Influence of Unconventional Erect Counterpoise on Radiation Performance of DVOR System
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摘要: 地网是多普勒甚高频全向信标(Doppler very high frequency omni-directional range, DVOR)天线系统的重要组成部分,其常规架高及直径分别为5 m左右和30.5 m。随着城市化进程的持续推进,越来越多DVOR台站的环境正在急剧恶化,一些民航单位尝试将地网架高和地网直径同时增大,以减少周围建筑物对DVOR信标辐射性能的影响,但这些非常规架设地网对DVOR台辐射特性的影响缺乏理论分析,对这类地网的架设缺乏理论指导。结合DVOR系统的天线特征及馈电特点,基于物理光学法获得了包括直射场、地面反射场及地网散射场在内的DVOR辐射场,在此基础上,依据国际民航组织(International Civil Aviation Organization,ICAO)“附件10”的要求,给出了非常规架设地网时DVOR顶空盲区,以及不同飞行高度所对应的最远水平作用距离之内场强分布的求解方法,并进行了相应仿真实验。实验结果表明,若地网直径保持常规的30.5 m,对于非常规架高地网的DVOR信标,其垂直辐射特性不会出现多瓣现象,顶空盲区不会受到影响,在ICAO规定的不同飞行高度所对应最远水平作用距离之内的场强大小满足要求;但当地网架高增大到大于等于30 m时,即使将地网直径增大到50 m,也难以满足“附件10”规定的水平覆盖场强要求。研究成果可为非常规架设地网DVOR信标台的建设提供相应理论支持。
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关键词:
- 多普勒甚高频全向信标 /
- 地网 /
- 辐射特性 /
- 场强
Abstract: The counterpoise is an important component of the Doppler very high frequency omnidirectional range (DVOR) antenna system, with a conventional height and diameter of approximately 5 m and 30.5 m respectively. With the continuous development of urbanization, the environment of DVOR beacons is rapidly deteriorating. Some civil aviation units are attempting to increase the height and diameter of the counterpoise simultaneously to reduce the impact of surrounding buildings on the radiation performance of DVOR beacons. However, there was a lack of theoretical analysis of the impact of these unconventional counterpoise on the radiation characteristics of DVOR beacons, and there was lack of theoretical guidance for the installation of such counterpoise. Based on the antenna characteristics and feeding characteristics of the DVOR system, the DVOR radiation electric field, including direct radiation electric field, ground reflection electric field, and counterpoise scattering electric field, was obtained using physical optics method. On this basis, according to the requirements of Annex 10 of the International Civil Aviation Organization (ICAO), the DVOR beacon upper space of silence during unconventional counterpoise installation was given, And the solution method for the electric field strength distribution within the farthest horizontal coverage distance corresponding to different flight altitudes, and corresponding simulation experiments were conducted. The experiment results showed that if the diameter of the counterpoise is maintained at a conventional 30.5 m, the vertical radiation characteristics of DVOR beacons with unconventional high counterpoise will not exhibit multi lobe phenomenon, and the upper space of silence will not be affected. The field strength within the farthest horizontal radiation distance corresponding to different flight heights specified by ICAO meets the requirements; But when the counterpoise height increases to 30 m or more, even if the diameter of the counterpoise is increased to 50 m, it is difficult to meet the horizontal coverage field strength requirements specified in Annex 10. The research results can provide corresponding theoretical support for the construction of unconventional counterpoise DVOR beacons. -
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表 1 顶空盲区仰角范围的统计结果
Table 1 Statistics results of elevation range of upper space of silence
地网架高h/m 10 20 30 40 50 60 70 80 90 100 飞行高度hM /m 顶空盲区仰角范围 3000 73°~90° 4000 72°~90° 5000 72°~90° 6000 72°~90° 表 2 图12(a)和(b)中场强值低于90 μV/m的数据点坐标
Table 2 Coordinates of points with field strength values below 90 μV/m in figure 12(a) and (b)
hM /m 数据点坐标 3000 (40,5.68×10-5) 4000 (50,3.05×10-5)、(55,6.02×10-5) 5000 (60,5.11×10-5)、(65,2.03×10-5)、(70,5.55×10-5)、(75,8.36×10-5) 6000 (70,6.18×10-5)、(75,2.12×10-5)、(80,2.62×10-5)、(85,5.07×10-5)、(90,6.97×10-5)、(95,8.32×10-5) 表 3 图13(a)和(b)中场强值低于90 μV/m的数据点坐标
Table 3 Coordinates of points with field strength values below 90 μV/m in figure 13(a) and (b)
hM /m 数据点坐标 3000 (40,5.71×10-5) 4000 (50,3.19×10-5)、(55,6.03×10-5) 5000 (60,5.24×10-5)、(65,2.10×10-5)、(70,5.55×10-5)、(75,8.36×10-5) 6000 (70,6.28×10-5)、(75,2.22×10-5)、(80,2.64×10-5)、(85,5.07×10-5)、(90,6.97×10-5)、(95,8.33×10-5) 表 4 图14(a)和(b)中场强值低于90 μV/m的数据点坐标
Table 4 Coordinates of points with field strength values below 90 μV/m in figure 14(a) and (b)
hM /m 数据点坐标 3000 (50,1.92×10-5)、(55,7.07×10-5) 4000 (60,8.49×10-5)、(65,2.58×10-5)、(70,2.89×10-5)、(75,6.10×10-5)、(80,8.41×10-5) 5000 (75,6.91×10-5)、(80,2.95×10-5)、(85,1.23×10-5)、(90,3.34×10-5)、(95,5.23×10-5) 6000 (90,5.83×10-5)、(95,3.01×10-5)、(100,1.05×10-5)、(105,1.81×10-5) -
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