Systems Engineering and Electronics ›› 2023, Vol. 45 ›› Issue (2): 360-372.doi: 10.12305/j.issn.1001-506X.2023.02.05

• Electronic Technology • Previous Articles    

Setting the sensitive area of localizer under the influence of large obstacles

Yude NI1, Yingli YU1, Ruihua LIU1,*, Zhe QIN2, Kai WANG1   

  1. 1. College of Electronic Information and Automation, Civil Aviation University of China, Tianjin 300300, China
    2. Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China
  • Received:2021-10-25 Online:2023-01-13 Published:2023-02-04
  • Contact: Ruihua LIU

Abstract:

The suggestions on the sensitive area of the localizer (LOC) of the instrument landing system are given by the International Civil Aviation Organization, but the influence of large obstacles is not considered, and the corresponding theoretical explanation is not provided. The operation level of the instrument landing system is being upgraded by the Civil Aviation Administration of China, so it is necessary to assess the influence of large buildings on this sensitive area. Focusing on the difference in depth of modulation (DDM) of the signal received by airborne LOC, the influence of LOC reflection signals, edge diffraction signals, and tip diffraction signals generated by large obstacles on DDM is analyzed and studied, DDM calculation model is established based on 20 elements double-frequency LOC array antenna, and the influence of large obstacles made of iron and cement on DDM at different positions is simulated and analyzed. The LOC sensitive area under the influence of large obstacles is obtained. The corresponding suggestions are provided for the modification of a hangar near a category Ⅲ runway in China.

Key words: instrument landing system, localizer (LOC), difference in depth of modulation (DDM), uniform geometric theory of diffraction, multipath interference

CLC Number: 

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