A plurality of location beacons is deployed within a site that is divided into zones. A plurality of assets is distributed within the site, each asset having an asset beacon attached to it. A tag occasionally moving within the site continually locates its current zone by detecting short-range signals received from location beacons, and when detecting an asset beacon, the tag locates the respective asset within the current zone of the tag.

A plurality of location beacons is deployed within a site that is divided into zones. A plurality of assets is distributed within the site, each asset having an asset beacon attached to it. A tag occasionally moving within the site continually locates its current zone by detecting short-range signals received from location beacons, and when detecting an asset beacon, the tag locates the respective asset within the current zone of the tag.

A system and method for keeping restricted objects within a confined area that forms part of an institutional site. The confined area having lockable exits, a safe area where the restricted objects are designated to stay, a buffer area adjacent to the first area, and a lock area situated between the buffer area and the lockable exits. The system detects whether the restricted object is in the buffer area or in the lock area and checks whether the restricted object is authorized to leave the safe area. Upon recognizing that the restricted object is in the buffer area and is not authorized to leave the safe area, the system sends a message to a tag of a staff member, instructing to move the restricted object back to the safe area; upon recognizing that the restricted object is in the lock area and is not authorized to leave the safe area, the system sends a locking signal to lockable exits.

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.

A system and methods for estimating the location of a mobile device are disclosed. In accordance with one embodiment, a mobile device receives, at a first time t.sub.1, a wireless electromagnetic signal, where the wireless electromagnetic signal comprises a first identifier that identifies a first beacon that transmitted the wireless electromagnetic signal. The mobile device receives, at a second time t.sub.2, t.sub.2>t.sub.1, an ultrasound signal lacking an identification of the source of the ultrasound signal. A time difference of arrival (TODA) t.sub.2t.sub.1 is compared to a maximum TDOA. A location of the mobile device is estimated based on the TDOA only when the TDOA is less than or equal to the maximum TDOA.

The present disclosure concerns a low-power location awareness system for electronic devices (e.g., mobile devices) operating inside significant locations (e.g., a casino environment), wherein the electronic device includes an improved proximity-sensing feature (e.g., via a mobile app executing on a player's device) that provides the option to track the player within the (in this example) casino environment. To address security (and power-consumption) concerns, the proximity-sensing feature may utilize a two-level fencing verification process, i.e., geofencing and beacon fencing, before availing itself to the beacon sightings. In other words, the proximity-sensing features (e.g., displaying a coupon deal or customized greetings) will be made available to the mobile app and/or electronic device only after both fencing verification requirements are met. These techniques help to optimize the use of battery power while the electronic device is implementing the proximity-sensing features by operating in two location-awareness modes: beacon monitoring mode and beacon ranging mode.

The present disclosure concerns a low-power location awareness system for electronic devices (e.g., mobile devices) operating inside significant locations (e.g., a casino environment), wherein the electronic device includes an improved proximity-sensing feature (e.g., via a mobile app executing on a player's device) that provides the option to track the player within the (in this example) casino environment. To address security (and power-consumption) concerns, the proximity-sensing feature may utilize a two-level fencing verification process, i.e., geofencing and beacon fencing, before availing itself to the beacon sightings. In other words, the proximity-sensing features (e.g., displaying a coupon deal or customized greetings) will be made available to the mobile app and/or electronic device only after both fencing verification requirements are met. These techniques help to optimize the use of battery power while the electronic device is implementing the proximity-sensing features by operating in two location-awareness modes: beacon monitoring mode and beacon ranging mode.

A ranging beacon system to measure the performance of a running athlete can include a ranging base and a wearable device. The ranging base can be placed along an exercise path with line of sight to an athlete and can include a ranging base ultra-wideband (UWB) transceiver. The ranging base UWB transceiver can receive a first UWB signal and transmit a second UWB signal. The wearable device can be worn by the athlete and the wearable device can include a wearable device UWB transceiver, and a processor. The wearable device UWB transceiver can transmit the first UWB signal and receive the second UWB signal. The processor can generate ranging data of the athlete based on the first and the second UWB signals.

A ranging beacon system to measure the performance of a running athlete can include a ranging base and a wearable device. The ranging base can be placed along an exercise path with line of sight to an athlete and can include a ranging base ultra-wideband (UWB) transceiver. The ranging base UWB transceiver can receive a first UWB signal and transmit a second UWB signal. The wearable device can be worn by the athlete and the wearable device can include a wearable device UWB transceiver, and a processor. The wearable device UWB transceiver can transmit the first UWB signal and receive the second UWB signal. The processor can generate ranging data of the athlete based on the first and the second UWB signals.