Coherent pickup error cancellation device

Details Coherent pickup error cancellation device Coherent pickup error cancellation device

G - Physics

01

C

G01C 19/72 (2006.01)

Patent

CA 2229551

A device for eliminating coherent pickup error in a fiber optic gyroscope. The polarity of the drive signal to the phase modulator of the gyroscope is switched periodically. The scale factor consequently changes. The phase and amplitude of coherent pickup error generated in the gyroscope circuits do not change during the switching. Therefore, nearly all of the coherent pickup error is substracted out of the gyroscope signal during the digital signal processing of the signal.

Dispositif de suppression d'erreur de captage cohérent dans un gyroscope à fibre optique. La polarité du signal de commande destiné au modulateur de phase du gyroscope est commutée périodiquement, ce qui entraîne une modification du facteur d'échelle. La phase et l'amplitude de l'erreur de captage cohérent générée dans les circuits du gyroscope ne changent pas pendant la commutation. Par conséquent, pratiquement la totalité de l'erreur de captage cohérent est soustraite du signal du gyroscope pendant le traitement numérique du signal.

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