Improved fiber optic gyroscope dead band avoidance device and method

摘要

PROBLEM TO BE SOLVED: To suppress increase of noise due to residual dither signals generated in saturation of a gyro control loop.;SOLUTION: A fiber optic gyroscope signal process dither system permits application of a low amplitude dither signal for many sampling periods without increasing the noise in the sampled outputs due to residual dither signals. A dither loop and an accumulator are added to a closed loop fiber optic gyroscope rotation sensing system. The dither loop has a delay and a gain that are adjusted to match the gain and delay of the fiber gyro loop. A zero mean dither of amplitude sufficient to break up the dead band is injected into to a gyro and the dither loop. The dither loop filters the dither signal in the same manner as the gyro loop to provide a signal that is input to a differentiating circuit to remove the dither signal from an output of the gyro.;COPYRIGHT: (C)2008,JPO&INPIT