基于细导线FDTD舰船多天线电磁兼容分析
发布时间：2018-11-14 11:59
【摘要】：本文的主要目的是分析舰船多天线系统的电磁兼容性,采用的是电磁计算方法中使用较多的一种瞬态时域方法---时域有限差分法。传统的时域有限差分法在进行船体和天线建模的时候,由于模型比例悬殊,会造成一些影响计算精度或者需要极大地计算量的情况,于是本文在使用时域有限差分法的时候,引入了细导线方法。细导线方法是给出了计算较大模型时,在模型尺寸和天线半径比例很大的时候,如何通过Yee网格的设置,来减少软件的计算量,同时不影响天线计算的精度。现阶段,随着电子战的应用范围越来越广,对于舰船通信系统,各种电子装备之间的互相干扰也越来越多发。对于这种大型的天线平台,由于建模的时候需要考虑的因素很多,使用细导线方法能很方便的建模和简化计算。本文首先介绍了传统Finite difference time domain(FDTD)方法的迭代公式和边界参数的设置,然后详细介绍了关于各种天线布置的天线阻抗计算,接着阐述了细导线方法及细导线方法的一些改进措施,激励源的改进,细线模型的改进,然后给出了基于细导线方法和Uniaxial medium perfectly matched layer(UPML)吸收边界的FDTD程序设计思路,论述了C++编写的cabelsfdtd程序并结合算例验证程序的正确性。最后,分别对船体和天线进行建模,根据舰船天线使用的实际情况,计算了同一激励源下舰船各天线之间耦合的特性,根据计算结果的曲线图对比,最终得出舰船多天线系统的电磁兼容分析结论。
[Abstract]:The main purpose of this paper is to analyze the electromagnetic compatibility of warship multi-antenna systems. A transient time-domain method, finite-difference time-domain (FDTD) method, which is widely used in electromagnetic calculation methods, is adopted. When the traditional finite-difference time-domain (FDTD) method is used to model the ship and antenna, because of the difference in the scale of the model, it will cause some cases that affect the accuracy of calculation or require a great deal of computation, so this paper uses the finite-difference time-domain method. The thin wire method is introduced. The thin wire method is used to calculate the larger model. When the ratio of the size of the model to the radius of the antenna is very large, how to reduce the computational complexity of the software by setting the Yee mesh, without affecting the accuracy of the antenna calculation. At present, with the wide application of electronic warfare, there are more and more interferences between various electronic equipments for warship communication systems. For this large antenna platform, because there are many factors to be considered in modeling, the thin wire method can be used to model and simplify the calculation. This paper first introduces the iterative formula of traditional Finite difference time domain (FDTD) method and the setting of boundary parameters, and then introduces the calculation of antenna impedance about various antenna arrangement in detail. Then some improvements of the thin wire method and the thin wire method, the improvement of the excitation source, the improvement of the thin wire model, and the design of the FDTD program based on the thin wire method and the absorbing boundary of Uniaxial medium perfectly matched layer (UPML) are presented. The cabelsfdtd program written by C is discussed and the correctness of the program is verified by a numerical example. Finally, the ship hull and antenna are modeled, according to the actual situation of the ship antenna, the coupling characteristics of the ship antenna under the same excitation source are calculated, and the results are compared according to the curve. Finally, the conclusion of electromagnetic compatibility analysis of ship multi-antenna system is obtained.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U674.703.3;TN03
本文编号：2331096
[Abstract]:The main purpose of this paper is to analyze the electromagnetic compatibility of warship multi-antenna systems. A transient time-domain method, finite-difference time-domain (FDTD) method, which is widely used in electromagnetic calculation methods, is adopted. When the traditional finite-difference time-domain (FDTD) method is used to model the ship and antenna, because of the difference in the scale of the model, it will cause some cases that affect the accuracy of calculation or require a great deal of computation, so this paper uses the finite-difference time-domain method. The thin wire method is introduced. The thin wire method is used to calculate the larger model. When the ratio of the size of the model to the radius of the antenna is very large, how to reduce the computational complexity of the software by setting the Yee mesh, without affecting the accuracy of the antenna calculation. At present, with the wide application of electronic warfare, there are more and more interferences between various electronic equipments for warship communication systems. For this large antenna platform, because there are many factors to be considered in modeling, the thin wire method can be used to model and simplify the calculation. This paper first introduces the iterative formula of traditional Finite difference time domain (FDTD) method and the setting of boundary parameters, and then introduces the calculation of antenna impedance about various antenna arrangement in detail. Then some improvements of the thin wire method and the thin wire method, the improvement of the excitation source, the improvement of the thin wire model, and the design of the FDTD program based on the thin wire method and the absorbing boundary of Uniaxial medium perfectly matched layer (UPML) are presented. The cabelsfdtd program written by C is discussed and the correctness of the program is verified by a numerical example. Finally, the ship hull and antenna are modeled, according to the actual situation of the ship antenna, the coupling characteristics of the ship antenna under the same excitation source are calculated, and the results are compared according to the curve. Finally, the conclusion of electromagnetic compatibility analysis of ship multi-antenna system is obtained.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U674.703.3;TN03
【参考文献】
相关期刊论文 前1条
1 黄纪军,马兴义,粟毅,匡纲要;复杂目标的FDTD几何—电磁建模方法[J];微波学报;2005年S1期
，本文编号：2331096
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