水下激光脉冲时延特性的仿真分析

Simulation and Analysis of Time Delay Characteristics of Underwater Laser Pulse

利用蒙特卡罗数值模拟方法研究了海水散射引起的激光脉冲时延效应,分析了海水类型、传输距离、收发器参数等对激光脉冲时延的影响。数值仿真结果表明,在清澈海域,激光脉冲的时延展宽随传输距离的增加变化不明显,且在传输距离小于50m时,信道时延小于0.5ns,收发器参数对信道时延的影响小;而在浑浊海域,信道散射引起的多径效应会使接收功率随接收孔径的增大而升高,信道时延也会随之增大。当接收视场角小于90°时,其对接收功率和时延展宽的影响大;当视场角为90°?180°时,其对接收功率和时延展宽的影响小。

Herein,the effect of laser pulse time delay induced by seawater scattering is studied using the Monte Carlo numerical simulation method.Further,we analyze the effects of seawater types,transmission distance,and transceiver parameters on laser pulse time delay.The numerical simulation results indicate that in clear seas,the laser pulse time delay broadening does not obviously change with the increase of transmission distance.Furthermore,when the transmission distance is less than 50 m,the channel time delay is smaller than 0.5 ns,indicating the transceiver parameters exhibit only small impact on the channel delay.However,in turbid seas,the receiving power and the channel time delay increase with the increase of receiving aperture under the multipath effect induced by channel scattering.When the receiving angular field of view(AFOV)is less than 90°,its influence on the receiving power and the time delay broadening is observed to be significant.However,when the AFOV is between 90°and 180°,the receiving power and the time delay broadening demonstrate no obvious changes with AFOV.