地下定标天线场分布特性的仿真研究

发布时间：2018-06-28 04:50

本文选题：无线电定位技术 + 地下信标　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：无线电定位技术广泛应用于交通运输、导航、动物行为研究等方面。一般来说,原有的定位技术都是基于地面或空中目标的。主要利用的是电磁波在空气中的传播特性。然而对于某些特殊情形,地下目标也需要进行定位。例如,在靶场试验中,炮弹往往由于巨大的惯性落入地下而难以寻找和定位。因而,对地下目标进行定位的研究具有重要理论意义和实际应用价值。地下目标定位涉及复杂的电波传播过程,地下信标天线辐射的电磁波到达地面的途径多样化,包括表面波、侧面波、折射波等。鉴于问题的复杂性,本文首先利用包含半空间界面的索莫菲积分解析法分析处于地面下方的偶极子在地面上方远区场的辐射特性。研究其场值的变化规律,为半空间地下目标的定位奠定理论基础。然后利用时域有限差分法(Finite Difference Time Domain,FDTD)研究平面分层时地下偶极天线的近场特征,进而研究有一定地形结构(例如斜坡、凸起、洼地等情形)地下偶极天线的辐射特性。通过对地下偶极天线场分布特点的分析,初步探讨了地面下方带信标目标的定位问题。
[Abstract]:Radio positioning technology is widely used in transportation, navigation, animal behavior research and so on. Generally speaking, the original positioning technology is based on the ground or air targets. The main use is the electromagnetic wave in the air propagation characteristics. However, for some special cases, underground targets also need to be located. For example, in range tests, projectiles are often difficult to locate and locate because of their huge inertia. Therefore, the study of underground target location has important theoretical significance and practical application value. Underground target location involves complex propagation of radio waves, and the electromagnetic waves radiated by underground beacon antennas reach the ground in a variety of ways, including surface waves, side waves, refraction waves and so on. In view of the complexity of the problem, in this paper, the radiation characteristics of a dipole under the ground in the far field above the ground are analyzed by means of the Sommerfeld integral analytic method including the half-space interface. The study of the variation law of the field value lays a theoretical foundation for the location of the underground target in half space. Then the near field characteristics of underground dipole antenna with plane stratification are studied by using finite difference time Domain FDTD (FDTD) method, and the radiation characteristics of underground dipole antenna with certain topographic structure (such as slopes, protrusions, depressions, etc.) are studied. Based on the analysis of the field distribution of the underground dipole antenna, the problem of locating the beacons under the ground is discussed preliminarily.
【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】：TN820

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