Gyrocompass

In a gyrocompass having a gyro rotor, a gyro case for said gyro rotor, a support means for suspending the gyro case in the direction of gravity for north-seeking action, a servo means for causing said supporting means to track said gyro case about the direction of gravity, detection means for detecting a deviation angle of the gyro spin axis from a generally horizontal plane, circuit means coupled to an output of said detection means for developing a control signal to be applied to said servo means to produce an angular offset thereof, said circuit means having a transfer function for developing a signal to produce an offset substantially in proportion to the output of said detection means a component of said output which varies at a rate similar to the period of the north-seeking action of the gyro case and for producing a substantially zero offset for a constant level component of said output.

In a gyrocompass having a gyro rotor, a gyro case for said gyro rotor, a support means for suspending the gyro case for north-seeking action, means for detecting a deviation angle of the gyro spin axis from a horizontal plane, means for applying a torque to said gyro case about its vertical axis in accordance with the output of said detecting means, electronic transfer means for applying the output of said detecting means to said torque means, said transfer means causing said torque to be substantially in proportion to said detecting means output for a component thereof which varies with an oscillation period similar to that of the north-seeking action of the gyro case and also causing said torque to approach zero as said gyro rotor settles to a constant inclination angle.