Sampson-distance based ellipse fitting for calibration of magnetic compass deviations

LUO Shouhong; ZHANG Rong; GUO Meifeng; PENG Zhuo

doi:10.16511/j.cnki.qhdxxb.2016.21.035

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Journal of Tsinghua University(Science and Technology) ›› 2016, Vol. 56 ›› Issue (3) : 324-327,333. DOI: 10.16511/j.cnki.qhdxxb.2016.21.035

PRECISION INSTRUMENTS AND MECHANOLOGY

Sampson-distance based ellipse fitting for calibration of magnetic compass deviations

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Abstract

Magnetic compasses are widely used in civil and military navigation applications but they are susceptible to magnetic disturbances in the environment. Thus, the compasses must be calibrated for the magnetic effects in the environment after installation. The calibration also improves the compass accuracy. An analysis of the effects of magnetic disturbances showed that the ellipse output assumption in the Sampson-distance based ellipse fitting method could be used to fit raw magnetic compass measurements. Then, the fitting coefficients are used to calibrate the compass readings to compensate for the environmental disturbances to improve the heading accuracy. A multi-position turntable experiment was used to calibrate a C100 two-dimensional magnetic compass fabricated by KVH. After calibration, the mean heading error was reduced from 1.5° to 0.25°, which illustrates the validity and practicality of this method.

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magnetic compass / compass deviation / Sampson-distance / ellipse fitting

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LUO Shouhong, ZHANG Rong, GUO Meifeng, PENG Zhuo. Sampson-distance based ellipse fitting for calibration of magnetic compass deviations[J]. Journal of Tsinghua University(Science and Technology). 2016, 56(3): 324-327,333 https://doi.org/10.16511/j.cnki.qhdxxb.2016.21.035

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