TRANSMISSION OF SIGNALS FOR RANGING, TIMING, AND DATA TRANSFER

    公开(公告)号:WO2022087553A2

    公开(公告)日:2022-04-28

    申请号:PCT/US2021/071429

    申请日:2021-09-10

    Abstract: A method is disclosed. In various examples, the method may include receiving an instruction for generating a ranging signal, and transmitting the ranging signal at least partially responsive to the instruction. In various examples the ranging signal may be transmitted via a terrestrial transmitter for transmitting radio waves having encoded messaging information and timing information for one or more of positioning, navigation and timing. In various examples, the ranging signal may exhibit a first ranging pulse and a second ranging pulse of a pulse group and an encoded transmitter identifier, the transmitter identifier encoded by modulating an inter-pulse interval defined between a start of the first ranging pulse and a start of the second ranging pulse.

    APPARATUS AND METHOD FOR MITIGATING INTERFERENCE WHEN PHASE RANGING AMONG BEACONS AND TAGS

    公开(公告)号:WO2021262273A1

    公开(公告)日:2021-12-30

    申请号:PCT/US2021/024806

    申请日:2021-03-30

    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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