改进DMFT算法研究粗糙海上蒸发波导中的电波传输特性  

Characteristics of radio wave propagation in the evaporation duct environment over the rough surface by the improved DMFT algorithm

作　　者：郭立新[1] 李宏强[1] 杨超[1] 吴振森[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071

出　　处：《电波科学学报》2009年第3期414-421,共8页Chinese Journal of Radio Science

摘　　要：基于抛物方程的改进离散混合傅立叶变换算法(DMFT)研究了无线电波在粗糙海面上蒸发波导环境下的传输特性。在辅助函数的离散过程当中采用后向差分公式代替以往的中心差分公式,保证了数值结果的稳定性。采用谱估计技术计算了粗糙海面上每个步长上的掠入射角并用Miller-Brown模型数值计算了粗糙海面的反射系数。用改进的DMFT算法数值模拟了无线电波在粗糙海面上蒸发波导中的传输损耗,并与标准大气和光滑海面蒸发波导中的传输损耗进行了比较,分析了海上风速和入射频率对传输损耗的影响。The characteristic of radiowave propagation in the evaporation duct environment over the rough sea surface is studied by using the improved Discrete Mixed Fourier Transform algorithm （DMFT） for the parabolic equation. In the process of discretization of the auxiliary function, the traditional central difference formula is replaced by the backward difference formula, which makes the numerical results more stable. The grazing angle of each range step and the reflection coefficient of rough sea surface are calculated with Spectral Estimation and Miller-Brown model, respectively. The radiowave propagation loss in the evaporation duct over the rough sea surface is simulated using the improved DMFT, and the propagation loss is compared with that for the case of the standard atmosphere and the smooth sea surface, the influence of the wind speed and the incident frequency on the propagation loss is analyzed in details.

关 键 词：抛物方程 离散混合傅立叶变换 蒸发波导 粗糙海面 传输损耗 

分 类 号：TN011[电子电信—物理电子学]