复杂天线罩的电性能优化设计研究
发布时间：2018-08-06 16:01
【摘要】：天线罩作为雷达系统的重要组成部分，在现代通信中起到重要的作用。本毕业论文针对复杂天线罩结构进行了数值建模仿真，对宽频带天线罩进行罩的口面场计算和优化设计做了深入研究。主要创新点和工作如下： （1）推导了传统的等效传输线理论，用于分析薄壁和多层结构天线罩性能研究，并开发了天线罩等效平板的仿真计算软件； （2）以等效传输线理论为基础，详细推导物理光学法相关公式理论，通过算例验证程序的正确性； （3）针对复杂天线罩结构，成功地将复杂结构网格建模系统与天线罩散射特性计算方法（物理光学法）有机结合，解决了天线罩建模的网格剖分问题。通过FEKO计算出天线表面近场得到的等效源，实现了任意天线-天线罩一体化系统的建模和仿真的全过程。该方法可操作性强并易实现，解决了工程实践的需求； （4）开发了针对影响天线罩的电性能的介质参数（相对介电常数、损耗角正切、罩壁结构厚度、天线口面大小等）的遗传算法优化程序。基于此方法并通过适当选择频带范围和入射角范围内的采样点平均透波率作为适应度函数，成功地进行了宽频带天线罩和双频带天线罩的罩壁结构的优化设计。
[Abstract]:As an important part of radar system, radome plays an important role in modern communication. In this thesis, the numerical modeling and simulation of complex radome structure are carried out, and the calculation and optimization of the aperture field of the wideband radome are deeply studied. The main innovations and work are as follows: (1) the traditional equivalent transmission line theory is derived, which is used to analyze the performance of thin-walled and multi-layer radome, and the simulation software of equivalent plate is developed. (2) based on the equivalent transmission line theory, the related formula theory of physical optics method is deduced in detail, and the correctness of the program is verified by an example. (3) for the complex radome structure, The mesh modeling system of complex structure is successfully combined with the scattering characteristic calculation method of radome (physical optics method) to solve the mesh generation problem of radome modeling. The equivalent source obtained from the near field of antenna surface is calculated by FEKO, and the whole process of modeling and simulation of the integrated system of arbitrary antenna and radome is realized. The method is feasible and easy to realize, and solves the need of engineering practice. (4) the dielectric parameters (relative dielectric constant, tangent loss angle, thickness of the cover wall structure) which affect the electrical performance of the radome are developed. ) genetic algorithm optimization program. Based on this method, and by selecting the average transmittance of sampling points in the range of frequency band and angle of incidence as fitness function, the optimum design of the radome wall structure of broadband radome and dual-band radome is successfully carried out.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.2
本文编号：2168234
[Abstract]:As an important part of radar system, radome plays an important role in modern communication. In this thesis, the numerical modeling and simulation of complex radome structure are carried out, and the calculation and optimization of the aperture field of the wideband radome are deeply studied. The main innovations and work are as follows: (1) the traditional equivalent transmission line theory is derived, which is used to analyze the performance of thin-walled and multi-layer radome, and the simulation software of equivalent plate is developed. (2) based on the equivalent transmission line theory, the related formula theory of physical optics method is deduced in detail, and the correctness of the program is verified by an example. (3) for the complex radome structure, The mesh modeling system of complex structure is successfully combined with the scattering characteristic calculation method of radome (physical optics method) to solve the mesh generation problem of radome modeling. The equivalent source obtained from the near field of antenna surface is calculated by FEKO, and the whole process of modeling and simulation of the integrated system of arbitrary antenna and radome is realized. The method is feasible and easy to realize, and solves the need of engineering practice. (4) the dielectric parameters (relative dielectric constant, tangent loss angle, thickness of the cover wall structure) which affect the electrical performance of the radome are developed. ) genetic algorithm optimization program. Based on this method, and by selecting the average transmittance of sampling points in the range of frequency band and angle of incidence as fitness function, the optimum design of the radome wall structure of broadband radome and dual-band radome is successfully carried out.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.2
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