Received signal strength location determination of low frequency tags
First Claim
1. A method of establishing a location for a tag using a plurality of signposts, the method comprising:
- receiving at the tag a near-field magnetic signal from a first signpost;
receiving at the tag a near-field magnetic signal from a second signpost;
measuring at the tag a signal strength for the received signal from the first signpost with respect to an antenna on the tag;
measuring at the tag a signal strength for the received signal from the second signpost with respect to the antenna;
calculating a received signal strength indication using the measured signal strength of the received signals from the first signpost;
calculating a received signal strength indication using the measured signal strength of the received signals from the second signpost; and
determining a location for the tag using the calculated received signal strength indications from the first and second signposts.
1 Assignment
0 Petitions
Accused Products
Abstract
Systems and methods provide for determining a distance between a signpost and a tag and for locating a tag using multiple signposts. The system uses a signal received at a tag from a signpost, and from them measures the signal strength of the signal with respect to one or more antennas on the tag. The system calculates an RSSI using the measured signal strength, from which a distance can be determined between the signpost and the tag. The system also uses signals received from multiple signposts, to measure multiple signal strengths, resulting in multiple distance determinations corresponding to the various signposts, thereby establishing a location for the tag.
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Citations
46 Claims
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1. A method of establishing a location for a tag using a plurality of signposts, the method comprising:
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receiving at the tag a near-field magnetic signal from a first signpost; receiving at the tag a near-field magnetic signal from a second signpost; measuring at the tag a signal strength for the received signal from the first signpost with respect to an antenna on the tag; measuring at the tag a signal strength for the received signal from the second signpost with respect to the antenna; calculating a received signal strength indication using the measured signal strength of the received signals from the first signpost; calculating a received signal strength indication using the measured signal strength of the received signals from the second signpost; and determining a location for the tag using the calculated received signal strength indications from the first and second signposts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A tag, comprising:
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a receive module for receiving at the tag a near-field magnetic signal from a first signpost and a near-field magnetic signal from a second signpost; a measure module for measuring at the tag a signal strength for the received signal from the first signpost and a signal strength for the received signal from the second signpost with respect to an antenna on the tag, the measure module enabled to receive signals from the receive module; a calculate module for calculating a received signal strength indication using the measured signal strength of the received signals from the first signpost and calculating a received signal strength indication using the measured signal strength of the received signals from the second signpost, the calculate module enabled to receive signals from the measure module; and a location module for determining a location for the tag using the calculated received signal strength indications from the first and second signposts, the location module enabled to received signals from the calculate module. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A computer program product comprising a computer-readable storage medium having computer program instructions embodied thereon for establishing a location for a tag using a plurality of signposts, the computer program product comprising:
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a receive module for receiving at the tag a near-field magnetic signal from a first signpost and a near-field magnetic signal from a second signpost; a measure module for measuring at the tag a signal strength for the received signal from the first signpost and a signal strength for the received signal from the second signpost with respect to an antenna on the tag; a calculate module for calculating a received signal strength indication using the measured signal strength of the received signals from the first signpost and calculating a received signal strength indication using the measured signal strength of the received signals from the second signpost; and a location module for determining a location for the tag using the calculated received signal strength indications from the first and second signposts. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification