A system for determining a bearing or location of a radio frequency identification (RFID) tag using a handheld RFID reader is described. In one embodiment, the reader is equipped with an accelerometer. A user moves the reader while the reader receives the tag's signal and determines the tag signal's phase at multiple locations. The locations of the reader antenna can be reconstructed using the accelerometer data. By using the phase determined at multiple locations in conjunction with the location of the reader antenna, the reader can determine the bearing of the tag. For an RFID reader not equipped with an accelerometer, the sign and ratio of the rate of change in the phase of a tag's signal to the distance traveled by the reader antenna can be used to determine the location of the tag relative to the reader.

A method for locating a user device in a sub-zone of a main zone defined with respect to a vehicle, especially including detecting the user device in a first sub-zone, locating the user device in the first sub-zone, keeping locating the user device in the first sub-zone for as long as the user device is detected in the first sub-zone, detecting the user device in a second sub-zone, and locating the user device in the second sub-zone when the user device is detected solely in the second sub-zone.

Methods, systems, and computer program products for a mobile device determining its location based on a location of a companion device are described. A mobile device can receive a request for determining a location of the mobile device from an application. The request can include an accuracy specification providing a lower limit on accuracy of the determined location. The mobile device can determine that the mobile device is incapable of achieving that accuracy. The mobile device can then submit a location request to a companion device that has paired with the mobile device. The companion device, upon receiving the location request, can determine a location of the companion device and provide the location of the companion device to the mobile device. The mobile device can then designate the location of the companion device as the location of the mobile device, and provide the location to the application.

The technology enables locating asset tracking tags based on a ramped sequence of signals from one or more beacon tracking tags. The sequence includes at least one minimum power signal and at least one maximum power signal. Each signal in the sequence has a tag identifier and an initial signal strength value. Each beacon signal in the ramped sequence is associated with the time at which that beacon signal was received by a reader. Each beacon signal is also associated with a received signal strength at reception. A location of the beacon tracking tag is estimated according to the signals in the sequence based on the difference between the initial and received signal strengths. A position of the reader device is identified based on the beacon tag's location. An asset tracking tag location is identified based on the reader's location and packets received by the reader from the asset tag.

An operating method of a user terminal, the operating method includes: configuring a first ultra-wide band (UWB) network corresponding to a target user based on first objects including the user terminal dependent on the target user, a UWB communication module including any one or any combination of any two or more of a UWB sensor, a UWB antenna, and a UWB tag; searching for a second UWB network corresponding to a multi-user adjacent to the first UWB network; obtaining, based on a result of the searching, relative position information between the target user and the multi-user by connecting the first UWB network to the second UWB network; and performing, based on the relative position information, interaction and information sharing between the target user and the multi-user.

A sympathetic emergency beacon system including a receiver for emergency beacon transmissions and a transmitter to relay transmissions. Personal Locator Beacons (PLBs), Emergency Position Indicating Radio Beacons (EPIRBs), and Emergency Locator Transmitters (ELTs) are used in emergency scenarios to provide location information regarding downed personnel, vessels, or aircraft. These signals notify search and rescue operations of the location of the distress signal. The sympathetic beacon system computes precise position information regarding the received signal and transmits this computed position information to search and rescue operators for more quickly locating the emergency situation. By automatically relaying the distress signal through a plurality of passive receivers, the present invention strengthens the reliability of emergency locating systems.

Determining a relative location of an object in an environment of a head-mountable device by performing a Wi-Fi round trip time (RTT) process to determine a location of the head-mountable device based on respective round-trip times for a plurality of access points or peer devices, using data generated by an inertial measurement unit as a basis for determining a pose of the head-mountable device, determining a location of a first object in an environment of the head-mountable device, and based at least in part on the location and pose of the head mountable device and the location of the first object, determining a relative location of the first object.

In a server system, a computer-implemented method of initiating a proximity-based communication protocol involving a first and one or more second client devices. For each of plural candidate second devices location coordinates are retrieved and an associated axis aligned bounding box AABB is calculated. When AABB of such candidate second devices overlap with an AABB for the first device, the candidate is presented to the user of the first device. Next, a selection of one or more candidate second devices is received from the first device and causing the protocol to be initiated between the first device and the one or more selected candidate second devices.

A relative position positioning system and a relative position positioning method thereof are disclosed. The method includes the following steps: controlling a plurality of receivers to broadcast a plurality of positioning signals; receiving the plurality of positioning signals and then returning a first reply signal; controlling a plurality of first receivers to transmit a first positioning data to a main device to calculate the plurality of distances to the plurality of first receivers, wherein the plurality of first receivers are devices that have received the first reply signal; returning a second reply signal from the device of interest; controlling a second receiver to transmit a second positioning data to the main device, wherein the second receiver belongs to the plurality of first receivers and has received the second reply signal; and calculating a relative position relationship between the main device and the device of interest.

An indoor positioning method includes: receiving a first measurement parameter obtained by a first device by measuring a second device in a first coordinate system, where the first measurement parameter includes a first angle and a first distance, the first angle is an angle of the second device in the first coordinate system, and the first distance is a distance of the second device relative to an origin of coordinates of the first coordinate system; determining a first spatial position of the second device in the first coordinate system based on the first angle and the first distance; and determining a spatial position of the second device in a geodetic coordinate system based on the first spatial position and a conversion relationship between the first coordinate system and the geodetic coordinate system.