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水下激光雷达在近场就已经发生了激光的多次散射,其共轴光学系统对近场水体的强散射信号将具有一定的抑制能力,可防止接收系统饱和。研究共轴光学系统近场抑制比的计算方法具有重要意义。分析讨论了常规光子返回贡献公式不适于近场计算的原因,提出新的水下近场共轴光学系统的返回贡献公式及基于坐标变换的简单计算方法,结合Monte Carlo仿真计算了水下近场抑制比。分析计算了近场抑制比、抑制时长与激光脉冲宽度的关系,结果表明:该方法完全可满足水下共轴光学系统计算的需要。
Underwater laser radar in the near field has occurred in the laser multiple scattering, the coaxial optical system for near-field water scattering signals will have a certain degree of inhibition, to prevent the receiving system saturation. It is of great importance to study the calculation method of near field suppression ratio of coaxial optical system. The reasons for the conventional photon return contribution formula to be unsuitable for near-field calculation are analyzed and discussed. The return contribution formula of a new underwater near-field coaxial optical system and the simple calculation method based on coordinate transformation are proposed. Monte Carlo simulation is used to calculate the underwater near-field Suppression ratio. The relationship between near-field suppression ratio, suppression time and laser pulse width is analyzed and calculated. The results show that this method can fully meet the needs of underwater coaxial optical system.