方法,并进行了两方法的融合.仿真与实验结果的对比分析表明,提出的模型仿真结果与实验数据符合较好,验证了模型的正确性;提出的接收光学视场内光子强行碰撞方法和光子分裂方法能有效减小方差并提高光子利用率;解决了Monte Carlo方法引入到尾流激光雷达模拟过程中的适用性问题.
It is an important foundation to study the laser wake detection and guidance of warship.At first, the feasibility of introducing Monte Carlo method into the field of wake laser numerical simulation is analyzed. Developed a wake-up laser radar Monte Carlo numerical simulation model.According to the statistics of the simulation results, the cause of the large variance of the simulation results and the low utilization rate of the photon are analyzed in depth.In order to solve the problem , Based on the biased sampling theory and the split-roulette theory, a photon splitting method based on the total photon free path length and the method of photon forcibly collisions in the received optical field are proposed and the fusion of the two methods is carried out. The comparative analysis of the results shows that the proposed model simulation is in good agreement with the experimental data, which verifies the correctness of the model. The proposed method of photon collision and photon splitting in the received optical field can effectively reduce the variance and improve the photon utilization ; Solves the applicability of the Monte Carlo method introduced into wake laser radar simulation.