A method includes calculating, by a mobile station, a second coordinate according to a first coordinate and a first observation value of a first base station, and a second observation value published by a second base station; and determining, according to the calculated second coordinate, whether there is a deviation in a third coordinate published by the second base station. When there is a deviation in the third coordinate, calculating location information of the mobile station according to the second coordinate and the observation value of the second base station, wherein the first coordinate and the first observation value are information used for calculating the location information of the mobile station before base station is switched. The first base station publishes the coordinate to the mobile station before base station is switched; and the second base station publishes the coordinate to the mobile station after base station is switched.

An operation method of an electronic device for transmitting and receiving data through an ultra wideband (UWB) in a wireless communication system includes: transmitting, to another electronic device, a first ranging control message; transmitting, to the other electronic device, a ranging start message based on the first ranging control message; and receiving, from the other electronic device, a ranging response message based on the first ranging control message.

A system and method for determining an Angle of Arrival (AOA) for frequency modulated communications. The system may include first and second antennas spaced apart from each other by a distance, and configured to receive wireless communications in the form of a modulated signal. The system may determine a phase difference between the received signals based on one or more samples of a dedicated portion of the received signals, where one or more aspects of the dedicated portion is variable.

Techniques for determining a range between a wireless station (STA) and a wireless access point (AP) using channel state information are described. An AP determines channel state information corresponding to an STA. The AP determines, based on the channel state information, one or more fine timing measurement (FTM) parameters. A plurality of FTM messages are transmitted between the AP and the STA, based on the one or more FTM parameters. The STA is configured to determine an estimated range to the AP based on the plurality of FTM messages.

A system and method for determining a position or a movable device is disclosed. The present system utilizes a movable device equipped with a locator device that has an antenna array such that it may determine the angle of arrival of a plurality of incoming beacon signals. In certain embodiments, the movable device is also able to measure its distance travelled. By knowing its distance moved and the angle of arrival from each beacon, the locator device is able to calculate its position as well as the position of each beacon. This procedure may be executed at regular intervals so that the movable device accurately determines its position.

Embodiments provide a location information obtaining method and a device, and relates to the communications field. The method includes: obtaining, by a network device, location information of a reference point and location information of first user equipment; determining, by the network device, relative location information of the first user equipment relative to the reference point; and sending, by the network device, the location information of the reference point and the relative location information of the first user equipment relative to the reference point.

A surgery navigation system according to the present invention includes: a positioning module including: a transceiver unit, configured to transmit a frequency modulated signal; multiple positioning marks, which are separately disposed on each vertebra of a spine and configured to transmit the positioning mark frequency signal to the transceiver unit after receiving the frequency modulated signal; and a surgical instrument, which transmits the instrument frequency signal to the transceiver unit after receiving the frequency modulated signal; and a processing unit, which obtains a distance between the positioning marks and the transceiver unit through calculation according to a difference between the positioning mark frequency signal and the frequency modulated signal, and obtains space coordinates of the spine through calculation according to the distance; and obtains a distance between the surgical instrument and the transceiver unit through calculation according to a difference between the instrument frequency signal and the frequency modulated signal, obtains space coordinates of the instrument through calculation according to the distance, and performs a surgery navigation operation according to the space coordinates of the spine and the space coordinates of the instrument.

A distance data between the portable device and the vehicle-side transmission and reception device is acquired. A movement speed of the portable device is calculated based on a change between a current distance data and a previous distance data. A position estimation distance for estimating the position of the portable device with respect to the vehicle is updated when the movement speed is less than a first speed. The position estimation distance is not updated when the movement speed is equal to or larger than the first speed. The position of the portable device is estimated according to the position estimation distance.

A device may determine a set of orientations or relative displacements at a set of locations. The set of locations may include at least a first location and a second location. The device may determine a set of sensor measurements relating to one or more measurable parameters at the set of locations. The device may determine, based on the set of orientations or relative displacements at the set of locations and the set of sensor measurements relating to the one or more measurable parameters at the set of locations, a path relating to the set of locations. The device may perform an action based on determining the path.

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.