Abstract
In order to calibrate the misalignment error of a triaxial magnetometer and an inertial navigation system in a three-component magnetic survey system, an improved method with easy realization is proposed in this paper. We establish the misalignment error model based on Euler’s theorem. We transform the calibration of misalignment error into estimating calibration parameters to minimize the value of objective function. Then, the nonlinear least squares method is used to estimate the calibration parameters. In the simulation experiment, the deviation between the value and the preset value is within 1 nT. In the field experiment, the fluctuation value of the x, y, and z components reduce to 1.09%, 0.92%, and 1.28%, respectively. The absolute deviation values are reduced to 0.72%, 0.70%, and 0.81% and the standard deviation value are reduced to 0.74%, 0.71%, 0.86%, respectively. The proposed method has advantages of high operability and precision as compared with existing methods.
Highlights
A three-component magnetic survey system is composed of a triaxial magnetometer and an inertial navigation system (INS) and is widely used in resource exploration [1], magnetic anomaly detection [2], and geomagnetic aid for navigation [3,4]
After restoring the data to the geographic coordinate coordinate system, the deviation between the calibrated value and the preset value of the simulation system, the deviation between the calibrated value and the preset value of the simulation experiment experiment is shown in Table 2, which verifies the feasibility of this improved method
The experimental data are obtained by rotating the three-component magnetic survey system an arbitrary axis
Summary
A three-component magnetic survey system is composed of a triaxial magnetometer and an inertial navigation system (INS) and is widely used in resource exploration [1], magnetic anomaly detection [2], and geomagnetic aid for navigation [3,4]. An INS is used to provide attitude information to restore three-component magnetic data to a geographic coordinate system. The accuracy of the restoration process is affected by the accuracy of the INS and the misalignment error of the system. There have been many research achievements made in error correction of a magnetometer [5,6,7]. In 1997, Primdahl proposed a method to align the magnetometer and star sensor [11]. Research on misalignment error is still relatively weak.
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