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机载海洋激光雷达在探测水下目标时,水面波动会影响向下传输的激光光束质量。基于蒙特卡罗方法定量分析了光子在目标平面上的空间分布,以及光子返回海气界面的空间分布和时间分布。模拟结果表明,随着风速的增加,光子在目标平面上的空间分布越来越偏离高斯分布;而光子返回海气界面的空间分布则严重偏离高斯分布,且风速的影响已经不再占主导地位。根据计算获得的光子返回海气界面的时间分布,发现当风速较大时,激光雷达的探测深度降低。
Airborne marine lidars detect submerged targets and fluctuations in the water surface affect the quality of the laser beam transmitted downward. Based on the Monte-Carlo method, the spatial distribution of photons on the target plane and the spatial distribution and temporal distribution of photon back to the air-sea interface are quantitatively analyzed. The simulation results show that with the increase of wind speed, the spatial distribution of photons on the target plane deviates from the Gaussian distribution more and more. However, the spatial distribution of photon return air interface deviates from Gaussian distribution seriously and the influence of wind speed is no longer dominant . According to the calculated time distribution of the photons returning to the air-sea interface, it is found that the detection depth of the laser radar decreases when the wind speed is high.