A method for locating an interferer is provided. The method includes determining, from one of a time difference of arrival (TDOA) signature and a frequency difference of arrival (FDOA) signature between a first signal received at a satellite at a first location and a second signal received at the same satellite at a second location, a first curve on which the interferer lies, determining, from direction of arrival information generated using signals received from the interferer at a plurality of elements of a linear array on the satellite, a second curve on which the interferer lies, and determining, based on an intersection between the first and second curves, the location of the interferer.

A user equipment (UE) initiates a positioning session based on ranging in a distributed system of UEs. The positioning session includes a plurality of anchor UEs with known positions that provide information including ranging information and their positions to the initiator UE in post-ranging messages. The initiator UE identifies anchor UEs that provide information that does not significantly contribute to the final position estimate for the initiator UE. The initiator UE, for example, may generate position estimates and associated accuracy levels for different subsets of anchor UEs and may use the accuracy levels to identify a subset of anchor UEs that may be used for positioning in place of the full set of anchor UEs without a significant loss of accuracy. Selected UEs are excluded from providing post-ranging messages in subsequent positioning sessions to reduce signaling overhead and improve efficiency.

A method for determining geo-position of a target by an aircraft includes: receiving navigation data related to the aircraft including aircraft attitude information; receiving multilateration information related to the target including an angle to the target; calculating an axis for a cone fixed to the aircraft, based on the received aircraft attitude information; calculating a central angle for the cone from the received angle to the target; generating two vectors orthogonal to the cone axis; calculating a cone model from the axis, the central angle and the two vectors; and intersecting the cone model with an earth model to obtain a LEP curve, wherein the LEP curve is used to determine the geo position of the target.

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.

A location relationship obtaining method includes recording, as a reference location point corresponding to a searched terminal, a location point for obtaining a wireless signal having greatest strength, obtaining at least two reference location points, setting either of the at least two reference location points as a benchmark location point, and obtaining a reference location relationship between the other reference location points and the benchmark location point, where the reference location relationship indicating a location relationship between a searched terminal corresponding to the other reference location points and a searched terminal corresponding to the benchmark location point.

A method of estimating the location of a signal source comprises, by a processing unit: determining ΔΔφ.sup.m,n which represents a difference between accumulated phases of signals, S.sub.m and S.sub.n, received by at least one pair of the receivers, determining a first estimate of the location of said signal source based on position data and ΔΔφ.sup.m,n of said at least one pair of receivers, said first estimate being associated with an accuracy area, determining data representative of difference in times of arrival of modulation patterns of the signals S.sub.m, S.sub.n, wherein said data comprise an ambiguity, and for said at least one pair of receivers, using at least said data representative of difference in times of arrival of the modulation patterns of the signals, ΔΔφ.sup.m,n, and said accuracy area, to obtain second estimates ê.sub.Src.sup.k of the source location, at least some of them being located within the accuracy area

A device for estimating a fixed position of a wireless communication is provided. The device comprises a radio connected to an antenna array, a memory and a process. The radio can receive a first signal transmitted from a first direction by the wireless communication device to the movable device, and a second signal transmitted from a second direction by the wireless communication device to the movable device. The processor can calculate a first angle of arrival (AOA) a second AOA. The processor can estimate the fixed position of the wireless communication device based on the first AOA, the second AOA, the first position and the second position.

Disclosed is a technique that can provide one or more countermeasures against spoofers. A beamformer can control an antenna pattern of a CRPA to generate a survey beam. The survey beam is swept across space to determine a characteristic signature based on carrier-to-noise ratios (C/No) for particular space vehicle signals. Matching C/No signatures can be used to identify the existence of spoofers and invoke a countermeasure, such as nulling.

Apparatus, methods and computer program products for user equipment positioning solutions and related signalling. An apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to at least send (550), to a network node of a communication network, at least one signaling configuration with at least one set periodicity, wherein the at least one signaling configuration is for use at the network node in calculating at least position information for relaying to the communication network at least for positioning support of the apparatus, and receive (570) the positioning support from the communication network in response to the at least one signaling configuration.

Systems and methods for mobile platform localization for a mobile platform. The system includes three independent ultra-wideband (UWB) sensors mounted on the mobile platform and a UWB localization module operationally coupled to the first UWB sensor, the second UWB sensor, and the third UWB sensor, and programmed by programming instructions to: identify first beacon UWB transmissions from a first beacon external to the mobile platform and generate a spatial location of the first beacon; identify second beacon UWB transmissions from a second beacon external to the mobile platform and generate a spatial location of the second beacon; identify third beacon UWB transmissions from a third beacon located external to the mobile platform; and generate a spatial location of the mobile platform, as a function of the spatial location of the first beacon, the spatial location of the second beacon, and the spatial location of the third beacon.