Back to results
US 10,209,069 B2Granted
Offset calculation circuit and azimuth sensor using the same
AssigneeRohm Co., Ltd.
InventorKoji Saito
Life of this patent
Estimating the term…
Abstract
An offset calculation circuit comprising a data obtaining unit for sequentially obtaining two-axis or three-axis magnetic detection data as a set of data points of a two-axis coordinate system or a three-axis coordinate system; an offset recording unit for recording offset components of the magnetic detection data as an offset point of the two-axis coordinate system or the three-axis coordinate system; and an offset calculation unit for calculating a first reference line or a first reference plane put between first and second data points among the set of data points, and subsequently moving the offset point recorded in the offset recording unit in a direction toward the first reference line or the first reference plane to calculate a first offset candidate point.
Claims20
An offset calculation circuit, comprising:
- a data obtaining unit connected to two or more magnetic sensors to sequentially obtain, from the two or more magnetic sensors, two-axis magnetic detection data as a set of data points for a two-axis coordinate system or three-axis magnetic detection data as a set of data points for a three-axis coordinate system, the two-axis or three-axis magnetic detection data being generated based on magnetism detected in two or more directions by the two or more magnetic sensors;
- an offset recording unit for recording offset components of the two-axis or three-axis magnetic detection data as an offset point of the two-axis coordinate system or the three-axis coordinate system;
- and
- an offset calculation unit for calculating a first reference line put between first and second data points among the set of data points for the two-axis coordinate system or a first reference plane put between first and second data points among the set of data points for the three-axis coordinate system, and subsequently moving the offset point recorded in the offset recording unit in a direction toward the first reference line or the first reference plane to calculate a first offset candidate point.
1 more element
An azimuth sensor, comprising:
- a magnetic detection circuit including two or more magnetic sensors to generate two-axis magnetic detection data as a set of data points for a two-axis coordinate system or three-axis magnetic detection data as a set of data points for a three-axis coordinate system, based on magnetism detected in two or more directions;
- an offset calculation circuit for calculating an offset of the magnetic detection data, the offset calculation circuit including:
- a data obtaining unit for sequentially obtaining, from the two or more magnetic sensors, the two-axis magnetic detection data or the three-axis magnetic detection data;
- an offset recording unit for recording offset components of the two-axis or three-axis magnetic detection data as an offset point of the two-axis coordinate system or the three-axis coordinate system;
- and
- an offset calculation unit for calculating a first reference line put between first and second data points among the set of data points for the two-axis coordinate system or a first reference plane put between first and second data points among the set of data points for the three-axis coordinate system, and subsequently moving the offset point recorded in the offset recording unit in a direction toward the first reference line or the first reference plane to calculate a first offset candidate point;
- an offset correction circuit for correcting the offset of the magnetic detection data;
- and
- an azimuth operation circuit for generating azimuth data from the corrected magnetic detection data.
6 more elements
An electronic device comprising an azimuth sensor, the azimuth sensor comprising:
- a magnetic detection circuit including two or more magnetic sensors to generate two-axis magnetic detection data as a set of data points for a two-axis coordinate system or three-axis magnetic detection data as a set of data points for a three-axis coordinate system, based on magnetism detected in two or more directions;
- an offset calculation circuit for calculating an offset of the magnetic detection data, the offset calculation circuit including:
- a data obtaining unit for sequentially obtaining, from the two or more magnetic sensors, the two-axis magnetic detection data or the three-axis magnetic detection data;
- an offset recording unit for recording offset components of the two-axis or three-axis magnetic detection data as an offset point of the two-axis coordinate system or the three-axis coordinate system;
- and
- an offset calculation unit for calculating a first reference line put between first and second data points among the set of data points for the two-axis coordinate system or a first reference plane put between first and second data among the set of data points for the three-axis coordinate system, and subsequently moving the offset point recorded in the offset recording unit in a direction toward the first reference line or the first reference plane to calculate a first offset candidate point;
- an offset correction circuit for correcting the offset of the magnetic detection data;
- and
- an azimuth operation circuit for generating azimuth data from the corrected magnetic detection data.
6 more elements
An offset calculation circuit, comprising:
- a data obtaining unit connected to at least three magnetic sensors to sequentially obtain, from the at least three magnetic sensors, three-axis magnetic detection data as a set of data points for a three-axis coordinate system, the three-axis magnetic detection data being generated based on magnetism detected in three directions by the at least three magnetic sensors;
- an offset recording unit for recording offset components of the three-axis magnetic detection data as an offset point of the three-axis coordinate system;
- and
- an offset calculation unit for calculating a first reference line passing through a first region surrounded by first, second, and third data points among the set of data points, and subsequently moving the offset point recorded in the offset recording unit in a direction toward the first reference line to calculate a first offset candidate point.
1 more element
An azimuth sensor, comprising:
- a magnetic detection circuit including at least three magnetic sensors to generate three-axis magnetic detection data as a set of data points for a three-axis coordinate system, based on magnetism detected in three directions;
- an offset calculation circuit for calculating an offset of the magnetic detection data, the offset calculation circuit including;
- a data obtaining unit for sequentially obtaining, from the at least three magnetic sensors, the three-axis magnetic detection data;
- an offset recording unit for recording offset components of the three-axis magnetic detection data as an offset point of the three-axis coordinate system;
- and
- an offset calculation unit for calculating a first reference line passing through a first region surrounded by first, second, and third data points among the set of data points, and subsequently moving the offset point recorded in the offset recording unit in a direction toward the first reference line to calculate a first offset candidate point;
- an offset correction circuit for correcting the offset of the magnetic detection data;
- and
- an azimuth operation circuit for generating azimuth data from the corrected magnetic detection data.
6 more elements
An electronic device comprising an azimuth sensor, the azimuth sensor comprising:
- a magnetic detection circuit including at least three magnetic sensors to generate three-axis magnetic detection data as a set of data points for a three-axis coordinate system, based on magnetism detected in three directions;
- an offset calculation circuit for calculating an offset of the magnetic detection data, the offset calculation circuit including;
- a data obtaining unit for sequentially obtaining, from the at least three magnetic sensors, the three-axis magnetic detection data;
- an offset recording unit for recording offset components of the three-axis magnetic detection data as an offset point of the three-axis coordinate system;
- and
- an offset calculation unit for calculating a first reference line passing through a first region surrounded by first, second, and third data points among the set of data points, and subsequently moving the offset point recorded in the offset recording unit in a direction toward the first reference line to calculate a first offset candidate point;
- an offset correction circuit for correcting the offset of the magnetic detection data;
- and
- an azimuth operation circuit for generating azimuth data from the corrected magnetic detection data.
6 more elements
Dependencies are inferred from the claim text.