From the actual perspective of working principle of localizer beacon subsystem of Instrument Landing System (ILS), consideration of the distance information from localizer antenna to field monitor antenna and wide ape...From the actual perspective of working principle of localizer beacon subsystem of Instrument Landing System (ILS), consideration of the distance information from localizer antenna to field monitor antenna and wide aperture effect of localizer antenna, broke through the limitation of signals synthesized only far-field (FF), established the near-field (NF) model. The three-dimensional mathematical model of localizer beacon was designed, and the signals at both near-field and far-field were analyzed qualitatively. At the environment of Antenna Fault as well as Antenna Distribution Unit (ADU) phase shifter simulation, the characteristics of near-field and far-field were also compared. The simulation results showed that the model met the requirement of theory of localizer beacon, and the gap between two models was so evident, which resulted from the broken geometric symmetry in NF area. The model could provide valuable theoretical basis for performance evaluation and maintenance of the ILS, and meanwhile, provide reference for the further analysis of localizer beacon.展开更多
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...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。展开更多
文摘From the actual perspective of working principle of localizer beacon subsystem of Instrument Landing System (ILS), consideration of the distance information from localizer antenna to field monitor antenna and wide aperture effect of localizer antenna, broke through the limitation of signals synthesized only far-field (FF), established the near-field (NF) model. The three-dimensional mathematical model of localizer beacon was designed, and the signals at both near-field and far-field were analyzed qualitatively. At the environment of Antenna Fault as well as Antenna Distribution Unit (ADU) phase shifter simulation, the characteristics of near-field and far-field were also compared. The simulation results showed that the model met the requirement of theory of localizer beacon, and the gap between two models was so evident, which resulted from the broken geometric symmetry in NF area. The model could provide valuable theoretical basis for performance evaluation and maintenance of the ILS, and meanwhile, provide reference for the further analysis of localizer beacon.
文摘仪表着陆系统(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。
