Detection of metal disturbance
First Claim
1. A method for tracking an object using an energy field, in the presence of interference due to introduction of an article responsive to the field, in the vicinity of the object, comprising:
- producing a first energy field in the vicinity of the object;
identifying and determining a characteristic of a parasitic energy field induced responsive to the first field, due to introduction of the article;
receiving signals responsive to the first energy field and the parasitic energy field generated at a plurality of locations of the object after introduction of the article; and
determining spatial coordinates of the object responsive to the generated signals and the determined characteristic by determining a phase shift of the signals responsive to the parasitic energy field with respect to the signals responsive to the first energy field.
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Accused Products
Abstract
A method for tracking an object using energy fields, in the presence of interference due to introduction of an article responsive to the fields, in the vicinity of the object. One or more desired energy fields are produced in the vicinity of the object, and a characteristic of energy fields induced due to introduction of the article is determined. Signals are generated responsive to the energy fields at a plurality of locations of the object after introduction of the article. Spatial coordinates of the object are determined, responsive to the generated signals and the determined characteristic.
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Citations
19 Claims
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1. A method for tracking an object using an energy field, in the presence of interference due to introduction of an article responsive to the field, in the vicinity of the object, comprising:
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producing a first energy field in the vicinity of the object; identifying and determining a characteristic of a parasitic energy field induced responsive to the first field, due to introduction of the article; receiving signals responsive to the first energy field and the parasitic energy field generated at a plurality of locations of the object after introduction of the article; and determining spatial coordinates of the object responsive to the generated signals and the determined characteristic by determining a phase shift of the signals responsive to the parasitic energy field with respect to the signals responsive to the first energy field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An object tracking system, comprising:
- a radiator, which generates an energy field in the vicinity of the object;
a sensor, fixed to the object, which generates signals responsive to the energy field; and signal processing circuitry, which receives the signals from the sensor and determines position coordinates of the object responsive thereto, while detecting interference in the signals due to introduction into the vicinity of the object of an article responsive to the energy field wherein the circuitry detects a phase shift in the signals due to the introduction of the article. - View Dependent Claims (15, 16, 17, 18, 19)
- a radiator, which generates an energy field in the vicinity of the object;
Specification