Disclosed are various approaches for determining positions of a navigation unit and correcting for errors. The navigation unit can receive a guided surface wave using a guided surface wave receive structure. The navigation unit can then determine a potential location of the guided surface wave receive structure. Finally, the navigation unit can determine an accuracy of the potential location based at least in part on a secondary data source.

The present disclosure relates to building management. Various embodiments may include methods for determining a current position of mobile objects in buildings including: transmitting a referenced item of position information to a mobile object; transmitting a building plan to the mobile object for display thereon; and providing a calibration calculation for determining the current position of the mobile object on the plans displayed on the mobile object based on the position information. The position information is unambiguously associated with the transmitting device and thus corresponds to a current location of the mobile object in the building. Transmission of the position information or of the reference thereto takes place within a directional radio emitting region.

Embodiments are directed to a system for implementing a restricted-operation region. The system includes an instruction development module configured to be utilized in the development of a set of instructions that implement an operation policy of the restricted-operation region. The set of instructions is configured to, when interpreted, implement the operation policy by controlling at least one function of a vehicle that attempts to operate within the restricted-operation region. The system further includes a first transmitter configured to transmit the set of instructions to the vehicle, wherein a processor of the vehicle is configured to interpret the set of instructions based at least in part on a determination that the vehicle is attempting to operate within the restricted-operation region.

Embodiments are directed to a system for implementing a restricted-operation region. The system includes an instruction development module configured to be utilized in the development of a set of instructions that implement an operation policy of the restricted-operation region. The set of instructions is configured to, when interpreted, implement the operation policy by controlling at least one function of a vehicle that attempts to operate within the restricted-operation region. The system further includes a first transmitter configured to transmit the set of instructions to the vehicle, wherein a processor of the vehicle is configured to interpret the set of instructions based at least in part on a determination that the vehicle is attempting to operate within the restricted-operation region.

Systems and methods for providing improved accuracy for beacon-based location systems. A location estimation system may include a multi-beacon system which includes two or more beacons positioned proximate each other. The beacons emit correlated beacon frames which are time and data correlated. A mobile device receives the beacon signals and processes them to estimate the distance between the mobile device and the multi-beacon system. The mobile device processes the signals based on a correlation function of the beacons signal strength trends, which indicates homogeneity and reliability of the acquired signals. When the correlation is high, the two or more RSSI signals are stable and may be used for the distance estimation. When the correlation is low, at least one of the signals is irregular. The mobile device compensates for the irregular signal, signal, thus improving distance estimation accuracy.

Described herein are embodiments of methods and apparatuses for an augmented reality positioning system wherein an augmented reality device may directly (or indirectly through a separate smart device) connect with a constellation of beacons with ultra-wideband (UWB) modules to estimate a position and overall attitude for the augmented reality device and modify the perceived position of a virtual elements in space accordingly. The embodiments may include configurations for how various devices may connect and send data between one another. The embodiments may further include various constellation arrangements for beacons as well as embodiments of methods of trilateration that may be used to interpret data from various beacons.

Described herein are embodiments of methods and apparatuses for an augmented reality positioning system wherein an augmented reality device may directly (or indirectly through a separate smart device) connect with a constellation of beacons with ultra-wideband (UWB) modules to estimate a position and overall attitude for the augmented reality device and modify the perceived position of a virtual elements in space accordingly. The embodiments may include configurations for how various devices may connect and send data between one another. The embodiments may further include various constellation arrangements for beacons as well as embodiments of methods of trilateration that may be used to interpret data from various beacons.

Conventional television audience measurements are made with diaries or by imaging the area in front of a television and trying to identify the people in the images watching television. Unfortunately, diaries are only accurate if the audience members record entries in them, and image-based techniques are intrusive. The present techniques address these problems by using a viewer's wearable device to measure a viewer's proximity to a television. The wearable device emits or receives low-power beacon signals; measurements of the signal strength are used to calculate the viewer's distance to the television. If the viewer is close enough to the television and the television is on, the viewer may be engaged with the content on the television. This system is simple, non-intrusive, and can used to measure engagement with each television in a multi-television household.

Conventional television audience measurements are made with diaries or by imaging the area in front of a television and trying to identify the people in the images watching television. Unfortunately, diaries are only accurate if the audience members record entries in them, and image-based techniques are intrusive. The present techniques address these problems by using a viewer's wearable device to measure a viewer's proximity to a television. The wearable device emits or receives low-power beacon signals; measurements of the signal strength are used to calculate the viewer's distance to the television. If the viewer is close enough to the television and the television is on, the viewer may be engaged with the content on the television. This system is simple, non-intrusive, and can used to measure engagement with each television in a multi-television household.

A UAV landing system can include a landing pad defining a landing area including a target point; a plurality of positioning radio transmitters positioned in a spaced apart relation and equidistant from the target point, each radio transmitter transmitting a ranging signal; and a position determination and aircraft navigation system at the incoming UAV to receive the ranging signals; determine a range to each positioning radio using the received ranging signals; compute a position of the UAV relative to the target point; determine a course for the UAV to a point above the target point of the landing pad; fly the UAV to the point above the target point of the landing pad, and cause the aircraft to descend vertically toward the target point when the UAV reaches the point above the target point.