Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Reexamination Certificate
2007-05-29
2007-05-29
Ha, Dac (Department: 2611)
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
C375S215000, C375S294000, C375S373000, C375S375000, C375S376000, C375S327000
Reexamination Certificate
active
10193416
ABSTRACT:
An apparatus eliminates a differential phase shift, Δθ(f), between a double sideband suppressed carrier modulated angular rate information signal and its sinusoidal demodulation reference signal in a gyroscope angular rate sensing circuit including a signal reference source. The apparatus includes a demodulator, a phase shifter in a demodulation reference signal path, the demodulation reference signal path being between the signal reference source and the demodulator. The phase shifter is configured to adjust a phase of the sinusoidal demodulation reference signal. A phase locked loop (PLL) includes a phase detector, a servo equalizer, and a dual-frequency, numerically controlled oscillator. The PLL is configured to provide a demodulation signal based on the phase shifted demodulation reference signal, and a phase shift command source is configured to provide an input to the phase shifter to command an appropriate phase adjustment.
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International Search Report dated Dec. 19, 2003, Application No. PCT/US03/22004, 6 pages.
Roden, Martin S., Analog and Digital Communication Systems, 4thedition, Prentice-Hall, Inc., Upper Saddle River, NJ, pp. 470-523.
Abeyta, Esq. Andrew
Armstrong Teasdale LLP
Ha Dac
Honeywell International , Inc.
Wang Ted M.
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