Techniques for emitting position information from luminaires
Techniques are disclosed for emitting position information from luminaires. Luminaire position information may be emitted via a light-based communication (LCom) signal that comprises data including the position information. The data may include relative and/or absolute position information for the luminaire and may indicate the physical location of the luminaire. Relative position information for the luminaire may include coordinates relative to a point of origin within the environment. Absolute position information for the luminaire may include global coordinates for the luminaire. In some cases, the absolute position information for a luminaire may be calculated using position information for the luminaire relative to a point of origin and the absolute position of the point of origin. The data may also include an environment identifier, which may indicate a map to use for the interpretation of position information for the luminaire. The techniques can be used for both stationary and mobile luminaires.
1. A luminaire comprising:
at least one solid-state light source having a light output;
at least one modulator configured to modulate the light output of the at least one light source to emit a light-based communication (LCom) signal, wherein the LCom signal is configurable to contain data, wherein the data includes at least position information indicating the physical location of the at least one light source, wherein the at least one light source is configured to illuminate at least part of a given environment and the position information indicates both relative and absolute position information for the at least one light source, the relative position indicating position of the at least one light source relative to another location within the environment, and the absolute position indicating a global position of the at least one light source; and
one or more sensors coupled to the at least one solid-state light source and the at least one modulator and configured to dynamically update the position information based on real-time changes to the physical location of the at least one light source.
2. The luminaire of claim 1 , wherein the data includes an environment identifier that indicates one or more maps to be used for the position information.
3. The luminaire of claim 2 , wherein the data includes position information relative to a physical location within the environment, and the physical location is identified by at least one of the environment identifier and the data.
4. The luminaire of claim 1 , further comprising at least one of:
on-board memory that stores at least one of the data and position information; and
a communication module configured to receive at least one of the data and position information.
5. The luminaire of claim 1 , wherein the position information includes global coordinates for the at least one light source.
6. The luminaire of claim 1 , wherein the position information is programmable.
7. The luminaire of claim 1 , wherein the light output emitted by the at least one light source and modulated by the modulator to provide the LCom signal is visible light.
8. A system comprising the luminaire of claim 1 and further comprising at least one mobile computing device configured to receive and interpret the LCom signal.
9. A light-based communication (LCom) method comprising:
emitting, by at least one solid-state light source in a luminaire, a light output;
modulating the light output of the at least one light source to emit an LCom signal, wherein the LCom signal is configurable to contain data, wherein the data includes at least position information indicating the physical location of the at least one light source, wherein the at least one light source is configured to illuminate at least part of a given environment and the position information indicates both relative and absolute position information for the at least one light source, the relative position indicating position of the at least one light source relative to another location within the environment, and the absolute position indicating a global position of the at least one light source; and
dynamically updating, by one or more sensors in the luminaire, the position information based on real-time changes to the physical location of the at least one light source.
10. The method of claim 9 , wherein the data includes an environment identifier that indicates one or more maps to be used for the position information.
11. The method of claim 10 , wherein the data includes position information relative to a physical location within the environment, and the physical location is identified by at least one of the environment identifier and the data.
12. The method of claim 9 , wherein the position information includes global coordinates for the at least one light source.
13. The method of claim 9 , wherein the position information is programmable.
14. The method of claim 9 , wherein the light output emitted by the at least one light source is visible light.
15. A non-transitory computer program product encoded with instructions that, when executed by one or more processors, causes a process to be carried out, the process comprising:
modulating light output of at least one light source in a luminaire to emit a light-based communication (LCom) signal, wherein:
the LCom signal is configurable to contain data, the data including at least position information indicating the physical location of the at least one light source, and
the at least one light source is configured to illuminate at least part of a given environment and the position information indicates both relative and absolute position information for the at least one light source, the relative position indicating position of the at least one light source relative to another location within the environment, and the absolute position indicating a global position of the at least one light source; and
dynamically updating the position information based on real-time changes to the physical location of the at least one light source, wherein updated position information is collected from one or more sensors in the luminaire.
16. The computer program product of claim 15 , wherein the data includes an environment identifier that indicates one or more maps to be used for the position information.