Modulated range tone system

Details Modulated range tone system Modulated range tone system

1990-10-31

1992-07-07

Blum, Theodore M.

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

Transmitting intelligence

342352, G01S 1300

Patent

active

051286807

ABSTRACT:
A range tone system for determining the range between a satellite or spacecraft and a ground station FM modulates one of a 3968 Hz, 283 Hz or 35 Hz range tone onto a 27.77 Khz range tone. Modulation is accomplished by simultaneously addressing a plurality of PROMs by related clocks. The PROMs are preprogrammed with data representing the 27.77 KHz tone frequency-modulated by another range tone. Narrow-band filtering recovers the 27.77 KHz range tone from the received signal, and frequency demodulation coupled with narrowband filtering recovers the lower-frequency tone. The two recovered tones are processed simultaneously to provide both high resolution range information together with ambiguity resolution.

REFERENCES:
patent: 3763492 (1973-10-01), Easton
patent: 3769589 (1973-10-01), Buntschuh et al.
patent: 4584541 (1986-04-01), Nossen
patent: 4628286 (1986-12-01), Nossen
patent: 4704574 (1987-11-01), Nossen

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