Redundant information processing techniques comparison for differential vibratory gyroscope
Advantages of differential Coriolis vibratory gyroscope of the new type with two measuring channels of angle rate with opposite signs that provides redundant measuring information about angle rate are analyzed. Comparative analysis of four different techniques of redundant signals processing including technology of “virtual” gyro signals processing in application to the differential vibratory gyroscope is carried out.Importance of creation of redundant information processing techniques is caused by distinction of the differential vibratory gyroscope from other micro-electro-mechanical gyros, for example, tuning fork gyro, in that it has two output signals, which come from the single resonator and correspond to angle rates with opposite signs.As a result redundant output information processing tech- niques were obtained. This information comes from the differential vibratory gyroscope output and is formed by subtracting of two measuring channel signals. The algorithm of “virtual” gyro redundant output information processing was modified. The algorithm differs from known ones by calculation of inter-channel correlation matrix in on-line manner. This leads to decrease of angle rate measuring random error and to decrease overshoot in conditions of abrupt change of angle rate.The obtained results are important and useful for application of differential vibratory gyroscopes in stabilization systems and angular motion control. This is caused by high requirements to accuracy and ability to function in hash environment.