Whole Angle Mode Hemispherical Resonant Gyroscope Lock-in Suppression Method Based on Rotation Modulation
The whole angle mode hemispherical resonant gyroscope has the characteristics of wide measurement range,small size,high reliability and low cost,and has a wide range of application prospects in land,sea,air,space and other fields.Due to the unavoidable geometric errors and damage of the gyrometer head,it leads to large losses and uneven distribution of the circumferential damping of the meter head,which will lead to the locking area of the gyroscope and affect the application of the gyroscope.On the basis of analyzing the influence of damping inhomogeneity on gyro-locking area,the suppression effect of different rotational modulation schemes such as unidirectional rotation,square wave,triangular wave and sine wave on gyro-locking area is studied.A dual-axis rotation test platform is built,and tests such as the detec-tion of the Earth's rotation angle rate,the nonlinearity of the scale factor and the detection of the lock area are carried out for the gyroscope prototype of the 0.1 mHz damping inhomogeneity.The experimental results show that the new swing rota-tion modulation lock area suppression method reduces the gyro lock area from 38(°)/h to below 0.048(°)/h,which lays a foundation for the engineering application of hemispherical resonant gyroscope in whole angle mode.
whole angle modenon-uniform dampingvirtual rotationnew lock out scheme
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