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非均匀湍流路径上光传播数值模拟的相位屏分布

钱仙妹 朱文越 饶瑞中

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非均匀湍流路径上光传播数值模拟的相位屏分布

钱仙妹, 朱文越, 饶瑞中

Phase screen distribution for simulating laser propagation along an inhomogeneous atmospheric path

Qian Xian-Mei, Zhu Wen-Yue, Rao Rui-Zhong
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  • 针对非均匀湍流路径上光传播的数值模拟,研究了相位屏分布的三种不同设置方案,即均匀分布相位屏(UDPS)、等Rytov指数间隔的相位屏(ERPS)和等Fried参数间隔的相位屏(EFPS).结果表明,ERPS方案根据折射率起伏的强弱设置密疏相间的相位屏,实现了对不同折射率起伏区的充分采样,是非均匀路径上相位屏分布的首选方案.在满足相位屏间距基本要求的前提下,决定相位屏间隔的Rytov指数间隔的选取具有较大的任意性,统计结果显示,尽管相位屏间Rytov指数变化超过一个数量级,但光束有效半径、能量Strehl比的变化均小于2.1%,模拟结果与理论结果符合很好,表明了ERPS方案的可靠性和稳定性.
    With respect to the problem of light uplinks and downlinks in atmospheric turbulence, the strength of turbulence changes greatly along the path. The distribution of phase screens on the path is a vital problem to be solved in the numerical simulation of light propagation. Three different approaches: uniform distributed phase screen (UDPS), equivalent Rytov index-interval phase screen (ERPS) and equivalent Fried parameter-interval phase screen (EFPS) are discussed. It is found that, by using ERPS method, the distance between phase screens changes automatically according to the strength of turbulence, and the fluctuation of turbulence can also be sampled sufficiently. Under the precondition that the critera for phase screen interval are satisfied, the Rytov index interval of ERPS could be any arbitrary constant value. Statistical results show that, even the Rytov index interval changes by one order of magnitude, both effective beam radius and Strehl ratio of energy change for only 2.1%. And simulated results agree well with theoretical ones. All this indicates the stability and reliability of the ERPS method.
    • 基金项目: 中国科学院知识创新工程重要方向性项目(批准号:CXJJ-249)和国家自然科学基金(批准号:0704071)资助的课题.
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  • 文章访问数:  6997
  • PDF下载量:  1309
  • 被引次数: 0
出版历程
  • 收稿日期:  2007-11-26
  • 修回日期:  2008-07-03
  • 刊出日期:  2009-09-20

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