Analysis and Application Verification of Difference in Depth of Modulation of Instrument Landing System
胡小龙 1高振兴 1丁旋 2严福斌3
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作者信息
1. 南京航空航天大学,江苏 南京 211000
2. 特励达易图威科技(北京)有限公司,北京 100000
3. 中国国际航空公司湖北分公司,湖北 武汉 430000
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摘要
仪表着陆系统(Instrument Landing System,ILS)对飞机进近着陆安全起到基础性保障作用.研究航迹偏离刻度(DOT)、调制度差(Difference in Depth of Modulation,DDM)与航迹偏离角三者间的关系可以进一步量化DOT,显示DDM与真实航迹偏离角的数量关联,为飞行事故调查提供量化依据.基于仪表着陆系统原理建立了ILS数字化波形仿真模型;并通过飞行数据进行回归分析,对国内某机场04R跑道的ILS信号进行实例分析,求解了飞机进近阶段DOT、DDM与航迹偏离角间的定量关系;同时讨论了影响飞机进近安全的次级下滑道现象,为飞行数据分析提供了可行的量化计算方法.
Abstract
It is crucial to note the fundamental role played by the Instrument Landing System(ILS)in ensuring aircraft approach and landing safety.There exists a need to study the relationship between Track Deviation Scale(DOT),Difference in Depth of Modulation(DDM),and track deviation angle.This study aims to further quantify DOT,demonstrate the quantitative correlation between DDM and actual track de-viation angle,and establish a quantitative basis for investigating flight accidents.It establishes a digital waveform simulation model for ILS based on its principle,conducts regression analysis of flight data,and exemplifies with the ILS signal of runway 04R at a domestic airport.By solving the quantitative relation-ship between the aircraft's approach phase DOT,DDM,and track deviation angle,it delves into the sec-ondary glide slope phenomenon affecting aircraft approach safety.This paper provides a feasible quantita-tive calculation method for flight data analysis.
关键词
仪表着陆系统/调制度差/航迹偏离角/飞行数据
Key words
instrument landing system/difference in depth of modulation/track deviation angle/flight data
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