【摘要】：本文的主要目的是分析艦船多天線系統(tǒng)的電磁兼容性,采用的是電磁計算方法中使用較多的一種瞬態(tài)時域方法---時域有限差分法。傳統(tǒng)的時域有限差分法在進行船體和天線建模的時候,由于模型比例懸殊,會造成一些影響計算精度或者需要極大地計算量的情況,于是本文在使用時域有限差分法的時候,引入了細導線方法。細導線方法是給出了計算較大模型時,在模型尺寸和天線半徑比例很大的時候,如何通過Yee網(wǎng)格的設置,來減少軟件的計算量,同時不影響天線計算的精度�，F(xiàn)階段,隨著電子戰(zhàn)的應用范圍越來越廣,對于艦船通信系統(tǒng),各種電子裝備之間的互相干擾也越來越多發(fā)。對于這種大型的天線平臺,由于建模的時候需要考慮的因素很多,使用細導線方法能很方便的建模和簡化計算。本文首先介紹了傳統(tǒng)Finite difference time domain(FDTD)方法的迭代公式和邊界參數(shù)的設置,然后詳細介紹了關于各種天線布置的天線阻抗計算,接著闡述了細導線方法及細導線方法的一些改進措施,激勵源的改進,細線模型的改進,然后給出了基于細導線方法和Uniaxial medium perfectly matched layer(UPML)吸收邊界的FDTD程序設計思路,論述了C++編寫的cabelsfdtd程序并結合算例驗證程序的正確性。最后,分別對船體和天線進行建模,根據(jù)艦船天線使用的實際情況,計算了同一激勵源下艦船各天線之間耦合的特性,根據(jù)計算結果的曲線圖對比,最終得出艦船多天線系統(tǒng)的電磁兼容分析結論。
[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.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U674.703.3;TN03

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本文編號：2331096