| 摘要 |
A technique for operating an interferometric fiber optic gyroscope (IFOG) exploits digital intensity suppression to improve gyro performance. The IFOG [200] includes an optical portion configured to provide an optical signal [102], a photodetector [206] configured to convert the optical signal to a photodctcctor output signal [217] and an electronics portion [207] configured to provide a gyro output [260] based upon the photodetector output signal. The photodetector output signal is quantized [214] to create a digitized representation [241] of the optical signal. An intensity scaling value [245] is determined based upon the digital representation of the optical signal, and the photodetector output signal is adjusted based upon the intensity scaling value to create a scaled photodetector output signal. The digital representation of the optical signal is then digitally reconstructed [248] as a function of the scaled photodetector output signal and the intensity scaling value. From the reconstructed signal, a demodulation technique [250] is applied that removes the intensity-sensitivity while preserving the sensitivity to rotation rate. The gyro output or servo feedback [262] in a closed-loop system is thereby based upon the intensity-suppressed demodulated digital representation of the reconstructed optical signal.
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