Patent ID: 6131297
Filing Date: 2000-10-17
Classification: G01C

Abstract:
A gyrocompass comprising;a gyro case containing therein a gyro rotor having an approximately horizontal spin axis,a container for surrounding said gyro case and for accommodating liquid therein,first supporting means for supporting said gyro case within said container,second supporting means for supporting said container with a freedom of three axes,an azimuth follow-up loop for causing said container to follow said gyro case about a vertical axis,a damping loop for applying a torque proportional to inclination angle of said spin axis of gyro rotor relative to a horizontal plane to said gyro case about a vertical axis,and a substantially first-order lag filter being provided in said azimuth follow-up loop or said damping loop,said substantially first-order lag filter having a time constant T.sub.F which is approximately equal to a ratio C/k.sub.T of the viscosity torque coefficient C to the twisting torque coefficient k.sub.T of the torque produced between said container and said gyro case.