中波导航台铁塔对天线性能影响分析

Analysis of Influence of Tower on Antenna Performance of Non-Directional Beacon

针对目前机场中波导航台天线阵地占地面积大、维护困难等难题,提出采用自立铁塔代替传统拉线塔。为了准确预测中波导航台铁塔改建前后地面导航天线工作时电性能指标变化,基于FEKO软件对铁塔改建前后两种场景下的天线电性能分别进行了建模与仿真。根据仿真得到的天线方向图和天线增益仿真图像,通过对比和分析,得出了拟建铁塔及地网与现有铁塔及地网对天线的电性能影响基本一致的结论,为铁塔设计与改建方案提供了可靠支撑。通过采集某机场中波导航台铁塔改建前后的实际飞行数据,导航信号误差基本与原拉线塔一致,验证了采用自立铁塔代替传统拉线塔方案的可行性。

Aiming at the problems of large floor area and difficult maintenance of waveguide antenna position in the airport,a self-supporting tower is proposed to replace the traditional stay tower.In order to accurately predict the change of electrical performance index of ground navigation antenna before and after tower reconstruction of non-directional beacon,the electrical performance of antenna in two scenarios before and after tower reconstruction is modeled and simulated based on FEKO software.According to the simulated antenna pattern and antenna gain simulation image,through comparison and analysis,it is concluded that the influence of the proposed tower and ground grid on the electrical performance of the antenna is basically the same as that of the existing tower and ground grid,which provides a reliable support for the tower design and reconstruction scheme.By collecting the actual flight data before and after the reconstruction of the waveguide navigation tower in an airport,the navigation signal error is basically consistent with the original guyed tower,which verifies the feasibility of using the self-supporting tower instead of the traditional guyed tower.