A method of determining a two-dimensional position of a moving wireless device is provided. The method comprises obtaining, for each of three or more base stations, one or more measurements of a carrier frequency offset for one or more signals sent between the moving wireless device and the respective base stations. The method further comprises inputting the carrier frequency offset measurements into a model to determine a two-dimensional position of the moving wireless device, in which inputs to the model do not include range measurements for the moving wireless device with respect to the three or more base stations.

Disclosed are various techniques for wireless positioning. In an aspect, a base station calculates statistics of one or more time-angle metrics based on a signal received from a user equipment, and reports the statistics to a network entity, such as a location server, which uses the statistics to estimate a position of the UE. In some aspects, the network entity receives statistics from multiple base stations, which allows the network entity to more accurately determine the position of the UE. In some aspects, the base station reports the statistics to a network entity according to a statistics reporting configuration, which the network entity may provide to the base station.

In accordance with an aspect of the present disclosure, a communication system is provided, comprising: a first ultra-wideband (UWB) transmitter configured to be coupled to a first antenna; a second UWB transmitter configured to be coupled to a second antenna; a controller configured to cause the first UWB transmitter to transmit a first packet to an external communication device, wherein the first packet contains a predefined code; wherein the controller is further configured to cause the second UWB transmitter to transmit a second packet to the external communication device, wherein the second packet contains a cyclically shifted version of said predefined code. In accordance with another aspect of the present disclosure, a communication device is provided, comprising: an ultra-wideband (UWB) receiver configured to be coupled to an antenna, wherein the UWB receiver is further configured to receive at least a first packet and a second packet from an external communication system, wherein the first packet contains a predefined code and the second packet contains a cyclically shifted version of said predefined code; a processing unit configured to correlate the first packet and the second packet received by the UWB receiver with the predefined code. In accordance with further aspects, corresponding methods of operation are conceived, as well as computer programs for carrying out said methods.

A method for determining positions of n target objects, each emitting electromagnetic signals, by m spatially distributed observers, by: carrying out direction-finding measurements by each of the m observers with respect to at least a part of the n targets, collecting the direction-finding measurements by one of the m observers or an external evaluation unit; ascertaining a geometric probability distribution from each of the direction-finding measurements in a partial map; combining the partial maps in order to generate a plurality of possible hypotheses; adding up the possible hypotheses with a respective weighting to form an overall map in order to obtain a marginalized probability distribution that takes all hypotheses into account; and eliminating, step-by-step, hypotheses that are incompatible with the marginalized probability distribution. Also a system for determining positions of emitters from target objects.

A device determines, based on location verification data that has been received, that the device is indoors at a first geographic location. The device determines a base measured barometric pressure, and an initial floor that the device is located on in a structure that includes the first geographic location. The device determines an adjusted measured barometric pressure for a second geographic location based on a second measured barometric pressure for the second geographic location and one or more reference barometric pressures that are associated with a reference location. The device determines an altitude for the second geographic location based on the base measured barometric pressure and the adjusted measured barometric pressures. The device causes a server to predict a floor that the device is located on at the second geographic location and to provide floor data that identifies the floor to an interface that is accessible to the device.

An interference source hunting method of hunting for an interference source of electromagnetic waves while moving between multiple measurement points, includes the steps of acquiring strength information of electromagnetic waves, estimating a distance from the measurement point to the location of the interference source, based on the strength information, calculating a first presence probability that the interference source is present at each position, based on whether a distance from the measurement point to the position is within the distance, updating second presence probabilities acquired in hunting in the past, based on the first presence probabilities, determining a position obtained by moving, by a predetermined distance, the measurement point toward a position with the second presence probability higher than the second presence probability at the measurement point, as a new measurement point, and determining, in a case where a size of an area in which each of the second presence probabilities is greater than or equal to a predetermined value is less than a predetermined value, that the location of the interference source is within the area.

An apparatus, method and computer program is described comprising: generating a first loss function component comprising comparing first location data with first location estimates, wherein the first location estimates are based on channel state data, wherein the first location estimates are generated using a model, and wherein the model comprises a plurality of trainable parameters; generating a second loss function component comprising comparing the first location data with second location estimates, wherein the second location estimates are based on channel state data that have been subjected to a first augmentation and wherein the second location estimates are generated using the model; generating a third loss function component comprising comparing third location estimates based on channel state data and fourth location estimates based on channel state data that have been subjected to a second augmentation, wherein the third and fourth location estimates are generated using the model; and training the trainable parameters of the model by minimising a loss function based on a combination of the first, second and third loss function components.

A method for estimating position of a mobile device which includes receiving, from a network server, observed time difference of arrival (OTDOA) assistance data for a first plurality of cells from a base station almanac (BSA) accessible to the network server. The OTDOA assistance data is stored, within a memory of the mobile device, as a first micro-BSA. A position estimate for the mobile device is determined based upon time difference of arrival (TDOA) measurements associated with an initial subset of the first plurality of cells and initial OTDOA assistance data corresponding to the initial subset of the first plurality of cells. The initial OTDOA assistance data may be generated by the micro-BSA based upon an initial seed estimate.

Techniques are disclosed for determining a true bearing angle from an airborne platform to a source of a radar signal. In an embodiment, a grid is generated based on a coarse range to, and angle-of-arrival of, an electromagnetic signal. The grid represents a geographic area thought to contain the emission source. A measured spatial angle is computed for each pulse of the signal received during a data collection interval. Hypothesized spatial angles are computed for a point in each grid box in the grid. A score is generated for each grid point based on the computed hypothesized spatial angles for the grid point and the measured spatial angles. The grid point having the lowest score is identified as a seed location and is used to launch a Nelder-Mead algorithm that converges on a point in the grid. A true bearing angle to the source of a radar angle is computed to the point provided by the Nelder-Mead algorithm.

The invention relates to a method for geolocating a signal-transmitting device, the geolocation method comprising: a. supplying positions of a plurality of stations and dates of reception of the radio signal by said stations, b. selecting a reference station, c. defining a scanning zone, d. subdividing the scanning zone as a function of a scanning granularity, e. for each subzone, calculating a degree of cumulative error of said subzone, f. selecting a subzone exhibiting a minimal degree of cumulative error, g. defining a new scanning zone, h. defining a new scanning granularity, i. iterating the method from the step d).