Noise pattern acquisition device and position detection apparatus provided therewith
First Claim
1. A noise pattern acquisition device comprising:
- a geomagnetic sensor;
a coordinate estimation unit configured to estimate current position coordinates representing a current position of the noise pattern acquisition device; and
a geomagnetic noise pattern management unit configured to, when an abnormality occurs in a magnetic field strength detected by the geomagnetic sensor during movement of the noise pattern acquisition device, store a geomagnetic noise pattern in a recording medium in association with the current position coordinates estimated by the coordinate estimation unit when the abnormality occurs, the geomagnetic noise pattern being a pattern representing a time-series change of the magnetic field strength detected by the geomagnetic sensor, the time-series change of the magnetic field strength being caused by the movement of the noise pattern acquisition device.
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Abstract
A noise pattern acquisition device includes: a geomagnetic sensor; a coordinate estimation unit configured to estimate current position coordinates; and a geomagnetic noise pattern management unit configured to, when an abnormality occurs in a magnetic field strength detected by the geomagnetic sensor during movement of the noise pattern acquisition device, store in a geomagnetic noise pattern storage unit a geomagnetic noise pattern which is a pattern representing a time-series change of the magnetic field strength detected by the geomagnetic sensor. This makes it possible to not only acquire a geomagnetic noise pattern but also detect a proper position with a simple structure and process at reduced cost.
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Citations
18 Claims
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1. A noise pattern acquisition device comprising:
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a geomagnetic sensor; a coordinate estimation unit configured to estimate current position coordinates representing a current position of the noise pattern acquisition device; and a geomagnetic noise pattern management unit configured to, when an abnormality occurs in a magnetic field strength detected by the geomagnetic sensor during movement of the noise pattern acquisition device, store a geomagnetic noise pattern in a recording medium in association with the current position coordinates estimated by the coordinate estimation unit when the abnormality occurs, the geomagnetic noise pattern being a pattern representing a time-series change of the magnetic field strength detected by the geomagnetic sensor, the time-series change of the magnetic field strength being caused by the movement of the noise pattern acquisition device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A noise pattern acquisition method to be performed by a noise pattern acquisition device, the method comprising:
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estimating current position coordinates representing a current position of the noise pattern acquisition device; and when an abnormality occurs in a magnetic field strength detected by a geomagnetic sensor during movement of the noise pattern acquisition device, storing, in a recording medium, a geomagnetic noise pattern which is a pattern representing a time-series change of the magnetic field strength detected by the geomagnetic sensor, the time-series change of the magnetic field strength being caused by the movement of the noise pattern acquisition device.
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17. A non-transitory computer-readable recording medium for use in a computer, the recording medium having a computer program recorded thereon for causing the computer to acquire a noise pattern, the computer program causing the computer to execute:
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estimating current position coordinates representing a current position of a noise pattern acquisition device; and when an abnormality occurs in a magnetic field strength detected by a geomagnetic sensor during movement of the noise pattern acquisition device, storing, in a recording medium, a geomagnetic noise pattern which is a pattern representing a time-series change of the magnetic field strength detected by the geomagnetic sensor, the time-series change of the magnetic field strength being caused by the movement of the noise pattern acquisition device.
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18. An integrated circuit comprising:
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a coordinate estimation unit configured to estimate current position coordinates representing a current position of a noise pattern acquisition device; and a geomagnetic noise pattern management unit configured to, when an abnormality occurs in a magnetic field strength detected by a geomagnetic sensor during movement of the noise pattern acquisition device, store, in a recording medium, a geomagnetic noise pattern which is a pattern representing a time-series change of the magnetic field strength detected by the geomagnetic sensor, the time-series change of the magnetic field strength being caused by the movement of the noise pattern acquisition device.
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Specification