DETERMINING AND COMPENSATING FOR MODULATOR DYNAMICS IN INTERFEROMETRIC FIBER-OPTIC GYROSCOPES

• US 20110102801A1
• Filed: 12/09/2010
• Published: 05/05/2011
• Est. Priority Date: 01/22/2007
• Status: Active Grant

• Current Assignee: Charles Stark Draper Laboratory Incorporated
• Original Assignee: Charles Stark Draper Laboratory Incorporated
• Inventors: Kishinevsky, Michael, Soucy, Matthew, Smith, Stephen P., Ward, Paul A., Zarinetchi, Farhad
• Granted Patent: US 8,102,536 B2
• Time in Patent Office: Days
• US Class Current: 356/460
• CPC Class Codes: G01C 19/726 Phase nulling gyrometers, i.e. compensating the Sagnac phase shift in a closed loop system

Abstract

Determining linear modulator dynamics in an interferometric fiber-optic gyroscope may be accomplished by applying a stimulus at a point within the gyroscope, observing a response in an output of the gyroscope, and determining, from the observed response, the linear modulator dynamics.

Claims

1-17. -17. (canceled)

18. An interferometric fiber-optic gyroscope, comprising:

a phase modulator; and

a means for pre-filtering a drive signal before it drives the phase modulator, thereby compensating for linear modulator dynamics present in the interferometric fiber-optic gyroscope.

19. The interferometric fiber-optic gyroscope of claim 18 further comprising a means for determining a transfer function of the phase modulator.

20. The interferometric fiber-optic gyroscope of claim 19, wherein the means for pre-filtering the drive signal multiplies the drive signal by an inverse of the transfer function.

21. The interferometric fiber-optic gyroscope of claim 18, wherein the means for pre-filtering the drive signal is a digital pre-emphasis filter.

22. A method for compensating a frequency-dependent complex gain of a phase modulator, comprising:

applying a first signal to a phase modulator located within an interferometric fiber-optic gyroscope;

determining a transfer function of the phase modulator based, at least in part, on a response in an output of the interferometric fiber-optic gyroscope to the first signal; and

multiplying a drive signal of the phase modulator with an inverse of the transfer function.

23. An interferometric fiber-optic gyroscope, comprising:

a phase modulator; and

a means for multiplying a drive signal for the phase modulator with an inverse of a transfer function of the phase modulator before the drive signal drives the phase modulator, thereby compensating for linear modulator dynamics present in the interferometric fiber-optic gyroscope.

24. The interferometric fiber-optic gyroscope of claim 23 further comprising a means for determining the transfer function of the phase modulator.