飞机着陆下滑道与输电线路垂直防护间距分析

Analysis of Vertical Protection Distance between Aircraft Landing Glide Slope and Power Transmission Line

飞机着陆下滑过程中,应与穿越或接近机场飞行区端净空的架空输电线路保持一定的垂直间距,防止对机载导航电子设备干扰。根据不同类别飞机着陆系统的性能和防护指标,分析了无线电干扰程度,并验算了干扰防护率;结合下滑道净空特点和相关标准规定,计算出了下滑道关键点净空要求及防护间距。结果表明:对于双信标着陆系统,下滑道应与架空输电线路保持不小于150 m的垂直间距;对于当前主流使用的仪表着陆系统,应根据下滑信标发射方向和飞行程序计算确定垂直间距,150 m的垂直间距有很大裕度。

During the landing and gliding process of aircraft, enough vertical distance should be maintained from the overhead power transmission line approaching or passing through the end clearway of the flight area, so as to prevent disturbances on airborne navigation electronic equipments. According to various performance and protection levels of different aircraft landing systems, the radio interference level was analyzed and the interference protection ratio was checked. Combined with the characteristic of glide slope distance and related standards, the distance requirement and protection distance of the key points of glide slope was calculated. The result shows that for double-beacon landing system, the vertical distance of 150 m is required between the glide slope and power transmission line, and that for the prevalent meter landing system, the vertical distance should be calculated according to the emitting direction of glide beacon and flight procedure, the 150 m vertical distance is of redundant safety.