FOG provides extremely precise rotational rate information, in part because of its lack of cross-axis sensitivity to vibration, acceleration, and shock. Unlike the classic spinning-mass gyroscope, the FOG has no moving parts and doesn't rely on inertial resistance to movement. Hence, this is one alternative to the mechanical gyroscope. Because of their intrinsic reliability, FOGs are used for high performance space applications.
FOGs are implemented in both open-loop and closed-loop configurations.
FOGs requires calibration (determining which indication corresponds to zero angular velocity) while ring laser gyroscopes do not (zero beat frequency always means zero angular velocity).
FOG are somewhat sensitive to vibrations while ring laser gyroscope are not.
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