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首页> 外文期刊>Atmosphere >An FDTD Study of Errors in Magnetic Direction Finding of Lightning Due to the Presence of Conducting Structure Near the Field Measuring Station
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An FDTD Study of Errors in Magnetic Direction Finding of Lightning Due to the Presence of Conducting Structure Near the Field Measuring Station

机译：磁场测量站附近导体结构的存在对雷电磁测向误差的FDTD研究

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摘要

Lightning electromagnetic fields in the presence of conducting (grounded) structure having a height of 60 m and a square cross-section of 40 m × 40 m within about 100 m of the observation point are analyzed using the 3D finite-difference time-domain (FDTD) method. Influence of the conducting structure on the two orthogonal components of magnetic field is analyzed, and resultant errors in the estimated lightning azimuth are evaluated. Influences of ground conductivity and lightning current waveshape parameters are also examined. When the azimuth vector passes through the center of conducting structure diagonally (e.g., azimuth angle is 45°) or parallel to its walls (e.g., azimuth angle is 0°), the presence of conducting structure equally influences H x and H y , so that H x /H y is the same as in the absence of structure. Therefore, no azimuth error occurs in those configurations. When the conducting structure is not located on the azimuth vector, the structure influences H x and H y differently, with the resultant direction finding error being greater when the structure is located closer to the observation point.
机译：使用3D有限差分时域分析了存在于观察点约100 m内，高度为60 m，正方形横截面为40 m×40 m的导电（接地）结构中的雷电电磁场（ FDTD）方法。分析了导电结构对磁场的两个正交分量的影响，并评估了估计的雷电方位角的误差。还检查了地面电导率和雷电电流波形参数的影响。当方位角矢量以对角线（例如，方位角为45°）或平行于其壁（例如，方位角为0°）穿过导电结构的中心时，导电结构的存在会同样影响H x和H y， H x / H y与没有结构的情况相同。因此，在那些配置中不会发生方位误差。当导电结构未位于方位角矢量上时，该结构对H x和H y的影响不同，当该结构更靠近观察点时，所得的测向误差会更大。

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