In one example, a device includes a receiver configured to receive a low-power X band radar transmission, and a transmitter operably coupled to the receiver and configured to transmit an X band transmission in response to receiving the low-power X band radar transmission.

Head-mounted augmented reality (AR) devices can track pose of a wearer's head to provide a three-dimensional virtual representation of objects in the wearer's environment. An electromagnetic (EM) tracking system can track head or body pose. A handheld user input device can include an EM emitter that generates an EM field, and the head-mounted AR device can include an EM sensor that senses the EM field. EM information from the sensor can be analyzed to determine location and/or orientation of the sensor and thereby the wearer's pose. The EM emitter and sensor may utilize time division multiplexing (TDM) or dynamic frequency tuning to operate at multiple frequencies. Voltage gain control may be implemented in the transmitter, rather than the sensor, allowing smaller and lighter weight sensor designs. The EM sensor can implement noise cancellation to reduce the level of EM interference generated by nearby audio speakers.

Head-mounted augmented reality (AR) devices can track pose of a wearer's head to provide a three-dimensional virtual representation of objects in the wearer's environment. An electromagnetic (EM) tracking system can track head or body pose. A handheld user input device can include an EM emitter that generates an EM field, and the head-mounted AR device can include an EM sensor that senses the EM field. EM information from the sensor can be analyzed to determine location and/or orientation of the sensor and thereby the wearer's pose. The EM emitter and sensor may utilize time division multiplexing (TDM) or dynamic frequency tuning to operate at multiple frequencies. Voltage gain control may be implemented in the transmitter, rather than the sensor, allowing smaller and lighter weight sensor designs. The EM sensor can implement noise cancellation to reduce the level of EM interference generated by nearby audio speakers.

Administration and consistency of proximity beacon naming within one or more venues is improved by use of a mobile device to discover ranges of the beacons, and upon discovery, determining a location of a mobile computing device within the venue; receiving at the location by the mobile computing device one or more identifiers from one or more proximity beacons within range of the location; and updating by the mobile device at least one of the one or more identifiers according to a proximity beacon naming policy.

Provided is a portable electronic device including a transceiver configured to acquire information from a roadside device, a storage, and a controller configured to acquire position information of the roadside device based on the information acquired by transceiver, and to cause the storage to store the acquired position information as position information of the portable electronic device at a time of acquiring the information.

Provided is a portable electronic device including a transceiver configured to acquire information from a roadside device, a storage, and a controller configured to acquire position information of the roadside device based on the information acquired by transceiver, and to cause the storage to store the acquired position information as position information of the portable electronic device at a time of acquiring the information.

Systems, apparatuses and methods are provided herein for tracking carts in a shopping space. A system for tracking carts in a shopping space comprises: a sound sensor array, a cart location database storing location information and sound profiles associated with a plurality of shopping cart identifiers, and a control circuit configured to: identify a cart sound made by a movement of a shopping cart traveling in the shopping space, determine a current location of the shopping cart based on the cart sound, match the shopping cart to a shopping cart identifier in the cart location database, update the location information associated the shopping cart identifier in the cart location database based on the current location of the shopping cart; and update the sound profile of the shopping cart identifier based on the cart sound captured by the sound sensor array.

Systems, apparatuses and methods are provided herein for tracking carts in a shopping space. A system for tracking carts in a shopping space comprises: a sound sensor array, a cart location database storing location information and sound profiles associated with a plurality of shopping cart identifiers, and a control circuit configured to: identify a cart sound made by a movement of a shopping cart traveling in the shopping space, determine a current location of the shopping cart based on the cart sound, match the shopping cart to a shopping cart identifier in the cart location database, update the location information associated the shopping cart identifier in the cart location database based on the current location of the shopping cart; and update the sound profile of the shopping cart identifier based on the cart sound captured by the sound sensor array.

A tracking system determines a location of a tracking device associated with a user using one or more access points at the location. Each access point at the location is configured to detect and couple with the tracking device when the tracking device is within a communicative range of the access point. An access point provides updates on the tracking device's presence, as well as the tracking device's arrival to and departure from the communicative range of the access point, to a tracking server. The tracking server determines, from these updates, whether the tracking device is at the location. The user may be notified, via a mobile device, of the tracking device's location.

A tracking system determines a location of a tracking device associated with a user using one or more access points at the location. Each access point at the location is configured to detect and couple with the tracking device when the tracking device is within a communicative range of the access point. An access point provides updates on the tracking device's presence, as well as the tracking device's arrival to and departure from the communicative range of the access point, to a tracking server. The tracking server determines, from these updates, whether the tracking device is at the location. The user may be notified, via a mobile device, of the tracking device's location.