Method for preventing bias-errors as a result of synchronous...

Details Method for preventing bias-errors as a result of synchronous... Method for preventing bias-errors as a result of synchronous...

2007-03-13

2007-03-13

Lee, Hwa (Andrew) (Department: 2877)

Optics: measuring and testing

By light interference

Rotation rate

C356S460000

Reexamination Certificate

active

10481945

ABSTRACT:
The method according to the invention for preventing bias errors as a result of synchronous interference in fiber-optic gyroscopes (FOGs) provides for an additional signal φE, which is periodical at the sampling clock rate and corresponds, for example, to a synchronous interference signal input to be added in the form of additional modulation to the modulation signal for a phase modulator within an MIOC. The demodulated detector signal from the FOG is preferably then correlated with the additional modulation, that is to say which is multiplied by the additional modulation and is added to it. The added-up signal, which is dependent on the error matching, controls a VCO (12) which readjusts the operating frequency of the FOG until the correlation tends to zero. The method can be used not only for phase ramp modulation but also for FOGs which operates using a random phase modulation method.

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