| 摘要 |
PROBLEM TO BE SOLVED: To display a traveling azimuth having a small error by utilizing turning of a vehicle, even if an electronic compass displays a wrong azimuth by polarization. SOLUTION: This compass has two magnetic detection parts 11, 11' arranged orthogonally, an azimuth operation means 32 for calculating the traveling azimuth of a moving body, a magnetic field determination means for determining normality/abnormality of a magnetic field, and a calibration means 33 for calibrating the center of an azimuth circle drawn by biaxial component data by turning of the moving body when determined to be abnormal by the magnetic field determination means 31. The calibration means 33 is equipped with a center operation means 331 for calculating the center of the azimuth circle from at least three biaxial component data, and a least-squares-method operation means 332 for calculating the azimuth circle by using the least-squares method from the prescribed number of biaxial component data. When the magnetic field determination means 31 determines to be normal, the azimuth operation means 32 outputs the traveling azimuth calculated from the biaxial component data, and when the magnetic field determination means 31 determines to be abnormal, the azimuth operation means 32 calculates and outputs the traveling azimuthθby using the center of the azimuth circle calibrated by the calibration means 33. COPYRIGHT: (C)2006,JPO&NCIPI
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