地下目标电磁散射的时域有限差分计算
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摘要
地下目标电磁散射是散射计、探地雷达、合成孔径雷达等遥感系统的理论基础之一。本文集成多项计算电磁学中的先进计算技术，建立了地下目标电磁散射的高效、精确计算模型；在建立的地下目标计算模型基础上，开发了地下目标散射的计算程序，并对程序的计算精度和效率作了深入仔细的研究；通过分析计算机软、硬件并行技术，指出了地下目标散射FDTD计算的难点和关键，给出了一种简单、易行的并行方案以及实施结果；利用开发的并行地下目标散射计算程序，对地下目标的散射特征作了计算和分析；最后本文还对各向异性目标，随机粗糙面下的目标的散射作了初步研究。
The electromagnetic scattering by buffed objects is one of theoretical basis of microwaveremote system, such as scatterometer, ground penetrating radar (GPR) and synthetic apertureradar (SAR). In this dissertation, a variety of advanced electromagnetic computationaltechniques are integrated to build the simulation model of scattering by buried targets. Basedon the built simulation model, a general, accurate, and efficient FDTD program is developedand numerically investigated for computing scattering by buried objects. Through analyzingthe recent developed parallel technologies in computer science including hardware andsoftware, the difficulties and the key points in parallelization are pointed out for computingscattering by buried targets. A simple and easy parallel approach is presented, implemented,and numerically studied for computing scattering by buried targets. The scatteringcharacteristics by the buried objects are analyzed and discussed by employing the developedparallel FDTD program. Besides, the scattering by anisotropic objects and random surfacesare also studied.
The electromagnetic scattering by buffed objects is one of theoretical basis of microwaveremote system, such as scatterometer, ground penetrating radar (GPR) and synthetic apertureradar (SAR). In this dissertation, a variety of advanced electromagnetic computationaltechniques are integrated to build the simulation model of scattering by buried targets. Basedon the built simulation model, a general, accurate, and efficient FDTD program is developedand numerically investigated for computing scattering by buried objects. Through analyzingthe recent developed parallel technologies in computer science including hardware andsoftware, the difficulties and the key points in parallelization are pointed out for computingscattering by buried targets. A simple and easy parallel approach is presented, implemented,and numerically studied for computing scattering by buried targets. The scatteringcharacteristics by the buried objects are analyzed and discussed by employing the developedparallel FDTD program. Besides, the scattering by anisotropic objects and random surfacesare also studied.
引文
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