Patent ID: 10365102

Abstract:
A compact Inertial Wave Angle Gyroscope (IWAG) is disclosed without zero rate drift due to residual asymmetry comprises antisymmetric velocity feedback of sufficient magnitude to produce a continual self-precession of its vibration pattern to overcome any rate threshold and average the effects of its residual asymmetry on zero rate drift to zero over each revolution of the precession pattern in the case. The inertial rotation input is determined from the measured total precession rate by removing the computed self-precession rate. A compact, low power, IWAG electronics design suitable for an ASIC collocated with the MEMS resonator comprises analog electronic feedback for self-precession, amplitude and quadrature control and asymmetry correction and analog inertial rate output that is digitally-assisted by intermediate frequency processing for control offset correction, residual asymmetry parameter identification for analog feedback gain correction and electrostatic tuning bias correction and compensated digital inertial rate output.