Patent ID: 11953325
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. A direction calculation apparatus for calculating a direction to be presented as a presented direction to a guided person using a force sensation presentation device gripped by the guided person, the direction calculation apparatus comprising circuitry configured to execute operations comprising:
acquiring, using a geomagnetic map including a bias of an azimuth angle caused by geomagnetic distortion at a position included in a predetermined range, from a current position of the force sensation presentation device, a bias of an azimuth angle caused by geomagnetic distortion at the current position;
acquiring a first azimuth angle, the first azimuth angle indicates an azimuth of the force sensation presentation device, the azimuth without taking into account an influence of geomagnetic distortion in a reference coordinate system at the current position; and
calculating, using the bias and the first azimuth angle, from a first instructed force sensation vector in a reference coordinate system indicating a direction to be instructed to the force sensation presentation device, a second instructed force sensation vector in a force sensation presentation device coordinate system, wherein the second instructed force sensation vector indicates a direction to be instructed to the force sensation presentation device as the presented direction.