Calibration and verification system and method for directional sensor

A method for calibrating and verifying a directional sensor with a calibration and verification system, the method comprising:

• 1) Calibrating a horizontal attitude of a heating calibration turntable using a level meter;
• wherein the heating calibration turntable is disposed in a first triaxial Helmholtz coil, wherein the first triaxial Helmholtz coil is connected to an industrial control computer which is also connected to a sensor signal acquisition system and a second triaxial Helmholtz coil, wherein a first base is disposed in the first triaxial Helmholtz coil, and the heating calibration turntable is disposed on the first base and connected to the industrial control computer via a heating calibration turntable temperature controller, wherein the sensor signal acquisition system is connected to the heating calibration turntable to acquire a data of the directional sensor under a control of the industrial control computer, and wherein a high-precision inclination and azimuth test turntable is disposed on the second triaxial Helmholtz coil and configured to verify the directional sensor;
• 2) placing a triaxial magnetic sensor on the heating calibration turntable, placing the first triaxial Helmholtz coil on a periphery of the heating calibration turntable, and calibrating a calibration coefficient, a zero deviation and an orthogonality of the first triaxial Helmholtz coil using the triaxial magnetic sensor;
• 3) placing the directional sensor on the heating calibration turntable such that the directional sensor is configured to be heated and calibrated by the heating calibration turntable;
• adjusting the first triaxial Helmholtz coil to generate an additional magnetic field after offsetting a static environmental magnetic field, a magnitude of a magnetic induction intensity of the additional magnetic field being equal to that of a geomagnetic induction intensity, and a direction of the magnetic induction intensity being the same as that of a gravity field;
• adjusting a temperature and triaxial angles of the heating calibration turntable to obtain acquisition data of the directional sensor at different attitudes;
• and calibrating the directional sensor with a data processing method of total field calibration.