Instrument landing glide slope
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United States of America Patent
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Feb 5, 2002
Grant Date -
N/A
app pub date -
Jan 20, 1999
filing date -
Jan 20, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
This invention provides an improvement in Glide Slope antenna systems of the earth-image type. The standard antenna usually is mounted on a steel tower located several hundred feet to one side of the runway, considered a safe distance to avoid being struck by an airplane. This invention, however, employs an antenna system using wide aperture slotted cable elements. Frangible construction permits it to be located safely much closer to the runway. The closer spacing, with the wide aperture, provides for a vertical guidance pattern that is narrower in azimuth, resulting in improved quality of guidance. An additional slotted cable, fed only with clearance signal, provides fly-up indication, both sides, over a wider azimuth sector.
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