AZIMUTH MEASUREMENT DEVICE

摘要

There is provided an azimuth measurement device capable of not obtaining erroneous offset information when a change is made while maintaining a posture in a particular direction and capable of obtaining corresponding offset information when a change is made in an arbitrary direction. Data from a 3-axis sensor detecting earth magnetism is processed by a data processing unit (19). The processing unit (19) repeatedly, by a predetermined number of times or more, acquires 3-axis output data when the earth magnetism direction has changed in a 3-dimensional space. On the 3-dimensional coordinates having the 3-axis output data as the respective axis components, a coordinate of a position where the irregularities of the distance from the 3-axis output data group is minimum is statistically estimated so as to be used a reference point. According to the coordinate of the reference point, the 3-axis output data offset information is calculated to judge whether the 3-axis output data group is distributed in the vicinity of a particular plane. When the 3-axis output data group is judged to be distributed in the vicinity of a particular plane, the estimation of the coordinate of the reference point is not performed or the estimated coordinate of the reference point is discarded.