An electronic device may include a plurality of antennas, a memory storing at least one reference data, and a processor. The processor may be configured to obtain context information associated with a state of the electronic device, when the context information meets a first specified condition, determine phase difference information corresponding to signals obtained using the plurality of antennas based on first specified reference data, when the context information meets a second specified condition, determine phase difference information corresponding to signals obtained using the plurality of antennas based on second specified reference data, and determine a relative location of an external electronic device with respect to the electronic device based on the determined phase difference information.

A tracking device uses user-guided trilateration to determine a current location of the tracking device. The tracking device receives a request to locate the tracking device from a user of a mobile device communicatively connected to the tracking device. The tracking device receives a series of locations of the mobile device and corresponding distances between the mobile device and the tracking device at each of the locations. The tracking device provides instructions to the user of the mobile device to move to each of the series of locations to collect location and distance data. The tracking devices performs a trilateration operation on the series of locations and corresponding distances to determine a location of the tracking device and provides the determined location to the mobile device for display.

Apparatuses, methods, systems, and program products are disclosed for triangulating a device's location using short-range wireless signals. An apparatus includes a processor and a memory that stores code executable by the processor. The code is executable by the processor to receive a request to determine a location of a first device, determine locations of a plurality of second devices that are within a short range wireless communication proximity of the first device, triangulate the location of the first device based on the locations of the plurality of second devices, and report the triangulated location of the first device.

Systems and methods for determining user equipment (UE) locations within a wireless network using reference signals of the wireless network are described. The disclosed systems and methods utilize a plurality of in-phase and quadrature (I/Q) samples generated from signals provided by receive channels associated with two or more antennas of the wireless system. Based on received reference signal parameters the reference signal within the signals from each receive channel among the receive channels is identified. Based on the identified reference signal from each receive channel, an angle of arrival between a baseline of the two or more antennas and incident energy from the UE to the two or more antennas is determined. That angle of arrival is then used to calculate the location of the UE. The angle of arrival may be a horizontal angle of arrival and/or a vertical angle of arrival

A system and method for locating radio-frequency identification tags within a predetermined area. The method can incorporate sub-threshold superposition response mapping techniques, alone, or in combination with other methods for locating radio-frequency identification tags such as but not limited to time differential on arrival (TDOA), frequency domain phase difference on arrival (FD-PDOA), and radio signal strength indication (RSSI). The system can include a plurality of antennas dispersed in a predefined area; one or more radio-frequency identification tags; a radio-frequency transceiver in communication with said antennas; a phase modulator coupled to the radio-frequency transceiver; and a system controller in communication with said transceiver and said phase modulator. Calibration techniques can be employed to map constructive interference zones for improved accuracy.

A radar system for providing position information to a mobile unit is provided. The radar system comprises a receiving interface. The receiving interface is adapted to receive radio frequency, RF, signals. The radar system further comprises a processing unit. The processing unit is adapted to process the received RF signals. The processing unit is adapted to determine an occupation of a predetermined time-frequency space by the received RF signals. The radar system further comprises a transmitting interface which adapted to transmit information on an intention of the radar system to occupy a specific portion of the predetermined time-frequency space. The radar system further comprises a plurality of beacon units. The beacon units are adapted to provide position information of the radar system on the specific portion in the predetermined time-frequency space, when it is determined that the specific portion of the predetermined time-frequency space is not occupied.

A position determining device for determining the position of an object with reference to the position determining device, the position determining device encompassing: a transmitting device at a first location; a receiving device at a second location, the receiving device being configured for reception of a transmitted signal from the first transmitting device, and for determination of a transit time of the transmitted signal from the transmitting device to the object and from the object to the receiving device, the first location and the second location being at a distance from one another, and the position determining device being configured to determine, from the transit time, an ellipse on which the object lies and which has the first location and the second location as foci.

In an embodiment, a method for air-writing character recognition includes: determining a position of an object in a monitoring space using trilateration by using a plurality of millimeter-wave radars, where each millimeter-wave radar of the plurality of millimeter-wave radars has a field of view, and where an intersection of the fields of view of the plurality of millimeter-wave radars forms the monitoring space; tracking the position of the object in the monitoring space over time using the plurality of millimeter-wave radars; determining a character symbol depicted by the tracked position of the object over time using a neural network (NN); and providing a signal based on the determined character symbol.

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for multistatic radar communications. In some implementations, a transmitting device may transmit, to a receiving device, a radar alert frame followed by a codeword and one or more radar pulses. The radar pulses are transmitted, using beamforming, in a number of directions. The timing information indicates a timing offset or delay between one or more codewords of the codeword sequence and the beginning of the radar pulses. The receiving device may detect one or more codewords of the codeword sequence and an echo of at least one of the radar pulses, and determine the time at which the corresponding pulse was transmitted by the transmitting device. The receiving device may compare the timing of the echo with the timing of the transmitted pulse to determine a relative distance of an object that produced the echo.

The present invention discloses a method and a system for navigating an Autonomous Ground Vehicle (AGV) using radio signal and vision sensor. The method comprising generating a trajectory plan for a short distance from a path plan, wherein the path plan is determined using destination location and AVG location, identifying an approximate AGV location using a radio signal-based trilateration mechanism, estimating AGV location error with respect to a road lane centre by determining distance from the approximate AGV location to road boundary and road lane marking line and orientation difference between AGV orientation and road orientation, and correcting the trajectory plan by using the estimated AGV location error for navigating an AGV.