Rate gyroscope, a two-degree-of-freedom gyro device for directly measuring the angular velocity of a carrier. The outer ring of the equalization gyroscope is fixed to the carrier and the inner ring axis is perpendicular to the axis at which the angular rate is to be measured. As the carrier rotates around the measuring axis at an angular velocity along with the outer ring, the gyro moment will force the inner ring to be precessed with the rotor along with the rotor. A spring in the gyroscope limits this relative precession, and the precession angle of the inner ring is proportional to the amount of deformation of the spring. The gyro moment and the angular velocity of the carrier can be obtained from the inner ring precession angle at equilibrium. The difference between an integral gyroscope and a rate gyroscope is that a linear damper is used instead of a spring constraint. When the carrier rotates at any variable speed, the output of the integrating gyro is the angle of rotation around the measuring axis (ie, the integral of the angular velocity). The above two kinds of gyroscopes are used more in remote measuring systems or automatic control and inertial navigation platforms.
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