Abstract: In a visual light communication (VLC) or other light based positioning system, a mobile device can detect modulated light emitted by one or more localized artificial lighting devices to obtain an identification (ID) label or code of each lighting device, e.g. that is visible in an image captured by the mobile device camera. The mobile device uses the detected ID code for a lookup in a self-stored or remotely stored table that associates light-source-location information with ID codes, to obtain an estimate of mobile device position. To mitigate against hacking by a third party detecting the ID codes and observing locations to compile its own lookup table, the disclosed examples dynamically alter the assignments of particular ID codes to the lighting devices, while minimizing potential disruption of position determination service for mobile devices due to the changes to ID code assignments.

Abstract: A light source emits a modulated light, and a radio-frequency transceiver disposed therewith emits a radio-frequency signal. A mobile device may receive either or both signals and determine its position based thereon. The light and radio-frequency sources may be disposed in node in a network of said sources, and the nodes may communicate via the radio-frequency transceivers.

Abstract: A lighting network includes a plurality of nodes, each having a node identifier. Each node includes a light source and a radio-frequency (RF) transceiver that transmits RF signals to and receives RF signals from other ones of the nodes. Each signal includes a data packet having a packet identifier, a destination node identifier and a payload. Each node compares the packet identifier of a received packet to a list of packets identifiers and when the packet identifier is not in the list, adds the packet identifier to the list. If the node is the destination node for the packet, the node then executes a command contained in the payload of the packet. If the node is not the destination node, the node retransmits the packet to the nodes that are within range of the RF transceiver. When the packet is in the list, the node discards the packet.

Abstract: In a visual light communication (VLC) or other light based positioning system, a mobile device can detect modulated light emitted by one or more localized artificial lighting devices to obtain an identification (ID) label or code of each lighting device, e.g. that is visible in an image captured by the mobile device camera. The mobile device uses the detected ID code for a lookup in a self-stored or remotely stored table that associates light-source-location information with ID codes, to obtain an estimate of mobile device position. To mitigate against hacking by a third party detecting the ID codes and observing locations to compile its own lookup table, the disclosed examples dynamically alter the assignments of particular ID codes to the lighting devices, while minimizing potential disruption of position determination service for mobile devices due to the changes to ID code assignments.

Abstract: In a visual light communication (VLC) or other light based positioning system, a mobile device can detect modulated light emitted by one or more localized artificial lighting devices to obtain an identification (ID) label or code of each lighting device, e.g. that is visible in an image captured by the mobile device camera. The mobile device uses the detected ID code for a lookup in a self-stored or remotely stored table that associates light-source-location information with ID codes, to obtain an estimate of mobile device position. To mitigate against hacking by a third party detecting the ID codes and observing locations to compile its own lookup table, the disclosed examples dynamically alter the assignments of particular ID codes to the lighting devices, while minimizing potential disruption of position determination service for mobile devices due to the changes to ID code assignments.

Abstract: An example of a lighting device including a light source, a modulator and a processor. The processor is configured to control the light source to emit light for general illumination and control the modulator to modulate the intensity of the emitted light to superimpose at least two sinusoids. Frequencies of the at least two sinusoids enable a mobile device to infer the physical location of the lighting device.

Abstract: A light source emits a modulated light, and a radio-frequency transceiver disposed therewith emits a radio-frequency signal. A mobile device may receive either or both signals and determine its position based thereon. The light and radio-frequency sources may be disposed in node in a network of said sources, and the nodes may communicate via the radio-frequency transceivers.

Abstract: A light source emits a modulated light, and a radio-frequency transceiver disposed therewith emits a radio-frequency signal. A mobile device may receive either or both signals and determine its position based thereon. The light and radio-frequency sources may be disposed in node in a network of said sources, and the nodes may communicate via the radio-frequency transceivers.

Abstract: A light source emits a modulated light, and a radio-frequency transceiver disposed therewith emits a radio-frequency signal. A mobile device may receive either or both signals and determine its position based thereon. The light and radio-frequency sources may be disposed in node in a network of said sources, and the nodes may communicate via the radio-frequency transceivers.

