The Instrument Landing System: 
Replace it, or Repair it?

Watts, C. B.

doi:10.1017/s0373463399008449

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…In this paper, the near field signal distribution of the 7220A Localizer Beacon Subsystem of the instrument landing system (ILS) [4]. There are three kinds of curves of coverage distribution, tested curve, calculated one and revised curve.…”

Section: Introductionmentioning

confidence: 99%

Research on Near Field Signal Behaviour of Localizer Antenna System

2023

J. Phys.: Conf. Ser.

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Near-field (NF) signal distribution behavior with a radius of 150 meters was studied to compare with far-field (FF) distribution characteristics. It can be found more flexible and detailed in NF than the signal from an NF monitor with only a single location. The origin of the measured value and signal detection method on the equipment was introduced in detail. The three-dimensional model was established and optimized by phase analysis as well as the measured data on-site. There was little difference between a measured distribution and a theoretical calculation in space. The change of directional weakening of the Log Periodic Dipole Antenna (LPDA) was proposed. Unequal amplitude signal synthesis together with Fresnel loss was considered to research and explain the incredible power gain. The modified 3D model is in good agreement with the measured results.

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Section: Introductionmentioning

confidence: 99%

Research on Near Field Signal Behaviour of Localizer Antenna System

2023

J. Phys.: Conf. Ser.

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“…The Instrument Landing System (ILS) had its beginnings in the United States and England during the years 1939 to 1945 [1]. Since then, ILS became the international standard system for approach and landing guidance.…”

Section: Introductionmentioning

confidence: 99%

Research on Signal of Field Monitor of 7220A Localizer Beacon Subsystem of ILS

Qu¹

2015

OJAPr

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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.

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The Instrument Landing System: Replace it, or Repair it?

Cited by 2 publications

References 4 publications

Research on Near Field Signal Behaviour of Localizer Antenna System

Research on Near Field Signal Behaviour of Localizer Antenna System

Research on Signal of Field Monitor of 7220A Localizer Beacon Subsystem of ILS

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