design notch filter to increase bandwidth in a hemispherical resonator gyroscope

Vibratory gyroscopes with hemispherical resonators are among the new electromechanical gyroscopes that have advantage of bias stability and insensitive to external environmental perturbations like vibrations, accelerations and shocks.Due to the dynamic model, symmetrical structure and high quality coefficient of the oscillator, one of the challenges of vibrating gyroscopes with symmetrical oscillator is the limitation of the dynamic opening of the input frequency. In this paper, by limiting the design of the filter, the dynamic opening limitation of the input frequency is removed by an innovative method. Then, by processing the output signal of the filter, a model for measuring the rotational speed is designed. This design shows the effect of the bottom receiving filter on the size line. By designing the filter, the dynamic range of the input frequency in the gyroscope has been increased from 3 to 100 Hz. With the proper design of the lower filter, the accuracy of the rotation speed measurement line increases to 0.05%.