并行FDTD方法在海面及其上方漂浮目标复合电磁散射中的应用

发布时间：2019-08-05 21:21

【摘要】：利用基于图形处理器(Graphics Processing Unit,GPU)的并行时域有限差分(Finite Difference Time Domain,FDTD)法计算一维粗糙海面及其上方二维漂浮目标的复合电磁散射.采用各向异性完全匹配层(Uniaxial Perfectly Matched Layer,UPML)吸收边界作为截断边界,为了便于并行程序的设计,在整个计算区域使用UPML吸收边界差分公式进行迭代.利用异步通信技术来隐藏主机和设备之间的通信时间,同时使用片上的共享存储器提高读取速度,进一步对程序进行优化,得到很好的加速比,证明了该方法的计算高效性.通过与串行FDTD法以及串行矩量法获得的数值结果进行比较,验证了该并行方法的正确性,进而研究了海面上方类似舰船漂浮目标的电磁散射特性,讨论了入射角、海面风速以及目标吃水深度对双站散射系数的影响.
[Abstract]:The parallel finite-difference time-domain (Finite Difference Time Domain,FDTD) method based on graphics processor (Graphics Processing Unit,GPU) is used to calculate the composite electromagnetic scattering of one-dimensional rough sea surface and its upper two-dimensional floating targets. The absorption boundary of anisotropy perfectly matched layer (Uniaxial Perfectly Matched Layer,UPML) is used as the truncated boundary. In order to facilitate the design of parallel program, the UPML absorption boundary difference formula is used to iterate through the whole calculation region. The asynchronous communication technology is used to hide the communication time between the host and the device, at the same time, the shared memory on the chip is used to improve the reading speed, and the program is further optimized, and a good acceleration ratio is obtained, which proves the computational efficiency of the method. Compared with the numerical results obtained by serial FDTD method and serial moment method, the correctness of the parallel method is verified, and then the electromagnetic scattering characteristics of similar ship floating targets above the sea surface are studied, and the effects of incident angle, sea surface wind speed and target draught depth on the bistatic scattering coefficient are discussed.
【作者单位】：西安电子科技大学物理与光电工程学院;西安电子科技大学综合业务网理论及关键技术国家重点实验室;中航工业雷达与电子设备研究院航空电子系统射频综合仿真航空科技重点实验室;
【基金】：国家杰出青年科学基金(61225002) 航空科学基金与航空电子系统射频综合仿真航空科技重点实验室联合资助(20132081015)
【分类号】：TN011

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