Tone based command system for reception of very weak signals

Details Tone based command system for reception of very weak signals Tone based command system for reception of very weak signals

2006-11-21

2006-11-21

Urban, Edward F. (Department: 2618)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S431000, C455S267000, C455S255000, C340S870030, C340S870260, C244S158100

Reexamination Certificate

active

07139567

ABSTRACT:
This disclosure presents a communication receiver system for spacecraft that includes an open loop receiver adapted to receive a communication signal. An ultrastable oscillator (USO) and a tone detector are connected to the open loop receiver. The open loop receiver translates the communication signal to an intermediate frequency signal using a highly stable reference frequency from the USO. The tone detector extracts commands from the communication signal by evaluating the difference between tones of the communication signal.

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G. Lanyi and R. Kahn, “Tone Detection Via Incoherent Averaging of Fourier Transforms to Support the Automated Spacecraft-Monitoring Concept,” Telecommunications and Data Acquisition (TDA) Progress Report 42-129, May 15, 1997 (published by the Jet Propulsion Laboratory).

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