| 摘要 |
A self calibrating zero compensation circuit (10) for a fluxgate compass (12) comprising a toroidal core (14); a drive winding (16) coupled to the core (14), and at least one secondary winding (18, 20) coupled to the core (14). A demodulator (22) is coupled to the sensing windings (18, 20) and an intermittently operated drive signal is fed to the drive winding (16). A microprocessor (40) provides alternatingly to the drive winding (16) a drive signal for a first period of time and prevents transmission of the drive signal for a second period of time. During the second period of time, the sensing windings (18, 20) and the demodulator (22) provide an output signal to the microprocessor (40) representing a zero signal reference.
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