Method and device for determing the position or orientation of an object
First Claim
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1. Method for determining the position or the orientation of an object in space, in which:
- in all of the space where the object is supposed to be situated, a magnetic field (Hi) is produced using a plurality of N sources (Si) (where N is a whole number at least equal to
1), the object is equipped with a magnetic sensor (20), the signal (ci (t)) delivered by the sensor (20) is processed in order to determine the respective contributions of each of the N sources (Si) and the position or the orientation of the object is deduced from this, characterised in that;
the field (Hi) produced by each source (Si) is coded using a code that is specific to this source, wherein the N different codes assigned to the N different sources are two by two orthogonal. the N respective contributions of the N sources are obtained through decodings that correspond to the N codes used in the sources.
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Abstract
Method for determining the position or the orientation of an object using a magnetic field and corresponding device.
The fields produced by sources (S1, S2, S3) are coded, for example, by pseudo-random binary sequences. In this way it is possible, in a sensor (20) fixed to the object, to distinguish the respective contributions of different sources. The position or the orientation of the object on which the sensor (20) is fixed can be deduced (40) from these contributions.
Applications in remote control, positioning, security, medicine, etc.
13 Citations
9 Claims
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1. Method for determining the position or the orientation of an object in space, in which:
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in all of the space where the object is supposed to be situated, a magnetic field (Hi) is produced using a plurality of N sources (Si) (where N is a whole number at least equal to
1),the object is equipped with a magnetic sensor (20), the signal (ci (t)) delivered by the sensor (20) is processed in order to determine the respective contributions of each of the N sources (Si) and the position or the orientation of the object is deduced from this, characterised in that;
the field (Hi) produced by each source (Si) is coded using a code that is specific to this source, wherein the N different codes assigned to the N different sources are two by two orthogonal. the N respective contributions of the N sources are obtained through decodings that correspond to the N codes used in the sources. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification