Disclosed is a security system configured to provide an extra layer of security for any given premises. The system includes a monitoring device worn by a person of interest, usually a criminal out on parole. The system also includes a plurality of proximity sensors that detect the presence of signals emitted by the monitoring device. When detected, the proximity sensors relay identifying information from the monitoring device to a security panel. The security panel then alerts local law enforcement to the potential threat so they may respond accordingly. The present disclosure also includes a method of altering law enforcement with particular identifying data of an intruder. Lastly, the system to may be used to create a secure, wireless tether to track the safety and location of a dependent (e.g., a child, pet, or livestock).

Systems and methods for navigating an aerial vehicle are provided. One example aspect of the present disclosure is directed to a method for navigating an aircraft. The method includes receiving, by one or more processors, one or more first geographic coordinates via an interface configured to receive geographic coordinates from a satellite transmission. The method includes receiving, by the one or more processors, one or more second geographic coordinates via an interface configured to receive geographic coordinates from a ground transmission. The method includes determining, by the one or more processors, that the one or more first geographic coordinates and the one or more second geographic coordinates are inconsistent. The method includes updating, by the one or more processors, a flight plan using the one or more second geographic coordinates when the one or more first geographic coordinates are inconsistent with the one or more second geographic coordinates.

A terrestrial positioning and timing system (TPTS) comprising a ground segment and user segment is disclosed that is comprised of a spread-spectrum based range and bearing reference signal, with respect to a reference time, transmitted by an antenna over a broad region of space; and a spread-spectrum based bearing variable signal with bearing specific modulation referenced to a reference time, transmitted using a scanning antenna over a spatial region of space that is more narrow than the spread-spectrum based range and bearing reference signal transmission spatial area. Various embodiments enable the TPTS station and user to support various position, velocity or time services. Most notably, an embodiment with a single TPTS station, active interrogation/transponder reply, and data delivery subsystem can provide a position, velocity, and time solution for the user. Additional embodiments disclosed provide varying levels of user solutions to include bearing, position, velocity, or time.

Disclosed embodiments pertain to a method of generating a Positioning Reference Signal (PRS) sequence for a system comprising a plurality of physical transmitting antenna elements serving a single cell. In some embodiments, the method may comprise: assigning a distinct Physical Antenna Port (PAP) identifier (ID) to a subset of the plurality of physical transmitting antenna elements; and generating PRS sequences for the subset of the plurality of physical transmitting antenna elements, wherein each PRS sequence corresponds to a physical transmitting antenna element in the subset of the plurality of physical transmitting antenna elements, and each PRS sequence has a corresponding frequency shift based, at least in part, on the PAP ID (h) of the corresponding physical transmitting antenna element.

A system and method for determining the presence of an individual at a particular spot within a location preferably based on the strength of signals received from beacons assigned to the particular spot by a software application (App) running on an electronic device of the individual. In one embodiment, certain presence calculations are performed by the App. In another embodiment, the App forwards information regarding the received beacon signals to an electronic identification and location tracking system and the presence calculations are performed by the system.

Systems and methods for identifying device location are provided. The method can include providing, by a mobile computing device, at least a first ultrasonic signal to a first and a second self-organizing beacon device. The method can include receiving, by the mobile computing device, a first radio frequency signal including the location of the first beacon device and a second radio frequency signal including the location of the second beacon device. The method can further include determining a first time-of-flight associated with the first beacon device and a second time-of-flight associated with the second beacon device. The method can include determining a location of the mobile computing device based at least in part on the first time-of-flight, the second time-of-flight, the location of the first beacon device, and the location of the second beacon device.

Installation of a Bluetooth and/or Wi-Fi enabled RF beacon within a vehicle. The RF beacon can be utilized to direct a user to a parking space where the user parked the vehicle. The return to parking feature can provide navigation from a current location of the user to the vehicle parking space. Navigation can be accomplished using a Global Positioning System (GPS), a beacon navigation system, or a combination thereof. The RF beacon can be utilized as a geofence. The geofence can provide several functions, such as a reminder to collect one or more items from the vehicle when the user travels outside of the geofence; automatically register the parking space where the vehicle is parked; automatically initiate a Location Based Service, and the like.

Installation of a Bluetooth and/or Wi-Fi enabled RF beacon within a vehicle. The RF beacon can be utilized to direct a user to a parking space where the user parked the vehicle. The return to parking feature can provide navigation from a current location of the user to the vehicle parking space. Navigation can be accomplished using a Global Positioning System (GPS), a beacon navigation system, or a combination thereof. The RF beacon can be utilized as a geofence. The geofence can provide several functions, such as a reminder to collect one or more items from the vehicle when the user travels outside of the geofence; automatically register the parking space where the vehicle is parked; automatically initiate a Location Based Service, and the like.

Disclosed embodiments pertain to a method of generating a Positioning Reference Signal (PRS) sequence for a system comprising a plurality of physical transmitting antenna elements serving a single cell. In some embodiments, the method may comprise: assigning a distinct Physical Antenna Port (PAP) identifier (ID) to a subset of the plurality of physical transmitting antenna elements; and generating PRS sequences for the subset of the plurality of physical transmitting antenna elements, wherein each PRS sequence corresponds to a physical transmitting antenna element in the subset of the plurality of physical transmitting antenna elements, and each PRS sequence has a corresponding frequency shift based, at least in part, on the PAP ID (h) of the corresponding physical transmitting antenna element.

Methods and compositions for preventing opposing ILS systems on a single runway from becoming active at the same time. A physical interlock system employs a physical switch element that may activate a first ILS system or an opposing second ILS system, but is not capable of permitting, and may prevent, opposing ILS systems from being active simultaneously. Also included are methods for preventing opposing ILS systems on a single runway from becoming active, comprising the use of a physical switch preventing activating signals from being sent to opposing ILS systems at the same time.