グライドパスに対する構造物・地形の影響について
1982 年 1982 巻 38 号 p. 1-14
詳細
1982 年 1982 巻 38 号 p. 1-14
A major problem with Instrument Landing System (ILS) Glide Slope is the scattering effects of structures and uneven terrain, since the Glide Slope system always radiates horizontally wide UHF wave and utilizes its ground image.
In this paper a mathematical model based on physical optics is studied to pridict the performance of the Glide Slope in the three siting problems; (1) with structure scattering, (2) with rough ground surface, and (3) with severe dropoff.
Comparisons of deviation currents are made between computed values and measured values, which were obtained in anechoic chamber test with a scale model of null-reference array and in flight tests with null-reference, quadrature and capture-effect types.
The results have yielded comparatively good agreement, whose relative error is (-4±26)% at maximum deviation current. This indicates that the mathematical model developed here can be applied for a prediction of the ILS Glide Slope performance.
