目的 研究地下电磁信号对机场导航台站的干扰机理,并进行仿真计算.方法 建立导航台天线的电流分布模型,研究外部电磁干扰对导航台天线上电流分布形式的影响.基于导航台的工作原理,研究外部电磁干扰对导航台辐射方向图的影响,并进行仿真计算.计算航线下滑线空间点上的场强值受外部电磁信号干扰的影响.结果 地下电磁信号传播至导航台天线所在区域,造成T型天线的左右顶负载的电流不再满足镜像反对称的状态,导致T型天线覆盖区域中的场强值变化,水平面的无方向性方向图产生波瓣分裂,进而导致航线下滑线上空间点接收到的场强值幅度产生波动,仿真结果显示波动值高达32.7%.结论 地下电磁信号对无方向性信标台造成干扰,导致原来的无方向性方向图产生波瓣分裂,航线下滑线上的场强值产生波动,影响了飞行安全,需要加以抑制屏蔽.%Objective To study interference mechanism of underground electromagnetic signal to airport navigation station and carry out simulation calculation.Methods Distributed current model on antenna of navigation station was es-tablished. Influences of external electromagnetic interference on distributed current form were analyzed. Based on radia-tion principle of airport navigation station, influences of external electromagnetic interference on navigation station radi-ation pattern were studied and simulated, and influence of external electromagnetic interference on E-filed amplitude at route glide line were calculated.Results Underground electromagnetic signal propagated to the area of the airport naviga-tion station antenna and caused that top load currents on both sides of the T-type antenna no longer satisfy the mir-ror-antisymmetric state. Field intensity in the field covered by T-antenna also changed. Radiation lobe splitting appeared in the non-directional diagram at horizontal plane and field intensity range received at the spatial point of air line glide
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