Method for reducing random walk in fiber optic gyroscopes

Details Method for reducing random walk in fiber optic gyroscopes Method for reducing random walk in fiber optic gyroscopes

G - Physics

01

C

G01C 19/72 (2006.01)

Patent

CA 2173871

A method for modulating a fiber optic gyroscope achieves a reduction in output noise beyond that possible through increased peak power with conventional phase modulation. A periodic modulation waveform is applied to an electro-optic modulator, such as an MIOC, to induce a periodic phase shift .PHI.M(t) where the form of the periodic phase shift is chosen such that the gyro random walk is below that associated with maximum output signal modulation.

Cette invention concerne un procédé de modulation de gyroscope à fibre optique qui permet d'effectuer une réduction des bruits de sortie plus efficace que celle obtenue par l'accroissement de la puissance de crête lors d'une modulation de phase traditionnelle. Un signal de modulation périodique (28) est appliqué à un modulateur électro-optique, tel qu'un MIOC, de manière à induire un décalage de phase périodique phi M(t). La forme du décalage de phase périodique est choisie de manière à ce que la marche aléatoire du gyroscope soit inférieure à celle associée à la modulation maximale du signal de sortie.

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