Digital range turn-around for tracking, telemetry and control tr

Details Digital range turn-around for tracking, telemetry and control tr Digital range turn-around for tracking, telemetry and control tr

1993-11-26

1995-02-28

Hellner, Mark

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

Directive

Including a satellite

342355, H04B 7185

Patent

active

053941560

ABSTRACT:
A transponder demodulates a phase modulated ranging signal transmitted by an earth station. The transponder converts the analog ranging signal to digital form. The digital ranging signal is demodulated into its I and Q phase components. Next the demodulated ranging signal is re-modulated and digitally combined with a selected transmit frequency. Then the re-modulated ranging signal is converted from digital to analog form. The ranging signal is transmitted to the earth station.

REFERENCES:
patent: 3860421 (1975-01-01), Wood
patent: 4156873 (1979-05-01), Moore
patent: 4809006 (1989-02-01), Dar

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