A positioning system comprising a processing system (7; 9) configured to receive a first position estimate for a mobile device (7), and to receive data representative of an acoustic signal received by the mobile device (7) from one of a plurality of acoustic transmitter units (2, 3, 4, 5). For each of the acoustic transmitter units (2, 3, 4, 5), the processing system (7; 9) determines spatial likelihood data representative of a likelihood of the received acoustic signal having been transmitted by the respective acoustic transmitter unit by comparing a time-of-flight range value with a geometric distance value, representative of a distance between the acoustic transmitter unit and the first position estimate. The processing system (7; 9) processes the spatial likelihood data to identify a subset of the acoustic transmitter units, and processes information relating to the positions of the acoustic transmitter units in the identified subset and/or relating to the acoustic signals transmitted by the acoustic transmitter units in the identified subset, to determine a second position estimate for the mobile device (7).

A method for localizing a user device using a Time of Flight (ToF) antenna array disposed on a vehicle, the method includes determining, via a ToF localization controller, that the user device is less than a threshold distance from the vehicle, determining an angle of arrival via the ToF localization controller and the ToF antenna array, and generating an unlock signal that unlocks a vehicle door responsive to determining that the user device is less than the threshold distance from the vehicle door.

A location information server includes: an acquisition unit configured to acquire received signal strengths of radio signals transmitted from a transmitter and received at a receiver; an estimation unit configured to estimate a location of the transmitter or receiver, using at least the top three received signal strengths among the acquired received signal strengths; and a reliability calculation unit configured to calculate a reliability of the location estimation based on the received signal strengths that have been used.

Locating systems and methods for wireless seat belt monitoring in vehicles with removable or reconfigurable seats are provided herein. An example remote transceiver can be centrally located on a seat that is configured to be rearranged within a vehicle. The remote transceiver can include a processor and memory for storing instructions that include a unique code identifying the remote transceiver. The processor executes the instructions to receive low power signals from transmitters within an interior of the vehicle, determine received signal strength values of the low power signals. The received signal strength values are used by the vehicle receiver to determine a location of the remote transceiver within the vehicle.

A method and apparatus a first network entity in a wireless communication system supporting ranging capability is provided. The method and apparatus comprises: identifying, in a ranging block, one or more ranging rounds to transmit a ranging control message (RCM) with a multiple message receipt confirmation request (MMRCR) for a transmission of at least one first message comprising at least one of a set of ranging messages or a set of ranging ancillary data messages; transmitting, to a second network entity, the RCM with the MMRCR; transmitting, to the second network entity, ranging ancillary data in at least one ranging round of one or more ranging rounds following the RCM, wherein the ranging ancillary data is associated with the MMRCR; and receiving, from the second network entity, a ranging multiple message receipt confirmation (RMMRC) corresponding to the transmission of the at least one first message.

Systems, apparatus, articles of manufacture, and methods are disclosed for distributed and scalable high performance location and positioning. Disclosed example apparatus are to enqueue a data pointer associated with sounding reference signal (SRS) measurement data from a device into a first data queue associated with a first worker core. Disclosed example apparatus are also to generate, with the first worker core, at least one of a reception angle measurement dataset or a time-of-arrival measurement dataset based on the SRS measurement data and dequeue the data pointer associated with the at least one of the reception angle measurement dataset or the time-of-arrival measurement dataset from the first data queue into a second data queue associated with a second worker core. Disclosed example apparatus are further to determine, with the second worker core, a location of the device based on the at least one of the reception angle or time-of-arrival measurement dataset.

A location position system can include a plurality of beacons arranged a grid formation divided into a plurality of sub-grids. A mobile computing device can implement a location position application and can receive a radio signal from a particular beacon of the plurality of beacons. The radio signal can comprise a data component uniquely identifying the particular beacon, which can be used to identify a particular sub-grid of the plurality of sub-grids. An audio signal can be received from each of a set of sub-grid beacons associated with the particular sub-grid. Each audio signal can: (i) have a frequency in the frequency range of 16 kHz to 24 kHz and a transmission delay from a reference time, (ii) lack any additional identifying data, and (iii) be separately transmitted from the radio signal transmitted by the particular beacon. The mobile computing device can determine its position based on the received audio signals.

Co-channel beacon transmissions are provided with at least one of spectral redundancy and temporal redundancy. A receiver produces a snapshot of a superposition of received co-channel beacon transmissions. Subcarrier demodulation, code nulling, or a Class-C linear minimum-mean-square error (MMSE) operation separates multiples ones of the co-channel beacon transmissions or eliminates inter-symbol interference and inter-subcarrier interference in the snapshot. Receiver operations can be performed at a network user, a network node, or a network operations center.

A first estimation unit estimates, based on pieces of information on the reception strength acquired by an acquisition unit in a first time period, a location of a transmitter. A first determination unit determines, based on the location of the transmitter estimated by the first estimation unit, an area in which the transmitter is present. A second estimation unit estimates, based on pieces of information on the reception strength acquired in a second time period, the location of the transmitter. A second determination unit determines, based on the location of the transmitter estimated by the second estimation unit, the area in which the transmitter is present. A correction unit corrects, when a determination result by the first determination unit is different from a determination result by the second determination unit, the determination result by the first determination unit to the determination result by the second determination unit.

There is provided a method and apparatus for tracking a device. The tracked device may be a wearable device worn by a user participating in an athletic activity. An anchor device is positioned with respect to a playing area and receives signals from the tracked device. The anchor device estimates the position of the tracked device by measuring a distance and direction of the signal, and decodes the signal to obtain measurements taken by the tracked device. The position and the measurements are combined to produce tracking data for the device.