Systems and methods enabling location determination within an indoor environment. In an embodiment, a plurality of stationary nodes are arranged as a constellation within the indoor environment. Each of the plurality of stationary nodes may be configured to transmit a ranging signal, receive ranging signals transmitted by one or more neighboring ones of the plurality of stationary nodes, calculate an offset between the ranging signal that the stationary node transmits and the ranging signals received from the one or more neighboring stationary nodes, and include the offset in the ranging signal that the stationary node transmits.

A system for monitoring a presence of an object in a volume of space can include a controller and a first electrical device coupled to the controller, where the first electrical device is disposed in the volume of space and includes a first receiver, where the first receiver has a first communication range. The system can also include an object having a beacon having an object communication range, where the beacon sends multiple signals that are received by the first receiver when the object communication range overlaps with the first communication range, where each signal includes an identification of the object. The controller can determine a first point in time when none of the signals is received, where the controller determines at the first point in time that the object is removed from a first location defined by the first communication range.

The disclosure provides examples of systems and methods for determining locations of a number of radio frequency-enabled devices such as mobile devices and radio frequency-equipped beacons/luminaires within an indoor location. The radio frequency-enabled devices may be part of an indoor positioning system and/or content delivery system. The examples describe obtaining an angle of arrival (AoA) of the signals received by the respective radio frequency-enabled devices. The AOA data is used to identify the relative positions of the radio frequency-enabled devices as the mobile device moves about the indoor location. Upon comparing AOA measurements of the collected data related to a map of the location, the system may generate a data structure that may be presented graphically as a map of positions of the devices at the location. The described examples may enable a rapid commissioning process with respect to the radio frequency-enabled devices in a network.

A method of operating an indoor location services system includes providing a calibration beacon signal from a calibration device at a number of calibration locations, measuring a received signal strength of the calibration beacon signal at each one of a number of receivers for each one of the number of calibration locations, measuring a received signal strength of a beacon signal provided by a locatable device at each one of the receivers, and estimating a location of the locatable device based on the received signal strength of the beacon signal at each one of the receivers, the received signal strength of the calibration beacon signal at each one of the receivers for each one of the calibration locations, and a location of each one of the receivers.

Beacon systems include a beacon including a transmitter, a processor, and a sensor for collecting sensor data, wherein the beacon broadcasts a beacon message comprising informational data based on a value of the sensor data and data regarding a minimum received signal strength for the relevance of the beacon message. The beacon system may include a receiving device, wherein the receiving device comprises a processor and an alarm adapted to be triggered by the beacon message, wherein the processor determines a relevance of the beacon message by comparing the minimum received signal strength for the relevance of the beacon message to an actual received signal strength of the beacon message, wherein, if the actual received signal strength is greater than or equal to the minimum received signal strength, the receiving device is within a range of relevance and the alarm is triggered.

A system for creating of list of active beacons includes at least one receiving device, comprising a receiver adapted to receive a beacon broadcast from one or more of a plurality of beacons, resulting in one or more received beacon broadcasts, a processor, a memory, and a smart beacon application. For each received beacon broadcast comprising informational data and data regarding a range of relevance for that beacon, the smart beacon application: 1) determines whether the beacon is relevant by comparing a strength of the received beacon broadcast to the range of relevance in the beacon broadcast, and 2) creates a list of relevant beacons.

Systems for muster include an entrance receiving device in a location adapted to receive a plurality of beacon broadcasts from one or more of a plurality of mobile beacons, each associated with a worker and broadcasting an identification ID of the worker, to create an on-site record of workers entering or exiting the location. The system includes a muster site receiving device at a muster site to record an identification ID from beacon broadcasts of workers at the muster site. The on-site record is compared to the recorded muster site IDs to determine if all workers have mustered. Alarms may be triggered if not.

A system for monitoring a presence of an object in a volume of space can include a controller and a first electrical device coupled to the controller, where the first electrical device is disposed in the volume of space and includes a first receiver, where the first receiver has a first communication range. The system can also include an object having a beacon having an object communication range, where the beacon sends multiple signals that are received by the first receiver when the object communication range overlaps with the first communication range, where each signal includes an identification of the object. The controller can determine a first point in time when none of the signals is received, where the controller determines at the first point in time that the object is removed from a first location defined by the first communication range.

A position alignment method, performed by a vehicle assembly (VA) including a reception pad receiving power transmitted from a transmission pad of a ground assembly (GA) is provided. The method includes transmitting a magnetic field using a transmitting device disposed on a reception pad, the transmitting device operating with low frequency (LF); receiving a magnetic field related value from the GA, the magnetic field being detected by an LF receiving device disposed on the transmission pad of the GA; and calculating, by a controller, a distance between the transmission pad and the reception pad using the magnetic field related value. A part of the transmitting device is disposed to arrange a magnetic field formed by the part of the transmitting device in a 0, 90, 180, or 270 direction with respect to a magnetic field formed by a part of the LF receiving device.

A method of operating an indoor location services system includes providing a calibration beacon signal from a calibration device at a number of calibration locations, measuring a received signal strength of the calibration beacon signal at each one of a number of receivers for each one of the number of calibration locations, measuring a received signal strength of a beacon signal provided by a locatable device at each one of the receivers, and estimating a location of the locatable device based on the received signal strength of the beacon signal at each one of the receivers, the received signal strength of the calibration beacon signal at each one of the receivers for each one of the calibration locations, and a location of each one of the receivers.