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利用半解析蒙特卡罗方法计算光子在地球大气和海水中传输的多径时间扩展效应,大气和海水信道的散射相位函数采用修正Henyey-Greenstein函数,根据标准大气数据对散射和衰减系数进行加权处理.结果表明:光脉冲在地球大气和海水中传输时的多径时间扩展与卫星高度、水下深度及大气和海水的散射强度有关;水下接收信号的平均多径时间扩展可达33.4~34.9μs,最大时间扩展可达160μs;星载激光对潜通信下行链路的多径时间扩展效应不能由大气和海水各自的多径时间扩展效应和表示.
The semi-analytical Monte Carlo method is used to calculate the multipath time-spreading effect of photons traveling in the Earth’s atmosphere and seawater. The scattering phase function of the atmospheric and seawater channels is corrected by the Henyey-Greenstein function and the scattering and attenuation coefficients are weighted according to the standard atmospheric data The results show that multipath propagation time of light pulse in the earth’s atmosphere and seawater is related to satellite height, underwater depth and scattering intensity of the atmosphere and seawater. The average multipath time extension of the underwater received signal can reach 33.4 ~ 34.9 μs and the maximum time can be extended up to 160μs. The multipath time spreading effect of satellite laser on the downlink of sub-communication can not be expressed by multipath time expansion effect of atmosphere and seawater respectively.