Apparatus and method for GPS-based digital compensation of...

Details Apparatus and method for GPS-based digital compensation of... Apparatus and method for GPS-based digital compensation of...

2006-07-31

2011-10-11

Ha, Dac (Department: 2611)

Pulse or digital communications

Receivers

C375S130000, C375S222000

Reexamination Certificate

active

08036311

ABSTRACT:
An apparatus and method for controlling the communication frequencies of a software controlled radio by using GPS to calibrate one or more local oscillators and compensating within the digital radio processing for the local oscillator inaccuracies. The apparatus and method receives and transmits radio frequency signals and includes an oscillator; a frequency monitor adapted to measure the frequency of the oscillator; a numerically controlled oscillator; and a computer adapted to receive the frequency measurement of the oscillator from the frequency monitor, to calculate an error associated with the oscillator, and to calculate a numerically controlled oscillator setting based on the calculation of the error associated with the oscillator; the numerically controlled oscillator adapted to receive the numerically controlled oscillator setting from the computer.

REFERENCES:
patent: 5528199 (1996-06-01), Dunlop et al.
patent: 5940458 (1999-08-01), Suk
patent: 6307877 (2001-10-01), Philips et al.

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