| 1. | Asymptotic ray theory
渐近射线理论 |
| 2. | Two ways of analyzing optical waveguide that are wave theory and optical ray theory are formulated
本文介绍了分析光波导的两种方法：波动理论和射线理论。 |
| 3. | The refractive index of one kind of micro - structured fiber were studied by optical ray theory , the distribution of refractive index is gived
应用射线理论对一种微结构光纤包层的折射率进行了计算，给出了折射率分布的精确解。 |
| 4. | The effects of observing scale on the measurements of acoustical velocity were studied by ray theory and equivalent medium theory
分析了声波频率影响传播速度的机理，给出了不同温度不同压力条件下声波速度随频率变化关系的实例。 |
| 5. | Besides that ray theory is helpful to calculate three - dimensional sound field , and the inversion of sound field could be finished quickly enough to realize the detection of ocean environment in wide area
特别是射线理论对解三维声场尤为方便，它将有望实现三维声场的快速计算和声场的反演，达到海详环境的监测目的。 |
| 6. | The characteristics of the underwater acoustic channel are analyzed in this thesis , with the emphasis on the multipath propagation characteristics . and the underwater acoustic multipath channel model is established on the basis of ray theory
在本论文中，我们对水声信道特性，尤其是水声信道的多径传播特性进行了分析，并且在声线理论的基础上建立了水声多径信道模型。 |
| 7. | At the same time , as more and more radio sources have been set up , electromagnetic pollution in urban area becomes more serious , which is harmful to people ' s healthy and communication system so it is necessary to simulate the electromagnetic propagation in urban area by computer being an approximate hf method in evaluating em scattering ， the complex ray method （ crm ） is valuable in actual applications ， mainly benefited from its simple physical model ， convenient mathematical formulation and computational efficiency , especially with the scenes of scattering from complex objects based on the condition mentioned above , a hybrid ray model of the urban area electromagnetic wave propagation prediction was established with the foundation of ray tracing theory and complex ray theory
复射线技术作为一种求解波场问题的高频近似方法，由于其具有物理模型简单、数学处理方便、计算效率高等优点，在复杂的目标散射特性分析等应用领域中有着重要的应用价值。基于以上的情况，本文在射线追踪理论和复射线理论的基础上，为城区环境建立了混合射线预测模型。本文采用椭圆模型对已有的射线追踪方法进行加速，并将复射线理论应用到城区环境电波传播预测中，提出新的预测方法混合射线方法。 |
| 8. | Then the important reference are provided for the optimal system design and technical parameters selecting of long - range underwater acoustic information transmission system . 2 . the underwater acoustic channel model based on ray theory is studied , and in combination with the system function of coherent multi - path channel , the method for underwater acoustic channel response prediction through eigenrays finding is obtained
研究了基于声线理论的水声信道声场模型，分析并仿真了在多种不同声速条件下的声线传播以及不同海底状况下的声传播；结合相干多途信道的系统函数，通过求取本征声线进行了水声信道响应的预测。 |
