高功率微波在土壤中传播模型的建立及非线性传播特性研究

项目名称： 高功率微波在土壤中传播模型的建立及非线性传播特性研究

项目编号： No.61201095

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 唐涛

作者单位： 成都信息工程学院

项目金额： 25万元

中文摘要： 高功率微波（HPM, 脉冲峰值功率大于100MW）在土壤中传播时，会引起土壤特性的变化（如土壤发生电离等非线性变化），土壤特性的变化又将反作用于高功率微波，影响其能量的传输效率。通过对高功率微波作用下的土壤动态电离过程的分析，构建包括电阻率等土壤特性参量时变方程及麦克斯韦方程组构成的完备系统，采用时域有限差分（FDTD）方法对该系统进行求解，并且对该系统方程的FDTD差分格式的稳定性条件和数值色散问题进行推导和分析。采用分区域（非并行）计算的方式对FDTD算法进行改进，以提高FDTD计算大空间传播问题的效率。在这些研究基础上，对超宽带高功率微波的土壤传播问题、传播能量损耗问题、重复频率脉冲土壤传播问题、土壤的动态电离过程以及其它非线性物理过程进行研究。本课题的研究将对强电磁辐射防护、人防工程、电子信息设备防护、探地高功率雷达和高功率源设计等方面提供实际参考依据。

中文关键词： 高功率微波；土壤传播模型；土壤电离；；

英文摘要： The propagation of high-power microwave (HPM) in soil results in changes of soil properties (such as soil ionization and variation of electromagnetic parameters, which are nonlinear behavior), and these changes in soil properties in turn counteract the HPM, decreasing the energy transmission efficiency. By analysising the dynamic ionization process of soil under HPM, a complete systems including electrical resistivity, other soil properties change dependency of time equations and the Maxwell equations are constructed and solved by employing Finite Difference Time Domain (FDTD) method. The FDTD differential scheme of the system equations and its stability condition as well as the numerical dispersion will be derived and analyzed. Furthermore, some improvements of FDTD algorithm is proposed and higher caculation efficiency of the FDTD is achieved by employing sub-regional (non-parallel) way, specifically for electromagnetic wave propagation through large space problems. Based on these studies, the soil propagation of ultra-wideband (UWB) high-power microwave, energy loss during propagation, the soil propagation of Repetition-Frequency HPM Pulses, soil dynamic ionization process as well as other nonlinear physical process will be investigated. The implementation of this subject will provide the actual reference f

英文关键词： High power microwave；soil propagation model；soil ionization；；