Localization device using magnetic field and positioning method thereof
AssigneeIndustrial Technology Research Institute
InventorsKuan-Chun SUN, Sheng-Wen LO
Life of this patent
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Abstract
A localization device using a magnetic field for positioning a moving object is provided. The localization device includes a magnetic landmark, a set of at least four tri-axes magnetic sensors mounted on the moving object, and a logic operation processing unit. The set of at least four tri-axes magnetic sensors forms four non-coplanar points in a three-dimension coordinate system. The logic operation processing unit is connected to the set of at least four tri-axes magnetic sensors. The set of at least four tri-axes magnetic sensors senses the magnetic field of the magnetic landmark and generates at least four magnetic signals transmitted to the logic operation processing unit.
Claims8
A localization device using a magnetic field for positioning a moving object, comprising:
- a magnetic landmark;
- a set of at least four tri-axes magnetic sensors mounted on the moving object, wherein the set of at least four tri-axes magnetic sensors forms four non-coplanar points in a three-dimension coordinate system;
- and
- a logic operation processing unit connected to the set of at least four tri-axes magnetic sensors, wherein the set of at least four tri-axes magnetic sensors senses the magnetic field of the magnetic landmark and generates at least four magnetic signals transmitted to the logic operation processing unit.
The localization device as claimed in 1, wherein the set of at least four tri-axes magnetic sensors is positioned on three axes and an origin of the three-dimension coordinate system and the distance between any two of the four tri-axes magnetic sensors is a known distance.
The localization device as claimed in 2, wherein when the moving object passes through the magnetic landmark, the logic operation processing unit calculates a related-coordinate information and a distance information of the set of at least four tri-axes magnetic sensors relative to the magnetic landmark according to the at least four magnetic signals transmitted from the set of at least four tri-axes magnetic sensors to generate an identification data.
The localization device as claimed in 3, wherein the logic operation processing unit calculates a position vector r of the set of at least four tri-axes magnetic sensors relative to the magnetic landmark according to a magnetic moment B and a gradient tensor matrix G of the set of at least four tri-axes magnetic sensors relative to the magnetic landmark to obtain the identification data, wherein r=−3G−1B.
A positioning method using a magnetic field for positioning a moving object relative to a magnetic landmark, wherein the moving object has a set of at least four tri-axes magnetic sensors mounted thereon, the set of at least four tri-axes magnetic sensors forms four non-coplanar points in a three-dimension coordinate system, and the positioning method comprises:
- sensing the magnetic field of the magnetic landmark and generating at least four magnetic signals by the set of at least four tri-axes magnetic sensors.
The positioning method as claimed in 5, wherein the set of at least four tri-axes magnetic sensors is positioned on three axes and an origin of the three-dimension coordinate system and the distance between any two of the four tri-axes magnetic sensors is a known distance.
The positioning method as claimed in 6, wherein when the moving object passes through the magnetic landmark, the positioning method comprises calculating a related-coordinate information and a distance information of the set of at least four tri-axes magnetic sensors relative to the magnetic landmark according to the at least four magnetic signals transmitted from the set of at least four tri-axes magnetic sensors to generate an identification data.
The positioning method as claimed in 7, wherein a position vector r of the set of at least four tri-axes magnetic sensors relative to the magnetic landmark is calculated according to a magnetic moment B and a gradient tensor matrix G of the set of at least four tri-axes magnetic sensors relative to the magnetic landmark to obtain the identification data, wherein r=−3G−1B.
Dependencies are inferred from the claim text.