First information is obtained from a sensing device at a first time. The first information corresponds to a radio signal received at the device from a candidate location. The device is at a first location at the first time. Second information is obtained from the device at a second time. The second information corresponds to a radio signal received at the device from the candidate location. The device is at a second location at the second time. A system determines that a pattern is in each of the first and second information and determines relationships between the candidate location and the device at each first and second location. The system obtains inverses of the relationships and determines estimates of the received radio signals based on the information and inverses. The system measures or estimates energy emitted from the candidate location based on the estimates.

A system and method applicable for determining the positions of radio tags based on triangulation and respective radio tag signals transmitted from each radio tag, where each of a set of base stations is configured to transmit a radio base signal including an identifier that uniquely identifies the base station, and other base stations of the set of base stations receive the radio base signal and forward received base station messages to a central control unit which determines a position for any added base station using triangulation and known positions for base stations already included in the system, in order to facilitate expanding the number of base stations in the system.

A computing device obtains an instance of radio observation data and an associated circumstance parameter. The instance of radio observation data indicates an observed signal strength a radio node observed by a mobile device. The circumstance parameter indicates a characteristic of motion of the mobile device and/or a characteristic of the environment about the mobile device when the instance of radio observation data was captured. The computing device determines a context associated with the instance of radio observation data based at least in part on the circumstance parameter; determining a context-specific signal strength correction based at least in part on the context; generates a corrected signal strength of the radio node based on the observed signal strength and the signal strength correction; and generates and/or updates a radio map based at least in part on the corrected signal strength of the at least one radio node.

According to an example embodiment, there is provided a base station apparatus configured to store an initial planned location of the apparatus, to receive first messages from a master base station, each first message comprising a first timestamp indicating a transmission time of the first message, and to transmit second messages, each second message comprising a second timestamp indicating a transmission time of the second message and a location estimate of the apparatus, to receive second messages from peer apparatuses, and to receive third messages from the master base station, and configured to to determine a location of the apparatus by performing an iterative process, wherein each iteration comprises determining an updated location estimate of the apparatus based on a received first message, received at least one second message and a received third message, and determining a quality criterion of the updated location estimate of the apparatus.

An ultra-wideband-based object identification method and system includes: transmitting, using a transmitter, an ultra wideband signal to an object; receiving, using a receiver, a reflected signal from the object; and determining, using a processor, an identity of the object based on the received reflected signal.

An information processing apparatus includes: a first receiving unit that receives a radio signal through a first wireless communication channel; a second receiving unit that receives a radio signal through a second wireless communication channel in which position measurement accuracy and radio wave reachable range are higher and shorter respectively than those in the first wireless communication channel; a calculation unit that calculates information on position of the information processing apparatus by using field intensity of the radio signal received by the first or second receiving unit; and a control unit that causes the calculation unit to calculate the information based on the radio signal received by the first receiving unit, and, if a preset condition is satisfied, performs switching control to cause the calculation unit to calculate the information based on the radio signal received by the second receiving unit.

A method and apparatus for cooperative positioning is disclosed herein. A method for cooperative positioning performed by a target device includes: scanning a beacon signal transmitted by at least one peripheral device; determining whether at least one peripheral device exist within a reference radius based on the beacon signal; when the at least one peripheral device is within the reference radius, transmitting a cooperative positioning request to the at least one peripheral device; receiving, in response to transmitting the cooperative positioning request, location of the at least one peripheral device and a degree of reliability for the location of the at least one peripheral device; and determining a location of the target device based on the location and the degree of reliability.

A system for recognizing the location of a subject, comprises a server, signal transceivers, and a tracking device. The server transmits a request and stores a map file. The signal transceivers respectively communicate with the server to receive the request, and broadcast a reference signal to the other signal transceivers. The tracking device bidirectionally communicates with the signal transceivers, and periodically sends a tracking signal. After each of the signal transceivers obtains the first received signal strength indicator corresponding to the received reference signal and the second received signal strength indicator corresponding to the received tracking signal, each transmits the first signal strength indicator and the second signal strength indicator to the server. The server determines relative position information for the at least one tracking device within the map file according to the first signal strength indicators, the second signal strength indicators, and location information from the signal transceivers

An ultra-wideband (UWB) localization method, a UWB localization device, and a UWB localization system are provided. The UWB method includes: determining whether or not a plurality of UWB hardware measurement deviations are calibrated; determining, when the UWB hardware measurement deviations are calibrated, whether or not a plurality of anchor coordinates of anchors are automatically measured; obtaining, when the anchor coordinates of the anchors are automatically measured, a plurality of measurement distances between each of the anchors and a tag, respectively, and deducting the UWB hardware measurement deviations from the measurement distances, respectively; and calculating a tag coordinate of the tag according to the measurement distances from which the UWB hardware measurement deviations are deducted.

A mobile station improves its position estimate using dead reckoning and wireless signal distance estimates. The mobile station calculates a first round trip time (RTT) based distance at a first mobile station position between the first mobile station position and an access point. The mobile station moves to a second position and calculates a dead reckoning transition distance between the first mobile station position and the second mobile station position. The mobile station calculates a wireless signal transition distance between the first mobile station position and the second mobile station position based on a second RTT-based distance calculated between the access point and the second mobile station position. The mobile station computes an uncertainty associated with the first RTT-based distance and/or the second RTT-based distance using the dead reckoning transition distance and the wireless signal transition distance. The mobile station can correct the first RTT-based distance or the second RTT-based distanced based on comparing the dead reckoning transition distance with the wireless signal transition distance.