| 摘要 |
PROBLEM TO BE SOLVED: To provide a gradient measurement method and an apparatus therefor capable of measuring a gradient (inclination angle or inclination orientation) of an installation surface of an accelerator sensor with high accuracy while removing a drift (dynamic error) or the like that differs depending on a rotation stop position.SOLUTION: A detection axis of an accelerator sensor 10x (10y) having the detection axis on a virtual plane intersecting a gravity direction is set to each of a first measurement orientation (0 degree) as a reference orientation, at least two second measurement orientations (90, 180 degrees or the like) different from the first measurement orientation, and a third measurement orientation where the detection axis is returned to the reference orientation; and measurement is performed by setting the detection axis to four or more measurement orientations including three or more different measurement orientations. A dynamic error that each differs depending on the measurement orientation is measured based on the difference in the output of the accelerator sensor set to the first and third measurement orientations. At least either of an inclination angle and an inclination azimuth angle is measured based on a data that is prepared by removing the dynamic error and a static error from the output of the accelerator sensor and depends on the inclination angle and the inclination azimuth angle of the virtual plane inclined with respect to the horizontal plane.SELECTED DRAWING: Figure 6 |
