Two-frequency transmitting apparatus with tone-modulation phasing for an instrument landing system
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United States of America Patent
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Jun 21, 1994
Issued Date -
N/A
app pub date -
Jun 18, 1993
filing date -
Feb 29, 1992
priority date (Note) -
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Abstract
Two-frequency transmitting apparatus (S1, S2, LA) for instrument-landing systems is insensitive to so-called difference in depth of modulation (DDM) distortions caused by reflections of a clearance signal from obstacles (H) located near the runway (RW). This insensitivity is achieved by providing different phase shifts to the equal modulation frequencies (90 Hz and 150 Hz) used for the course and clearance signals. The different phase shifts correspond to a phase shift of a common fundamental frequency (30 Hz). The two-frequency transmitting apparatus can be used to specify a localizer course or a glide path.
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