A method and system for enabling the determination of a position of a receiver within a space includes transmitting a beacon signal from each of a plurality of beacon devices located at different locations within the space. The beacon signal transmitted from each beacon device has a unique information component and may have a unique frequency pattern of multiple frequencies. Each beacon signal can be distinguishable from the beacon signals transmitted from any other of the beacon devices based on the combination of its unique information component and its unique frequency pattern. The beacon signals are received at a receiver. At the receiver, for each beacon signal of a working subset, time-delay information of the received beacon signal is determined and multilateration is applied to determine the position of the receiver based on the location of each beacon device of the working subset.

A method and system for enabling the determination of a position of a receiver within a space includes transmitting a beacon signal from each of a plurality of beacon devices located at different locations within the space. The beacon signal transmitted from each beacon device has a unique information component and may have a unique frequency pattern of multiple frequencies. Each beacon signal can be distinguishable from the beacon signals transmitted from any other of the beacon devices based on the combination of its unique information component and its unique frequency pattern. The beacon signals are received at a receiver. At the receiver, for each beacon signal of a working subset, time-delay information of the received beacon signal is determined and multilateration is applied to determine the position of the receiver based on the location of each beacon device of the working subset.

Provided are systems and methods for reversing the conventional roles of central and peripheral devices in a BLE network. Doing so includes implementing an end node (EN) as the sole initiator of a connection between a particular EN and a particular access point (AP). Such implementation includes determining a location of the EN, in which that location is resolved by the EN and defined with respect to exchanges of Constant Tone Extensions (CTEs) between the EN and reference points (RPs).

The purpose of the present invention is to reduce the introduction cost of an indoor positioning system using inaudible sound. A positioning system according to one embodiment includes a first acquisition unit, a second acquisition unit, and a positioning unit. The first acquisition unit acquires a reception log indicating that a fixed receiver receives signal source-specific inaudible sounds from multiple signal sources. The second acquisition unit acquires, from a storage unit, signal source information on multiple signal sources corresponding to a fixed receiver installed near a mobile terminal. Here, the signal source information contains information for identifying a signal source from inaudible sound, the transmission timing of inaudible sound at the signal source, and the location of the signal source.

The purpose of the present invention is to reduce the introduction cost of an indoor positioning system using inaudible sound. A positioning system according to one embodiment includes a first acquisition unit, a second acquisition unit, and a positioning unit. The first acquisition unit acquires a reception log indicating that a fixed receiver receives signal source-specific inaudible sounds from multiple signal sources. The second acquisition unit acquires, from a storage unit, signal source information on multiple signal sources corresponding to a fixed receiver installed near a mobile terminal. Here, the signal source information contains information for identifying a signal source from inaudible sound, the transmission timing of inaudible sound at the signal source, and the location of the signal source.

A luminous intensity compensator, comprising a light source; a sensor, configured to receive sensor information representing a position of the light source, and to output sensor data representing the position of the light source; one or more processors, configured to determine from the sensor data a distance between the light source and a reference point; determine a loss factor of a wavelength based on the determined distance between the light source and the reference point; determine a compensated luminous intensity to yield a target luminous intensity of the wavelength after luminous intensity reduction due to the loss factor; and output control data to control the light source to emit the wavelength at the compensated luminous intensity.

A luminous intensity compensator, comprising a light source; a sensor, configured to receive sensor information representing a position of the light source, and to output sensor data representing the position of the light source; one or more processors, configured to determine from the sensor data a distance between the light source and a reference point; determine a loss factor of a wavelength based on the determined distance between the light source and the reference point; determine a compensated luminous intensity to yield a target luminous intensity of the wavelength after luminous intensity reduction due to the loss factor; and output control data to control the light source to emit the wavelength at the compensated luminous intensity.

A bed proximity-determining system includes communications functionality and an ability to determine the proximity of a caregiver to a bed. Based on that proximity, the system transmits commands to the bed or a local system.

Systems, apparatuses and methods are provided herein for monitoring stock information in a shopping space. A system for monitoring stock information in a shopping space comprises: a support structure configured to hold a plurality of items in the shopping space, a sound emitter device configured to produce a sound in response to a movement of at least one of the support structure and an item placed on the support structure, and a sound sensor configured to capture a sound produced by the sound emitter device and transmit the sound produced by the sound emitter device to a stock tracking system.

A tracking method includes displaying visual content on a screen of a head mounted display (HMD). One or more base stations may be stationary with respect to the screen while the visual content is being displayed. In contrast, one or more objects may move with respect to the screen while the visual content is being displayed. Time-difference-of-arrival (TDoA) and/or time-of-flight (ToF) may be measured for one or more ultrasonic pulses transmitted from the base station, one or more objects, or HMD. Position and orientation of the objects and HMD may be calculated based on the TDoA and ToF. Different frequencies of pulses may be used to locate the HMD and the objects. An electromagnetic synchronization signal from the HMD and/or base station may be used to measure TDoA. Position and orientation measurements may be fused with outputs from IMUS (inertial measurement units) to reduce jitter.