交流特高压输电线路对航空无线电导航台站的有源干扰计算

分析了交流特高压输电线路的无线电干扰产生机理、频率特性和横向衰减特性,描述了中波导航台的工作方式。结合中波导航台引导飞机进场着陆轨迹和交流输电线路无线电干扰限值，计算了特高压输电线路对中波导航台–无线电罗盘导航系统的有源干扰。结果表明，从有源干扰角度考虑，取防护率15dB，在距航空无线导航台天线中心38.9 km内均可架设特高压输电线路，远近距导航台间任意点均可架设特高压输电线路。

Calculation of Active Interference in Aeronautical Radionavigation Stations Caused by UHVAC Transmission Line

The production mechanism of radio interference caused by UHVAC transmission lines, its frequency characteristic and transverse attenuation characteristic are analyzed. The operation modes of non-directional beacon are described. Combining the path of bringing airplane in for landing by non-directional beacon with the limit value of radio interference caused by AC transmission line, the active interference caused by UHVAC transmission line in non-directional beacon-radio compass navigation system is calculated. Calculation result shows that from the standpoint of active interference and taking 15dB as protection ratio, UHVAC transmission line can be erected in the region that is away from the antenna center of aeronautical radio navigation station by 38.9 km as well as in arbitrary position between inner locator and outer locator.