| 摘要 |
In an azimuth reference system including a flux valve coupled to a synchro stator and a directional gyro having its outer gimbal mechanically coupled to the synchro rotor, a low power electronic slaving circuit having its input electrically coupled to the rotor of the synchro and its output coupled to a torquer for slaving the directional gyro into synchronism with the flux valve. The low power electronic circuit includes a phase compensated amplifier coupled between the synchro rotor and a demodulator for producing a bipolar slaving error signal which is coupled through a high gain amplifier to parallel connected coils in the torquer. A threshold detector circuit responsive to the speed of the gyro rotor controls a limiter feedback circuit in the high gain amplifier thereby limiting its gain when the gyro rotor has attained a predetermined speed. A null sensor circuit coupled between the output of the high gain amplifier and the threshold detector circuit senses the output magnitude of the amplifier voltage and inhibits the threshold detector circuit until the magnitude of the output voltage from the high gain amplifier is below a prescribed value thereby indicating the gyro is substantially synchronized with the flux valve. |
