Apparatus and method for mitigating interference when phase ranging among beacons and tags
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United States of America Patent
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Nov 24, 2020
Grant Date -
N/A
app pub date -
Jun 25, 2020
filing date -
Jun 25, 2020
priority date (Note) -
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Abstract
A communications system, including at least one tag and a plurality of beacons. The tags are configured to detect beacon advertisement messages, initiate a connection with at least one of the plurality of and transmit a Constant Tone (CT) to the at least one of the plurality of beacons. The tag is further configured to determine a location thereof based on the sampled CT from both the beacon and the tag and then report the location via the one of the beacons and/or an access point. Phase ranging mitigation techniques which include hop duplication, hop interpolation and ADC DC offset correction are employed so as to provide more accurate ranging values even in the case where there are many other devices in local proximity and which are competing for use of the same RF channels as those used by the tags and beacons.
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