舰船尾流共轴激光雷达近场抑制比的计算方法  

Calculation method of near-field rejection rate of underwater wake lidar with coaxial optical system

作　　者：梁善勇[1] 张伟 王江安[1] 吴荣华[1] 马治国[1] 

机构地区：[1]海军工程大学电子工程学院,湖北武汉430033 [2]中船重工717所,湖北武汉430033

出　　处：《红外与激光工程》2012年第8期2063-2067,共5页Infrared and Laser Engineering

基　　金：武器装备预研基金项目(9140A26030110JB11);"十一五"预研(513030305)

摘　　要：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。The multiple scattering has happened when the laser pulse of the underwater lidar by wake is in the near-field transmission. Its coaxial optical system has a certain near-field suppression ability to the strong scattering and can prevent saturation of the receiver system. The near-field suppression ratio of the coaxial optical system is of great significance. The reason for that the traditional formula of photon returned contribution was not suitable for the near-field calculation was analyzed and a new formula was presented for underwater near-field coaxial optical system. A simple method to solve it with coordinate transforms was presented. The near-field suppression ratio was calculated based on Monte Carlo simulation. The relationship between near-field suppression ratio and suppression time and the relationship between near-field suppression ratio and the laser pulse width were analyzed and calculated. The results prove that this method can satisfy the needs of underwater coaxial optical system analysis completely.

关 键 词：激光雷达 后向散射 气泡 尾流 共轴光学系统 

分 类 号：TN958.98[电子电信—信号与信息处理]