镜像反转DMFT抛物方程算法  

Mirror Image Reverse DMFT Parabolic Equation Algorithm

作　　者：董道广 康健[1] 田文飚[1] 芮国胜[1] 

机构地区：[1]海军航空工程学院信号与信息处理山东省重点实验室,山东烟台264001

出　　处：《雷达科学与技术》2015年第5期549-552,562,共5页Radar Science and Technology

基　　金：国家自然科学基金(No.41476089)

摘　　要：基于双向DMFT抛物方程算法,提出一种镜像反转DMFT算法,该算法适用于刃峰存在条件下的电波传播计算,无须调用后向DMFT算法,在传统前向DMFT算法的步进计算流程内,将峰面前侧的地形和大气折射率信息加载于峰面镜像方向,基于镜像反转完成对后向反射场的计算,降低了电波传播计算程序上的复杂性,更符合DMFT的迭代计算特点。通过对DMFT抛物方程算法的理论推导,证明了镜像反转DMFT算法与双向DMFT算法在理论上是等效的,并采用所提算法计算了单刃峰和多刃峰情形下的电波传播损耗分布。A mirror image reverse DMFT algorithm is proposed based on bidirectional DMFT parabolic equation algorithm. This algorithm can be applied to radio propagation calculation when blade terrain exists, without calling the backward DMFT algorithm. By loading the topographic as well as atmospheric refractive information to the mirror direction of the peak surface, this algorithm completes the calculation of backward reflected field based on mirror reversing in the step calculation process of the traditional forward DMFT algo- rithm. In this way, the algorithm reduces the complexity of radio propagation calculation procedures, so it is more in line with the iterative characteristics of the DMFT algorithm. Through theoretical derivation of the DMFT parabolic equation algorithm, it is proved that the calculation results of the mirror image reverse DM- FT algorithm and the traditional bidirectional DMFT algorithm are equivalent. The radio propagation loss distribution in conditions of single blade and multiple blades is calculated.

关 键 词：刃峰 镜像反转 大气折射率 抛物方程 

分 类 号：TN951[电子电信—信号与信息处理]