A two-ray model is used for the frequency selective fading channel.
频率选择性衰落信道采用了两径模型。
A geometric ray model for the propagation of light in a step fiber is presented, and the cut-off conditions are derived.
提出阶跃光纤导光的一种几何射线模型，方便地求出了截止条件，并与光波导理论所得结果作了比较。
A comparison between the wave and ray models shows that the ray model gives an approximation of the transmission loss in an acoustic vector field.
经过与波动理论的比较，说明该模型仅是矢量声场传播损失的简单近似。
Results of acoustic field prognosis on wave theory, normal model and ray model are compared, and the approximate degree of the later two models is given.
本文对比了波动理论、简正波声场和射线模型的声场预报结果，给出了后二种方法的近似程度。
The ray model is used to describe the low frequency acoustic field in shallow water. Applicability of this model in shallow water or deep water at low frequencies is checked.
采用射线理论对浅海低频矢量声场进行建模，并且分析了该模型在浅海或深海低频时的适用性。
Ray model is one of the conventional sound propagation models, which can be used to model the sound propagation in the irregular ocean environment.
射线模型是比较常见的传播模型之一，可以用于不规则海域声传播建模。
Ray model is one of the conventional sound propagation models, which can be used to model the sound propagation in the irregular ocean environment.
射线模型是比较常见的传播模型之一，可以用于不规则海域声传播建模。
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