ELECTRONIC SHELF LABEL (ESL) EFFICIENT RECONNECT

    公开(公告)号:US20210282035A1

    公开(公告)日:2021-09-09

    申请号:US17110565

    申请日:2020-12-03

    Abstract: According to various aspects and techniques to enable methods and systems for a first communication device to determine an approximate number of other communication devices that have lost contact with a host communication device. This includes determining a common future time window using a last known global time stamp and determining a transmit time within the common future time window. This also includes receiving samples that are captured during the common future time window on a predefined communication channel, as well as analyzing the received samples to estimate the total number of other communication devices.

    TAMPERING DETECTION IN PHASE BASED RANGING

    公开(公告)号:US20210160001A1

    公开(公告)日:2021-05-27

    申请号:US16696804

    申请日:2019-11-26

    Abstract: Methods, systems, and devices for tampering detection in phase based ranging are described.
    A device may engage in two-tone phase based ranging. For example, the device may transmit a composite signal that includes a first carrier at a first frequency and a second carrier at a second frequency. The device may receive a third carrier at the first frequency and measure its phase. The device may determine a phase sum associated with the first frequency based on the measured phase of the third carrier and a measured phase of the first carrier. The device may compare the phase sum with a reference value and determine whether tampering with the phase based ranging has occurred based on the comparison.

    ROUND TRIP PHASE EXTENDED RANGE
    3.
    发明申请

    公开(公告)号:US20210124061A1

    公开(公告)日:2021-04-29

    申请号:US16667515

    申请日:2019-10-29

    Abstract: Secure range estimates as described herein may include determining a range estimate between two Bluetooth enabled devices based, at least in part, on round trip phase measurements of wireless signals transmitted between the devices. In one example, a range estimate may include determining a first set of relative carrier measurements at a first set of frequencies, determining a second set of relative carrier measurements based on the first set at the second set of frequencies; and combining the first set and the second set to estimate a distance between the devices.

    Method for Measuring Distance To A Short In A Two-Conductor Wire

    公开(公告)号:US20230118013A1

    公开(公告)日:2023-04-20

    申请号:US17451150

    申请日:2021-10-15

    Abstract: Various embodiments may provide systems and methods for determining a distance to a short in a two-conductor wire. Various embodiments may include determining a distance to a short in a two-conductor wire based at least in part on a phase difference between a phase of an injected tone and a phase of a reflected tone. Various embodiments may include determining a distance to a short in a two-conductor wire based at least in part on both a phase difference and an amplitude difference between an injected tone and a reflected tone. Various embodiments may include determining a distance to a short in a two-conductor wire based at least in part on a measured peak voltage of a combined pulse.

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