Two-frequency transmitting apparatus with tone-modulation phasin

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

1993-06-18

1994-06-21

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

G01S 116, G01S 118

Patent

active

053231651

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.

REFERENCES:
patent: 3887922 (1975-06-01), Hofgen et al.
Herausgegeben von Ernst Kramar; "Funksysteme fur Ortung und Navigation"; 1973; pp. 197-209; published by Verlag Berliner Union GmbH Stuttgart, and Verlag W. Kohlhammer GmbH, Stuttgart Berlin Koln Mainz.

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