An eLORAN receiver may include an antenna and eLORAN receiver circuitry coupled to the antenna. The antenna may include a ferromagnetic core and an H-field signal winding coupled to the ferromagnetic core. The eLORAN receiver may have an antenna tuning device including a tuning winding surrounding the ferromagnetic core, and a tuning circuit coupled to the tuning winding.

Aircraft tracking and emergency location avionics architectures that integrate existing fixed Emergency Locator Transmitter (ELT) installations, their associated aircraft avionics systems and existing flight deck interfaces with an Autonomous Distress Tracker (ADT) transceiver unit in a coupled configuration. Some of the architectures allow the ADT unit and its advanced distress detecting and reporting capabilities to monitor the activation control path for the ELT and the associated ELT activation outputs. Other architectures place the ADT unit and its advanced distress detection capabilities and ground-controlled capabilities in the activation control path for the ELT. Additional architectures entail the connection of an ADT unit to an ELT remote panel on the flight deck of an aircraft.

A method, system, and computer-readable medium for reducing multipath propagation of a navigational aid station. Aspects include modulating an oscillator of the navigational aid station. Aspects also include transmitting a first signal using one or more antennas of the navigational aid station. Aspects additionally include transmitting a second signal using the one or more antennas of the navigational aid station. For example, the oscillator may be used as a frequency source for the first signal and the second signal.

A beacon device is provided in proximity to a computing system within a computing center. A request to locate the computing system in the computing center is triggered on a central control unit. In response to the request to locate the computing system, the control unit generates specification data for a unique radio signal identifier, sends an activation request and the specification data to the beacon device, and provides the specification data to a portable device and stores the specification data on the portable device.

A beacon device is provided in proximity to a computing system within a computing center. A request to locate the computing system in the computing center is triggered on a central control unit. In response to the request to locate the computing system, the control unit generates specification data for a unique radio signal identifier, sends an activation request and the specification data to the beacon device, and provides the specification data to a portable device and stores the specification data on the portable device.

A management system for objects under monitoring that is capable of managing the presence of moving objects under monitoring. The management system includes a plurality of beacon terminals, one or more management terminals, and a management server. The beacon terminals are respectively held by the moving objects under monitoring, and each have a unique identifier and broadcast a beacon signal. The one or more management terminals are respectively held by one or more moving bodies moving in one or more areas, receive beacon signals to acquire beacon identifiers and beacon presence information, and acquire location information via a positioning system. The management terminals output beacon information spontaneously or upon request. The management server determines the state of presence of the objects under monitoring in the one or more areas, based on the beacon information acquired from the one or more management terminals.

A lighting apparatus that is used in a positioning system and is locatable in plural number in a limited area is provided. The lighting apparatus for use in the positioning includes a power supplier that supplies power, a lighting unit that is lit by the power supplied by the power supplier, and a beacon transmitter. The beacon transmitter operates by the power supplied by the power supplier, and transmits a beacon that is a signal for positioning. The beacon includes a long-distance beacon transmitted with first transmission power and a short-distance beacon transmitted with a second transmission power less than the first transmission power. The beacon transmitter transmits at least the long-distance beacon intermittently.

A user enters a location with a user device. A beacon device broadcasts a first beacon device code comprising a hardware identifier via a local wireless network at the location. A service application of the user device receives the first beacon device hardware identifier, logs a check-in status of the user, and transmits the check-in status to a service provider system. The beacon device generates, after a predetermined period of time, a subsequent beacon device code comprising a random number to broadcast at the location via the local wireless network. In response to receiving the subsequent beacon device code broadcast by the beacon device, the user device logs and transmits a subsequent check in status to the service provider system via the network. The service provider system provides services to the user device or another device at the location in accordance with the check-in status of the user device.

A user enters a location with a user device. A beacon device broadcasts a first beacon device code comprising a hardware identifier via a local wireless network at the location. A service application of the user device receives the first beacon device hardware identifier, logs a check-in status of the user, and transmits the check-in status to a service provider system. The beacon device generates, after a predetermined period of time, a subsequent beacon device code comprising a random number to broadcast at the location via the local wireless network. In response to receiving the subsequent beacon device code broadcast by the beacon device, the user device logs and transmits a subsequent check in status to the service provider system via the network. The service provider system provides services to the user device or another device at the location in accordance with the check-in status of the user device.

An earth positioning system (EPS) is provided. The EPS includes a plurality of fixed LED lights with communication functions and a mobile communications device. A cloud computer and at least one map marked with world coordinates of the fixed LED lights may be further included. The LED light includes a substrate, at least one LED die, a power supply, a wireless communication module, a control unit and a housing. The LED lights may be arranged in indoor and outdoor environments, with coordinates represented in longitude, latitude and altitude. The coordinates are included in a map data of the cloud computer. When the mobile communication device moves with its carrier, the world coordinates of the mobile communication device can be located based on the coordinates of the LED lights nearby or based on the unique IDs of the LED lights together with the aforementioned map.