Tilt Error Analysis and Compensation for Two-Position North Determining Scheme in FOG North-Seeker

摘要

Two-position north determining scheme for FOG north seeker can effectively eliminate the impact of drift, and can be easily implemented. But the angle between the base and the horizontal plane will induce tilt error and reduce the north seeking accuracy. In order to eliminate the tilt error and to improve the north seeking accuracy, the corresponding tilt compensation scheme is designed in this paper. A tilt sensor is used to measure the angle between the base and the horizontal plane, and the DSP is used to collect the output of the tilt sensor and solve real-time compensation. North seeking experiments proved that this tilt compensation scheme can compensate the base plane tilt error, and improve the north seeking accuracy effectively.