Device and method for self-alighning position reference system

• US 20070095617A1
• Filed: 11/26/2003
• Published: 05/03/2007
• Est. Priority Date: 11/26/2003
• Status: Active Grant

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Finn, Alan
• Granted Patent: US 7,571,791 B2
• Time in Patent Office: Days
• US Class Current: 187/393
• CPC Class Codes: B66B 1/3492 Position or motion detectors or driving means for the detector B66B1/40, B66B1/50 take precedence; length measuring G01B; speed measuring G01P
• CPC Class Codes: B66B 1/40 and for correct levelling at landings

Abstract

A positioning system for a moveable platform comprising at least one active array comprised of at least one light emitting element for transmitting a binary encoded identification, where the encoding may be spatial or temporal, positioned at a known location, at least one camera for acquiring an image of the at least one active array, component for receiving the binary encoded identification from the image, component for processing the image to determine the position of the active array with respect to the moveable platform, and component for combining the received binary encoded identification and the determined position to calculate a position of the moveable platform.

Claims

1. A positioning system for a moveable platform comprising:

at least one active array comprised of at least one light emitting element for transmitting a binary encoded identification positioned at a known location;

at least one camera for acquiring an image of said at least one active array;

means for receiving said binary encoded identification from said image;

means for processing said image to determine the position of said active array with respect to said moveable platform; and

means for combining said received binary encoded identification and said determined position to calculate a position of said moveable platform.

2. The apparatus of claim 1 wherein said at least one camera is affixed to said moveable platform and said at least one active array is affixed to a doorframe.

3. The apparatus of claim 2 wherein said moveable platform is an elevator.

4. The apparatus of claim 1 wherein of said at least one light emitting elements are selected from the group consisting of a Light Emitting Diode (LED), an IR emitter, a visible light emitter, and a UV frequency light emitter.

5. The apparatus of claim 1 additionally comprising a database in which is stored position information of each of said at least one active array.

7. The method of claim 1 wherein providing said plurality of active arrays comprises providing said at least one light emitting elements selected form the group consisting of a Light Emitting Diode (LED), an IR light emitter, a visible light emitter, and a UV frequency light emitter.

8. The method of claim 1 comprising the additional step of retrieving a position of said active array from a database using said binary encoded identification.

9. The method of claim 1 wherein said affixing said at least one camera to a moveable platform comprises affixing said at least one camera to an elevator.

10. The method of claim 1 comprising the additional step of dynamically configuring at least one of said active arrays.

6. A method for determining a position of a moveable platform comprising the steps of:

providing a plurality of active arrays at fixed positions each active array comprising at least one light emitting element for transmitting a binary encoded identification;

affixing at least one camera to a moveable platform;

imaging at least one of said plurality of active arrays with said at least one camera to produce an image;

performing image processing on said image to receive said binary coded identification and to determine a position with respect to said moveable platform; and

combining said binary coded identification with said position of said active array to determine a location of said moveable platform.