Error Compensation and Implementation of Embedded High-Precision Magnetometer

An embedded tri-axial magnetometer of high precision based on AMR (Anisotropy Magnetic Resistance) sensor was designed and achieved in this paper. For purpose of avoiding ferromagnetic disturbances to magnetic sensor, this device applied the manner of separating the sensor and signal processing terminal. By theoretically analyzing main errors of the magnetometer, compensation model was established, and characteristic parameters of the model were calculated using Newton iteration method. Experimental test was carried out in different locations. The results showed that, measurement error was reduced effectively after compensation, which could significantly improve real-time measurement accuracy of embedded magnetometer.