Two-frequency transmitting apparatus with tone-modulation...

Details Two-frequency transmitting apparatus with tone-modulation... Two-frequency transmitting apparatus with tone-modulation...

G - Physics

01

S

G01S 1/04 (2006.01) G01S 1/14 (2006.01)

Patent

CA 2097976

- 12 - Abstract Two-Frequency Transmitting Apparatus with Tone-Modulation Phasing for an Instrument Landing System Two-frequency transmitting apparatus (S1, S2, LA) for instrument-landing systems is disclosed which is in- sensitive to DDM (difference in depth of modulation) distortions caused by reflections of the clearance sig- nal from obstacles (H) located near the runway (RW). This insensitivity is achieved by providing different phase shifts of 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. Fig. 1

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