Abstract: A lighting network includes a plurality of nodes, each having a node identifier. Each node includes a light source and a radio-frequency (RF) transceiver that transmits RF signals to and receives RF signals from other ones of the nodes. Each signal includes a data packet having a packet identifier, a destination node identifier and a payload. Each node compares the packet identifier of a received packet to a list of packets identifiers and when the packet identifier is not in the list, adds the packet identifier to the list. If the node is the destination node for the packet, the node then executes a command contained in the payload of the packet. If the node is not the destination node, the node retransmits the packet to the nodes that are within range of the RF transceiver. When the packet is in the list, the node discards the packet.

Abstract: An example of a technique for compensating for effects of Earth's magnetic field variations on a mobile device positioning system. A mobile device utilizes a compass to obtain an absolute heading when located relative to a visible light source. The mobile device obtains a heading correction value based on an identifier of the visible light source. An orientation of a map displayed on the mobile device is rotated based on the absolute heading and the heading correction value in order to provide an indication of a location of the mobile device properly oriented on the map.

Abstract: An example of a technique for maintaining a previously calibrated mobile device positioning system to account for changes in perturbers of the Earth's magnetic field. A mobile device obtains a corrected heading estimate of the mobile device within a space based on a previously recorded heading correction value. The mobile device also calculates a device heading relative to a previously orientated map of the space. The mobile device subsequently updates the heading correction value with any deviation between the corrected heading estimate and the calculated device heading.

Abstract: An example of a system including a plurality of lighting devices, each lighting device including a light source, a modulator and a processor. Each processor is configured to control the respective light source to emit light for general illumination and control the respective modulator to modulate the intensity of the emitted light to broadcast a respective signal modulated on the emitted light within a respective range of frequencies. A first lighting device and a second lighting device modulate emitted light within the same range of frequencies when the first lighting device is set at a distance from the second lighting device such that modulated light emitted by the first lighting device appears in a first portion of an image sensor of a mobile device and modulated light emitted by the second lighting device appears in a second portion of the image sensor separate from the first portion.

Abstract: An example of a lighting device including a light source, a modulator and a processor. The processor is configured to control the light source to emit light for general illumination and control the modulator to modulate the intensity of the emitted light to superimpose at least two sinusoids. Frequencies of the at least two sinusoids enable a mobile device to infer the physical location of the lighting device.

Abstract: An example of a lighting device including a light source, a modulator and a processor. The processor is configured to control the light source to emit light for general illumination and control the modulator to modulate the intensity of the emitted light to superimpose at least two sinusoids. Frequencies of the at least two sinusoids enable a mobile device to infer the physical location of the lighting device.

Abstract: An example of a lighting device including a light source, a modulator and a processor. The processor is configured to control the light source to emit light for general illumination and control the modulator to modulate the intensity of the emitted light to superimpose at least two sinusoids. Frequencies of the at least two sinusoids enable a mobile device to infer the physical location of the lighting device.

Abstract: An example of a lighting device including a light source, a modulator and a processor. The processor is configured to control the light source to emit light for general illumination and control the modulator to modulate the intensity of the emitted light to superimpose at least two sinusoids. Frequencies of the at least two sinusoids enable a mobile device to infer the physical location of the lighting device.

Abstract: An example of a lighting device including a light source, a modulator and a processor. The processor is configured to control the light source to emit light for general illumination and control the modulator to modulate the intensity of the emitted light to superimpose at least two sinusoids. Frequencies of the at least two sinusoids enable a mobile device to infer the physical location of the lighting device.

Abstract: A light source emits a modulated light, and a radio-frequency transceiver disposed therewith emits a radio-frequency signal. A mobile device may receive either or both signals and determine its position based thereon. The light and radio-frequency sources may be disposed in node in a network of said sources, and the nodes may communicate via the radio-frequency transceivers.