The invention relates to a method for validating at least one position stored in a database of an aircraft comprising a satellite positioning system, the database containing at least one radionavigation beacon position, a runway threshold position, and a displaced runway threshold position on a runway, on which the aircraft is intended to land, the validation of said at least one position comprising a consistency check between at least: a signal received by the aircraft from a radionavigation beacon associated with said at least one position, and the position of the aircraft provided by the satellite positioning system, and the value of the position stored in the database.

An enhanced Long Range Navigation (eLORAN) system may include an eLORAN controller configured to obtain satellite-derived conductivity data and satellite-derived temperature data for different geographical positions and generate eLORAN correction factors based thereon. The eLORAN system may also include eLORAN transmitter stations. The eLORAN system may also include an eLORAN receiver device that may include an eLORAN receive antenna and an eLORAN receiver coupled to the eLORAN receive antenna and configured to receive the eLORAN correction factors. The eLORAN receiver device may also include a controller coupled to the eLORAN receiver. The controller may be configured to cooperate with the eLORAN transmitter stations to determine an eLORAN receiver position corrected based upon the eLORAN correction factors.

Systems and methods for detecting a site maintenance operation done by a maintenance device are described. At least one motion sensor and at least one localization sensor can each be operatively coupled to the maintenance device to detect one or more motion parameters of the maintenance device via the motion sensor and the localization sensor. The maintenance device can be localized (e.g., its position located) on the indoor map. A movement of the maintenance device can be characterized and/or tracked on the indoor map. A motion map can be displayed to illustrate (e.g., visually represent) the characterized movement. An offsite computer can be used to determine whether the site maintenance operation has commenced at the indoor location, measure one or more maintenance parameters of the site maintenance operation and/or compare the one or more maintenance parameters to predetermined benchmark parameters to determine whether the site maintenance operation has been completed.

A terrestrial based positioning system includes a plurality of location anchors configured to transmit and receive ultra-wide band (UWB) signals. In another aspect, a location tag configured to transmit and receive UWB signals uses signals transmitted by location anchors to determine its current position. In some implementations, a location tag may use Global Positioning System (GPS) signals or a combination of UWB and GPS signals to determine a current location. The location anchors are organized into zones used by the locations tags to determine a current position based in UWB signals. In some implementations, the locations anchors automatically create the necessary zones. Location anchors may also automatically determine the position of other location anchors. In yet other implementations, the location anchors relay data transmitted by a location tag. In addition, a location anchor may transmit GPS signals that can be used by standard GPS receivers.

A system for calibrating a transmitting unit includes an arrangement of at least four transmitting units. A first transmitting unit has stored position data with respect to a setpoint position of the first transmitting unit. The first transmitting unit is designed to emit a first transmission signal to each of the three remaining transmitting units, each of which is designed to receive the first transmission signal and, thereafter, to return a first response signal to the first transmitting unit. The first transmitting unit is designed to determine its relative position data with respect to the three remaining transmitting units on the basis of the first response signals returned and to detect a deviation between the stored position data and the relative position data determined and to carry out a calibration of a transmission parameter of the first transmitting unit on the basis of the detected deviation.

An object monitoring system including a plurality of location beacons, each location beacon being configured to generate a location broadcast message indicative of a beacon location and a tag associated with a respective object in use. The includes a tag memory configured to store object rules, a tag transceiver configured to transmit or receive messages and a tag processing device configured to determine context data at least partially indicative of a tag context by at least one of determining a tag location in accordance with at least one location broadcast message received via the tag transceiver from at least one of a plurality of location beacons and using stored context data, use the object rules and the context data to identify a trigger event, determine an action associated with the trigger event and cause the action to be performed.

Various embodiments of the present invention provide systems and method for monitoring of physical movement in relation to regions where movement is either unconditionally or conditionally unauthorized.

The object of the invention relates to a method for the calibration of a transceiver device (T) including providing a first calibration device (A) arranged at a distance (D1) from the transceiver device (T), and a second calibration device (B) suitable for detecting electromagnetic wave signals arranged at a distance (D2) from the transceiver device (T) and at a distance (D) from the first calibration device (A), emitting a first calibration wave signal (k1) using the first calibration device (A), which is detected by means of the transceiver device (T) and the second calibration device (B), generating and emitting a response wave signal (v) by means of the transceiver device (T), which is detected by means of the second calibration device (B), then determining the delay constant formed as the sum of the transmission and receipt delays of the transceiver device (T) on the basis of the distances (D, D1, D2), the time intervals (B1B2, T1 T2) between the emitting and receipt of the wave signals (k1, k2, v) and the speed of propagation (c) of the wave signals using the formula (I) and adding the delay constant to the measured time interval T1 T2. The object of the invention also relates to a system (100) for the implementation of the method according to the invention.

An enhanced LOng RAnge Navigation (eLORAN) system may include a plurality of eLORAN transmitter stations, and at least one eLORAN receiver device. The eLORAN receiver device may include an eLORAN receive antenna, an eLORAN receiver coupled to the eLORAN receive antenna, and a controller coupled to the eLORAN receiver. The controller may be configured to cooperate with the eLORAN transmitter stations to determine an eLORAN receiver position and receiver clock error corrected from additional secondary factor (ASF) data, the ASF data based upon different geographical positions and different times for each different geographical position.

A method includes obtaining signal information corresponding to a plurality of radio signals received at two or more sensing devices from a candidate location, determining a plurality of reconstructed signals based on the signal information, determining time-estimates and frequency-estimates based on a correlation between the plurality of radio signals and the plurality of reconstructed signals, determining metadata corresponding to the plurality of radio signals based on the signal information, the time-estimates, or the frequency-estimates, transmitting at least a portion of the metadata to an information combining node, obtaining the portion of the metadata from the information combining node, determining a relationship between the metadata, and determining the candidate location based on the metadata and the relationship between the metadata. Transmission of the plurality of radio signals to the information combining node is restricted based on a bandwidth of the two or more sensing devices or the information combining node.