水下湍流连续相位屏生成的仿真研究

发布时间：2018-05-13 10:34

本文选题：海洋光学 + 水下湍流　；参考：《红外与激光工程》2017年07期

【摘要】：建立水下湍流多层相位屏的理论和模型是开展水下湍流研究的主要问题。考虑水下湍流的统计特性,通过三维协方差矩阵预测的方法进行了水下湍流的统计特性和连续性的模拟。提出重叠分配矩阵的方法,优化多层相位屏的模拟,分析了计算效率和湍流统计特性表征之间的关系。结果表明:重叠分配矩阵方法能有效提高单层相位屏的生成效率。三维协方差矩阵预测方法可以使相位屏具有层间相关性,其在单层相位屏内的统计特性也与理论符合较好,但是在小尺度和大尺度下与理论值有一定偏差。该研究将传统的独立多层二维相位屏拓展到了空间相关的多层相位屏,使得利用多层相位屏描述水下湍流更加符合物理实际。
[Abstract]:The theory and model of multi-layer phase screen for underwater turbulence are the main problems in the research of underwater turbulence. Considering the statistical characteristics of underwater turbulence, the statistical characteristics and continuity of underwater turbulence are simulated by the method of three dimensional covariance matrix prediction. An overlapping allocation matrix method is proposed to optimize the simulation of multi-layer phase screens. The relationship between computational efficiency and statistical characteristics of turbulence is analyzed. The results show that the overlapping allocation matrix method can effectively improve the efficiency of single-layer phase screen generation. The three dimensional covariance matrix prediction method can make the phase screen have interlayer correlation, and its statistical characteristics in the single layer phase screen are in good agreement with the theory, but there is a certain deviation between the theoretical value and the small scale and large scale. In this study, the traditional independent multi-layer two-dimensional phase screen is extended to the spatially correlated multi-layer phase screen, which makes the use of the multi-layer phase screen to describe the underwater turbulence more in line with the physical reality.
【作者单位】：哈尔滨工业大学物理系;水下测控技术重点实验室;
【基金】：国家自然科学基金(61450002)
【分类号】：O357.5

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