Digital range turn-around for tracking, telemetry and control transponder
AssigneeMotorola, Inc.
InventorsLansing M. Carson, Dean J. Boman
Life of this patent
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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.
Claims20
A digital ranging arrangement for a tracking, telemetry and control transponder comprising:
- analog/digital converter means for converting a received ranging signal in analog form to a digital ranging signal;
- demodulator means for digitally converting said digital ranging signal to a digital baseband signal, said demodulator means coupled to said analog/digital converter means;
- modulator means for digitally converting said digital baseband signal to a re-modulated ranging signal in digital form, said modulator means coupled to said demodulator means;
- and
- digital/analog converter means for converting said re-modulated ranging signal in digital form to analog form, said digital/analog converter means coupled to said modulator means.
A digital ranging arrangement for a tracking, telemetry and control transponder comprising:
- an analog/digital converter for converting a received ranging signal in analog form to a digital ranging signal;
- a demodulator for digitally converting said digital ranging signal to a digital baseband signal, said demodulator coupled to said analog/digital converter;
- a modulator for digitally converting said digital baseband signal to a re-modulated ranging signal in digital form, said modulator coupled to said demodulator;
- and
- a digital/analog converter for converting said re-modulated ranging signal in digital form to analog form, said digital/analog converter coupled to said modulator.
A digital ranging system for tracking, telemetry and control of a satellite by an earth station, said digital ranging system comprising:
- said earth station for transmitting a ranging signal;
- said satellite including:
- converter means for receiving said ranging signal;
- analog/digital converter means for converting said received ranging signal to a digital ranging signal;
- demodulator means for digitally converting said digital ranging signal to a digital baseband signal, said demodulator means coupled to said analog/digital converter means;
- modulator means for digitally converting said digital baseband signal to a re-modulated ranging signal in digital form, said modulator means coupled to said demodulator means;
- digital/analog converter means for converting said re-modulated ranging signal in digital form to analog form, said digital/analog converter means coupled to said modulator means;
- and
- transmitter means for transmitting said analog form of said re-modulated ranging signal to said earth station.
Dependencies are inferred from the claim text.