Rytov 近似法在闪烁效应中的应用与改进

摘要

The scintillation index model of the target receiving plane which the active detecting la-ser of one-way transmission for horizontal transfer in turbulent atmosphere has been established with the methods of Rytov approximation and the transmission theory of Gaussian beam in the atmospheric turbulence.Then the model is improved so that it can be applied to the strong turbulence atmospheric conditions and the numerical simulation results of the modified model are verified by experiments. The results show that the improved model is more in line with the actual transmission.The transmis-sion distance,turbulence intensity and other factors affect the scintillation index changing.Numerical simulation and experimental results are in good agreement on the trends,but because of the system local noise,detector noise and background noise such random factors existing so that the measured re-sults is slightly larger than the numerical simulation results.%利用 Rytov 近似法和湍流大气中高斯波束的传输理论，针对湍流大气中水平传输的主动探测激光，建立了其单程传输到达目标端接收平面的闪烁指数模型，对模型进行改进使其适用于强湍流的大气条件，并对数值仿真的结果进行实验验证。结果表明，改进后的模型更符合实际传输情况，传输距离、湍流强度等因素都会影响闪烁指数的变化，数值模拟与实验测量的结果在变化趋势上有较好的吻合。但由于系统本地噪声、探测器散粒噪声和背景噪声等随机因素的存在，使实测结果略大于数值模拟结果。