A method for platform relative navigation using range measurements involves four or more transmitters of positioning signals located on and/or near a platform of a first object and a second object approaching the platform that includes three or more receivers for receiving the positioning signals. For each received positioning signal, a range measurement between the transmitter of the positioning signal and the receiver of the positioning signal is performed. The relative position and relative attitude of a body frame of the second object is estimated with regard to the first object by processing the range measurements with a state space estimation algorithm implementing a model of the system of the first and second object.

A method and an apparatus for determining the position and orientation of a mobile transmitter that has at least two linearly polarized antennas arranged at a predefined angle to one another. A plurality of receivers, which can be synchronized with the mobile transmitter and of which the position is known, each receive transmitter signals of predefined carrier frequency via a circularly polarized antenna. A field-theoretical model of the transmission path between the mobile transmitter and receivers is set up and defines the carrier phase measured values, the field-theoretical model is implemented in a Kalman filter, and the receiver signals are evaluated in terms of carrier phase measured values and/or time of arrival values. The position and orientation of the mobile transmitter are determined in the Kalman filter with use of the field-theoretical model and the carrier phase measured values and/or time of arrival values established from the receiver signals.

A method and system for estimating a direction of arrival of a target signal relative to a measuring antenna array of an earth-orbiting satellite. The direction of arrival of the target signal being estimated on the basis of measurement signals corresponding to the target signal received respectively by at least a first measuring antenna and a second measuring antenna of the measuring antenna array. Each of the measurement signals are combined with a reference signal corresponding to the target signal received by a receiving antenna of the satellite. The receiving antenna has a maximum gain greater than the respective maximum gains of the first measuring antenna and of the second measuring antenna. The direction of arrival of the target signal is estimated from the signals obtained by combining the measurement signals with the reference signal.

The invention relates to a flight guidance system for the flight support of a aircraft (1), said system comprising a plurality of fixed ground stations (4a to 4e) respectively comprising a transmitting and/or receiving unit (5a to 5e), and at least one transmitting and/or receiving unit (6) that is arranged on the aircraft (1), the transmitting units being act up to send position signals (7) and the receiving units being set up to receive said position signals (7). The flight guidance system comprises at least one position determination unit (9, 10) that is connected to at least some of the transmitting and/or receiving units (5a to 5e, 6, 6a to 6c) and set up to determine locations of the transmitting and/or receiving unit (6) arranged on the aircraft, according to the position signals (7) that are sent by the fixed transmitting units and received by the at least one receiving unit arranged on the aircraft and/or sent by the at least one transmitting nail arranged on the aircraft and received by the fixed receiving units. The flight guidance system is designed for flight support of the aircraft according to the determined locations.

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.

The present disclosure relates to a system for measurement of antenna alignment of an array antenna system used for wireless communication. The array antenna system has an antenna position ({right arrow over (r)}.sub.AAS) relative a first coordinate system and comprises a control unit and an array antenna having an antenna aperture plane, a certain coverage and an initial array antenna orientation ({right arrow over ()}.sub.AAS.sup.(0)). The array antenna further comprises a plurality of antenna elements and at least two antenna ports, each antenna port being connected to a corresponding subarray, each subarray comprising at least one antenna element. The system comprises the array antenna system and an unmanned aerial vehicle, UAV, arranged to be deployed in the coverage and comprising a UAV antenna arrangement and a positioning module that is adapted to provide UAV position information ({right arrow over (r)}.sub.UAV) relative the first coordinate system.

Apparatus for display of digital content associated with a location of a Node in a wireless communication area. A user interface is generated with a digital representation of content associated with a physical tag or other Node. The user interface includes interactive portions based upon positions in the wireless communication area. The interactive portions may be activated to display the digital content associated with the physical tag in a user interface.

A fence system can determine positions and orientations of objects. The fence system may include fence associated with a fence network that has a plurality of fence nodes. The locations of the fence nodes and fence are defined in a fence coordinate system. A tracked object has a plurality of transient nodes. The fence network may determine the position and orientation of the tracked object based on estimated distances between at least two of the plurality transient nodes and at least two of the plurality of fence nodes. The system may also include a second fence associated fenced object that also has a plurality of transient nodes.

A user equipment (UE) device pointed at an appliance to be controlled, or at an object that is to be accessed or about which information needs to retrieved, determines its position and orientation within an environment with respect to a fixed frame of reference. The appliance to be controlled is identified based on a determined position and orientation of the UE device and a known position of the appliance. The UE device controls the identified appliance by establishing a wireless communication link between the identified appliance and UE device based on a wireless technology that is compliant with both the appliance and the UE device. The UE device may control another appliance via a central control computer server to which the other appliance is interfaced, when the other appliance is not configured for wireless communication.

Technologies for RFID positioning and tracking apparatus and methods are disclosed herein. The apparatus and methods disclose a radio-frequency identification positioning system that includes a radio-frequency identification reader and a phased-array antenna coupled to the radio-frequency identification reader. Techniques are applied to reduce in-reader and in-antenna signal leakages. Techniques are applied to position and track RFID tags. Circuits with leakage cancellation abilities are also disclosed. Reflective vector attenuators with tunable impedance load are also disclosed. Polarization adjustable antennas with matching circuits used in the RFID positioning system are also disclosed. Circuits to re-transmit a received signal at a higher amplitude to enhance radio link range are also disclosed. Techniques are applied to increase the level of scattered radio signals from RFID tags.