The invention relates to a method for determining an adjusted position (63, 64) of a mobile entity in an area (90) of a mobile communications network based on a reference position (61, 62) of the mobile entity in the area (90), the area being divided into different pixels (91). The method comprises determining the reference position (61, 62) of the mobile entity in the area (90), determining, for each pixel (91) of the area (90), a predicted signal level of a radio frequency field of the mobile communications network for the mobile entity, determining, for each pixel (91) of the area (90), a mobile traffic density indicating an expected density of the mobile traffic of the mobile communications network in the area, and determining, for the area (90), a probability matrix (200) of the area based on the reference position (61, 62), the predicted signal level and the mobile traffic density, the probability matrix indicating a likelihood that the mobile entity is located in the corresponding pixel of the area. The method further comprises selecting one of the pixels for the mobile entity based on the probability matrix (200), the selected pixel corresponding to the adjusted position (63, 64) of the mobile entity in the area.

A method for controlling an aircraft includes storing data aboard the aircraft. The data include the relative positions of radar targets disposed within a region adjacent to the runway. The region is scanned with a radar aboard the aircraft to obtain data corresponding to the relative positions of radar reflections from the region, including reflections from the radar targets. The data corresponding to the radar targets is distinguished from the data corresponding to the radar reflections from the region using correlation techniques. The position and attitude of the aircraft relative to the runway is then assessed using the stored data and the data corresponding to the radar targets. The position and attitude of the aircraft relative to the runway is also evaluated using an independent navigation system. The difference between the assessed position and attitude and the evaluated position and attitude is then used to control the aircraft.

A positioning method and apparatus include obtaining, by a terminal, an outdoor positioning result using an outdoor positioning service, attempting, by the terminal when information about a satellite that provides the outdoor positioning service meets a preset condition, to obtain an indoor positioning result using an indoor positioning service, where the preset condition indicates that the terminal has an indoor positioning requirement, and switching, by the terminal, from the outdoor positioning service to the indoor positioning service when the indoor positioning result is successfully obtained.

A received signal DOA estimation method using generation of virtual received signals includes: generating a preset number of virtual antennas at preset positions of a plurality of actual antennas; generating received signals received from the virtual antennas; and generating a DOA estimation value through a DOA estimation algorithm using the received signals received from the virtual antennas and the received signals received from the actual antennas.

An interference detection system in a network identifies a first wireless station that has experienced radio frequency (RF) interference from an unknown source on at least one physical resource block (PRB) and identifies one or more second wireless stations that have experienced similar interference on the at least one PRB. A plurality of estimated interference source locations are determined based at least on geographic locations of the first wireless station and the one or more second wireless stations. The plurality of estimated interference source locations are scored based on a comparison of estimate interference to observed interference at the one or more second wireless stations and a geographical map is generated based on the scored plurality of estimated interference source locations, wherein the geographical map includes indicia indicative of the relative scores of the plurality of estimated interference source locations

A method for locating wireless tags is described. A signal including a RoomID generated by a transceiver is received by a wireless tag. The RoomID identifies a room corresponding to the transceiver and the wireless tag receives the signal asynchronously without being synchronized with the transceiver. A tracking packet including the RoomID and an identifier of the wireless tag is broadcasted by the wireless tag. The tracking packet is received by an access point which provides the tracking packet to a localization system that determines a location of the wireless tag based on the RoomID.

Disclosed is an approach to enable radio map download for Global Navigation Satellite System (GNSS)-denied areas. In particular, processor(s) (e.g., of positioning server(s)) could identify GNSS-denied area(s) in an initial radio map, the GNSS-denied area(s) being (i) one or more areas in which at least one GNSS signal is or was unavailable and (ii) a subset of a plurality of areas represented by the initial radio map. Subsequently, the processor(s) could generate a partial radio map representing radio data only for the GNSS-denied area(s) identified in the initial radio map, and could then transmit the partial radio map to a mobile device for storage at the mobile device. In this way, the mobile device could optimize resource usage and perform radio-based position estimations at least in the GNSS-denied area(s) that were identified.

A location engine uses the empirical measurements made by a scouting wireless terminal (i) to discover the existence of a reference radio within a geographic region; (ii) to generate an estimate of the location of the newly-discovered reference radio, and (iii) to generate an estimate of the transmission power of the downlink control channel radio signal transmitted by the newly-discovered reference radio. The location engine then uses: (i) the estimate of the location of the newly-discovered reference radio, and (ii) the estimate of the transmission power of the downlink control channel radio signal transmitted by the newly-discovered reference radio, and (iii) measurements, made by a user wireless terminal, of the power of each of the downlink control channel radio signals transmitted by each of the reference radios to generate an estimate of the location of the user wireless terminal.

The location system includes two measurers apart from each other and configured to measure first and second variables in accordance with times of arrival of radio waves and first reception strengths, respectively; a memory configured to store first data associating a plurality of zones with first and second reference variables corresponding to times of arrivals of radio waves with respect to the two measurers for a case where the radio waves are transmitted from the plurality of zones, and second data associating the plurality of zones with first and second reference reception strengths with respect to the two measurers for the case where the radio waves are transmitted from the plurality of zones; and a processor configured to identify from among the plurality of zones a zone having a highest probability of including a position from where radio waves are transmitted.

A system may include at least one computer-readable storage medium including a set of instructions for locating a wireless device having wireless fidelity (WiFi) capability, and at least one processor in communication with the computer-readable storage medium, wherein when executing the set of instructions, the at least one processor is directed to: obtain a positioning request from the wireless device, the wireless device is in communication with at least one WiFi network; obtain WiFi data from the wireless device; and determine a default location associated with the WiFi data as a location of the wireless device.