Navigation beacons may be trained to receive signals of opportunity from one or more vehicles, to recognize their own position based on such signals, and to transmit information regarding their own position to one or more other vehicles accordingly. The navigation beacons may be of small size and feature a basic construction including one or more transceivers, power sources and the like, and may communicate via a Bluetooth® Low Energy, Ultra Wideband or long-range low-power wireless standard, or any other standard. The navigation beacons may be installed in any location, preferably being mounted to one or more existing fixed structures or facilities (e.g., transportation structures or facilities), and may operate in active and/or passive modes when learning their positions or servicing position information to one or more remote devices.

In some implementations, a UAV flight system can dynamically adjust UAV flight operations based on radio frequency (RF) signal data. For example, the flight system can determine an initial flight plan for inspecting a RF transmitter and configure a UAV to perform an aerial inspection of the RF transmitter. Once airborne, the UAV can collect RF signal data and the flight system can automatically adjust the flight plan to avoid RF signal interference and/or damage to the UAV based on the collected RF signal data. In some implementations, the UAV can collect RF signal data and generate a three-dimensional received signal strength map that describes the received signal strength at various locations within a volumetric area around the RF transmitter. In some implementations, the UAV can collect RF signal data and determine whether a RF signal transmitter is properly aligned.

A method for transmitting a power headroom, a terminal device, and a network device are provided. The method includes: sending a power headroom PH value of a serving cell to a network device, where the PH value is a first PH value of a first sounding reference signal SRS and/or a second PH value of a second SRS; and the first PH value is obtained based on first configuration information of the first SRS, the first SRS is an SRS used for positioning, and the second SRS is an SRS used for measurement.

A moving robot has a body and at least one wheel for moving the main body. The moving robot has a transceiver to communicate with a plurality of location information transmitters located within an area. The moving robot also has a memory storing coordinate information regarding positions of the location information transmitters. Further, the moving robot has a controller that sets a virtual boundary based on location information determined using signals transmitted by the location information transmitters. The controller controls the wheel so that the main body is prevented from traveling outside the virtual boundary. The controller sets a reference location information transmitter and corrects the stored coordinate information by correcting height errors based on height differences between the reference location information transmitter and the other location information transmitters. The controller also corrects a current position of the main body based on the corrected stored coordinate information.

A communications system, including at least one tag and a plurality of beacons. The tags are configured to detect beacon advertisement messages, initiate a connection with at least one of the plurality of and transmit a Constant Tone (CT) to the at least one of the plurality of beacons. The tag is further configured to determine a location thereof based on the sampled CT from both the beacon and the tag and then report the location via the one of the beacons and/or an access point. Phase ranging mitigation techniques which include hop duplication, hop interpolation and ADC DC offset correction are employed so as to provide more accurate ranging values even in the case where there are many other devices in local proximity and which are competing for use of the same RF channels as those used by the tags and beacons.

Methods and apparatus are provided for improving the resilience of a network of positioning-unit devices to failure of the reference device that controls the network timebase via timing information in its signal. In certain embodiments a predetermined one of the positioning-unit devices is configured to monitor the reference signal, assess serviceability of that signal and take control of the network if it determines that signal is unserviceable. Continuity of network synchronisation is thereby maintained despite the reference signal being unserviceable. Preferably the predetermined positioning-unit device is configured to obtain information on the reference signal from at least one other positioning-unit device for assessing reference signal serviceability. If the reference device recovers from a failure it can re-enter the network by synchronising its signal to a signal from one of the positioning-unit devices, and may then negotiate with the predetermined positioning-unit device to resume control of the network.

A system for assisting the positioning, in particular the orientation, with regard to a target position, of an antenna of a beacon intended to be in communication link by radio signal with a transmitter/receiver device, the system including a system for representation of a lobe of the radiation pattern of the antenna of the beacon on a projection surface of an environment in which said beacon is intended to be installed, and a system for measuring a distance separating the beacon and at least one point on the projection surface corresponding to the target position or positions.

A method for estimating a time of arrival of a signal transmitted over a wireless channel, includes receiving the signal by a receiving device; correlating the received signal with a filtered code sequence to create a correlation output, identifying in the correlation output, an observation window associated with a main lobe in the correlation output; and processing the observation window to determine a time of arrival of a first path component in the received signal. The filtered code sequence is formed by incorporating a time of arrival matched filter (TOA-MF) inside predetermined shaped code sequence. The TOA-MF is matched to the predetermined shaped code sequence and is based upon a power delay profile of the wireless channel. The predetermined shaped code sequence is a convolution of a predetermined shaping sequence and a predetermined code sequence.

In an embodiment a method includes emitting at least one group of at least N+1 mutually temporally asynchronous synchronization signals from at least N+1 fixed emitting locations in a space, receiving the synchronization signals of the group by a mobile device and at at least one fixed receiving location in the space, determining a reception moment of each synchronization signal of the at least one group by the mobile device in a time base specific to the mobile device, determining a reception moment of the synchronization signals of the at least one group at the at least one receiving location in a time base specific to each receiving location, and determining a position of the mobile device in the space at a given moment based on the reception moments determined at the at least one receiving location, the reception moments determined by the mobile device, coordinates of the emitting locations in the space and a distance between each emitting location and the at least one receiving location.

Localization systems and methods for transmitting timestampable localization signals from anchors according to one or more transmission schedules. The transmission schedules may be generated and updated to achieve desired positioning performance. For example, one or more anchors may transmit localization signals at a different rate than other anchors, the anchor transmission order can be changed, and the signals can partially overlap. In addition, different transmission parameters may be used to transmit two localization signals at the same time without interference. A self-localizing apparatus is able to receive the localization signals and determine its position. The self-localizing apparatus may have a configurable receiver that can select to receive one of multiple available localization signals. The self-localizing apparatuses may have a pair of receivers able to receive two localization signals at the same time. A bridge anchor may be provided to enable a self-localizing apparatus to seamlessly transition between two localization systems.