保护区内地形对ILS下滑信标辐射场的影响  

Influence of Terrain in Protected Area on Radiation Field of Glide Slope of ILS

作　　者：倪育德 于颖丽 刘瑞华 NI Yude;YU Yingli;LIU Ruihua(College of Electronic Information and Automation,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学电子信息与自动化学院,天津300300

出　　处：《信号处理》2022年第9期1892-1902,共11页Journal of Signal Processing

基　　金：中央高校基本科研业务费专项基金(ZXH2011C013);国家重点研发项目(2016YFB0502402)。

摘　　要：仪表着陆系统(instrument landing system,ILS)的下滑信标(glide slope,GS)辐射场由GS天线及其对称于地面的镜像天线辐射场形成,辐射场性能受GS天线附近场地影响很大。在GS保护区内,影响其辐射场性能的关键因素主要包括杂草高度、横向坡度以及地形凹凸高度,国内外相应标准对这些因素均给出了严格规定,但没有提供相应理论说明。基于阵列天线理论,在理想情况下建立M型GS辐射场及调制度差(difference in depth of modulation,DDM)的数学模型,然后分别建立在杂草、横向坡度和地形凹凸影响下这种信标的DDM计算模型,仿真分析了在这三个因素影响之下GS辐射场的性能,并与法国民航大学开发的专业软件LAGON的仿真结果进行比对。结果表明,建模仿真的结果与相应标准的规定,以及LAGON的仿真结果具有良好的吻合度,证明所给理论方法及所建算法模型的正确性。研究成果可为ILS相应标准的自主更新或制定,以及具有自主知识产权的ILS性能评估软件的开发提供相应理论支持。The radiation field of glide slope of instrument landing system is formed by the radiation field of glide slope antenna and its mirror antenna symmetrical to the ground,and the radiation field performance is greatly affected by the site near glide slope antenna.In the glide slope protection area of instrument landing system,the key factors that affect the radiation field performance mainly include weed height,terrain slope and terrain roughness.The relevant standards at home and abroad gave strict regulations on these factors,but no corresponding theoretical explanation was provided.Based on the array antenna theory,the mathematical model of M-type glide slope radiation field and difference in depth of modulation was established under ideal conditions,and then the difference in depth of modulation calculation model of the beacon was established under the influence of weeds,terrain slope and terrain roughness.The performance of glide slope radiation field under the influence of these three factors was simulated and compared with the simulation results of LAGON,a professional software developed by Ecole Nationale de l′Aviation Civile of France.The results showed that the modeling simulation results were in good agreement with the provisions of the corresponding standards and the simulation results of LAGON.The research results can provide theoretical support for the independent update or formulation of instrument landing system standards and the development of instrument landing system performance evaluation software with independent intellectual property rights.

关 键 词：仪表着陆系统 下滑信标 调制度差 阵列天线 

分 类 号：V249.3[航空宇航科学与技术—飞行器设计]