Method and apparatus for selecting reference tag used for positioning
First Claim
1. A method for selecting a reference tag used for positioning, the method comprising:
- obtaining a first signal strength of a signal emitted by a reference tag of a plurality of reference tags and a second signal strength of a signal emitted by a tag to be positioned, wherein the first signal strength and the second signal strength are detected by each radio frequency reader of a plurality of radio frequency readers;
comparing the first signal strength with the second signal strength detected by each of the plurality of radio frequency readers to produce a corresponding signal strength difference and to determine a boundary of each radio frequency reader, and dividing a network into a first area and a second area with the boundary, wherein the reference tag is disposed within the first area and the first area includes a first plurality of radio frequency readers having a positive signal strength difference value, and the tag to be positioned is disposed within the second area and the second area includes a second plurality of radio frequency readers having a negative signal strength difference value;
determining an estimated direction of the tag to be positioned relative to the reference tag according to a relative position of the reference tag and the boundary; and
according to the estimated direction and a number of reference tags used to form a reference tag group, selecting a valid reference tag group from the plurality of reference tags and using the selected valid reference tag group for positioning the tag to be positioned.
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Accused Products
Abstract
A method and an apparatus for selecting a reference tag used for positioning are provided. The method includes: obtaining first signal strength emitted by a reference tag and second signal strength emitted by a tag to be positioned, where the first signal strength and the second signal strength are detected by each radio frequency reader; comparing the first signal strength with the second signal strength to determine a boundary of the radio frequency readers, and dividing a network into a first area and a second area with the boundary; determining an estimated direction of the tag to be positioned relative to the reference tag according to a relative position of the reference tag and the boundary; and according to the estimated direction and according to the specified number of reference tags, selecting a valid reference tag group as the reference tag used for positioning.
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Citations
13 Claims
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1. A method for selecting a reference tag used for positioning, the method comprising:
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obtaining a first signal strength of a signal emitted by a reference tag of a plurality of reference tags and a second signal strength of a signal emitted by a tag to be positioned, wherein the first signal strength and the second signal strength are detected by each radio frequency reader of a plurality of radio frequency readers; comparing the first signal strength with the second signal strength detected by each of the plurality of radio frequency readers to produce a corresponding signal strength difference and to determine a boundary of each radio frequency reader, and dividing a network into a first area and a second area with the boundary, wherein the reference tag is disposed within the first area and the first area includes a first plurality of radio frequency readers having a positive signal strength difference value, and the tag to be positioned is disposed within the second area and the second area includes a second plurality of radio frequency readers having a negative signal strength difference value; determining an estimated direction of the tag to be positioned relative to the reference tag according to a relative position of the reference tag and the boundary; and according to the estimated direction and a number of reference tags used to form a reference tag group, selecting a valid reference tag group from the plurality of reference tags and using the selected valid reference tag group for positioning the tag to be positioned. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for selecting a reference tag used for positioning, the apparatus comprising:
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a processor; and memory coupled to the processor including instructions that, when executed by the processor, cause the apparatus to; obtain a first signal strength of a signal emitted by a reference tag of a plurality of reference tags and a second signal strength of a signal emitted by a tag to be positioned, wherein the first signal strength and the second signal strength are detected by each radio frequency reader of a plurality of radio frequency readers; compare the first signal strength with the second signal strength detected by each of the plurality of radio frequency readers to produce a corresponding signal strength difference and to determine a boundary of each radio frequency reader, and divide a network into a first area and a second area with the boundary, wherein the reference tag is disposed within the first area and the first area includes a first plurality of radio frequency readers having a positive signal strength difference value, and the tag to be positioned is disposed within the second area and the second area includes a second plurality of radio frequency readers having a negative signal strength difference value; according to a relative position of the reference tag and the boundary, determine an estimated direction of the tag to be positioned relative to the reference tag; and according to the estimated direction and a number of reference tags used to form a reference tag group, select a valid reference tag group from the plurality of reference tags and use the selected valid reference tag group for positioning the tag to be positioned. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification