Aircraft interior wireless communications system
A wireless communications system suitable for use within an aircraft, such as a part of a wireless emergency lighting system (WELS) is provided. In an aircraft, EXIT signs are located throughout the interior of the aircraft, including the ceiling (general illumination), seats (floor proximity) and EXIT doors (locator/identifier). A wireless communications system uses an integrated lens antenna system that takes advantage of the quantity and location of emergency lights such that any given light will have a direct radio frequency (RF) path to several other lights. A virtual network can be created such that if the path between any two lights becomes disrupted, alternate paths will be constructed under software control.
1. A wireless emergency lighting system (WELS) for an aircraft interior, the system comprising:
a plurality of light assemblies locatable throughout the aircraft interior, each of the plurality of light assemblies including at least one wireless communication device; and
a WELS controller for communicating wirelessly with one or more of the plurality of light assemblies,
wherein each light assembly is in wireless communication with one or more other light assemblies via its at least one wireless communication device, and
wherein the WELS controller communicates with a given light assembly along a given wireless communications path, and the WELS controller changes the wireless communications path between the controller and the given light assembly in response to a disruption of communication path between two light assemblies along the given wireless communications path.
2. The WELS of claim 1 , wherein the at least one wireless communication device includes a radio frequency (RF) antenna.
3. The WELS of claim 2 , wherein each light assembly includes a housing;
one or more light generating elements mounted to the housing;
a lens mounted on the front of the housing; and
a radio frequency (RF) antenna disposed on or in the lens.
4. The WELS of claim 3 , wherein the lens is comprised of a dielectric material and includes a front surface and a rear surface, the rear surface including a substantially translucent conductive coating and the front surface including a substantially translucent conductive antenna pattern.
5. The WELS of claim 3 , wherein the lens includes a plurality of antennae on or in the lens.
6. The WELS of claim 5 , wherein each of the plurality of antennae has a different directivity and/or polarization.
7. The WELS of claim 6 , wherein each light assembly is switchable between any of the plurality of antennae.
8. The WELS of claim 6 , wherein each light assembly is switchable between any of the plurality of antennae to optimize received signal strength.
9. The WELS of claim 1 , wherein the WELS controller is in data communication with a cabin services communications system (CSCS).
10. The WELS of claim 1 , wherein each light assembly includes a light assembly controller in wireless data communication with the WELS controller directly or through one or more other light assembly.
11. The WELS of claim 1 , wherein the plurality of light assemblies are interior emergency lights.
12. A lighting device comprising:
a housing;
one or more light generating elements mounted to the housing;
a wireless communication device mounted to the housing, and
a lens mounted on the front of the housing, the lens including a radio frequency (RF) antenna disposed integrally with the lens, the lighting device being located within the interior of an aircraft, wherein the lens is comprised of a dielectric material and includes a front surface and a rear surface, the rear surface including a substantially translucent electrical conducting coating and the front surface including a substantially translucent conductive antenna pattern.
13. The device of claim 12 , wherein the substantially translucent conductive coating is indium-tin-oxide (ITO).
14. The device of claim 12 , wherein the lens further includes a transmission line in data communication with the RF antenna.
15. The device of claim 12 , wherein the lens includes a plurality of antennae on or in the lens.
16. The device of claim 15 , wherein each of the plurality of antennae has a different directivity and/or polarization.
17. The device of claim 15 , wherein the lens includes a pair of antennae operable at different modulation frequencies.
18. The device of claim 15 , wherein the lens includes an antenna operable at difference modulation frequencies.
19. The device of claim 12 , wherein the lens is an EXIT sign lens.
20. The device of claim 12 , wherein the light generating elements are light emitting diodes (LEDs).
21. A wireless communications system for an aircraft interior, the system comprising:
a plurality of devices locatable throughout the aircraft interior, each of the plurality of devices including at least one wireless communication device;
a controller in wireless communication with one or more of the plurality of devices;
wherein the controller communicates with a given device along a given wireless communications path, and the controller changes the wireless communications path between the controller and the given device in response to a disruption of communication path between two devices along the given wireless communications path.