Apparatus for visually locating and communicating with mobile robots

• US 4,882,694 A
• Filed: 05/12/1988
• Issued: 11/21/1989
• Est. Priority Date: 08/30/1985
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Christian, Donald J., Brubaker, William B., Slaughter, John, Doty, Thomas J.
• Primary Examiner(s): Chin, Gary
• Application Number:
  US07/195,345
• Time in Patent Office: 558 Days
• Field of Search: 364/424.01, 364/424.02, 364/444, 364/449, 364/450, 364/460, 364/456, 364/443, 180/167-169, 358/103, 358/108
• US Class Current: 701/28
• CPC Class Codes: G05D 1/0234 using optical markers or beacons optical beacons per se G01S1/70
• CPC Class Codes: G05D 1/0272 comprising means for registering the travel distance, e.g. revolutions of wheels measuring distance traversed on the ground by vehicles, e.g. using odometers G01C22/00
• CPC Class Codes: G05D 1/028 using a RF signal

Abstract

A communication system for a mobile apparatus includes a means for communicating commanded destination to the mobile apparatus. The mobile apparatus includes a plurality of beacons that are used for both communicating with a master station and as a means of locating the mobile apparatus by the master station. The location of the mobile apparatus is used to generate commands which are transmitted to the mobile apparatus by light emitting diodes such that the light emitting diodes mounted on the mobile apparatus are used for both navigation purposes and communication.

Claims

1. A combined communication and positioning system for a mobile apparatus, comprising:

an apparatus light source mounted on the mobile apparatus;

a modulator electrically connected to the apparatus light source, wherein the modulator is for generating modulating data to be sent to the apparatus light source to modulate the light output of the apparatus light source;

a fixed light receiver off board the mobile apparatus for receiving data in the form of the modulated light from the mobile apparatus light source;

a fixed demodulator electrically connected to the fixed light receiver, for demodulating the light received from the apparatus light source;

a camera off board the mobile apparatus for forming an image of the apparatus light source to locate the position of the mobile apparatus; and

means for correlating said position of the mobile apparatus with the said data in the form of the modulated light received from the mobile apparatus light source, and for generating and transmitting navigation commands to said mobile apparatus, based upon said correlation.

2. The system of claim 1, further comprising:

a navigation beacon controller for turning on the apparatus light source to allow the camera to form said image of the apparatus light source.

3. The system of claim 2, wherein the navigation beacon controller is for turning the apparatus light source on and off in a blinking pattern.

4. The system of claim 1, further comprising:

a fixed light source for transmitting modulated light data; and

an apparatus light receiver for receiving the modulated light data from the fixed light source, wherein the apparatus light receiver is mounted on the mobile apparatus.

5. The system of claim 4, further comprising:

an apparatus demodulator electrically connected to the apparatus light receiver, for demodulating the light received from the fixed light source.

6. The system of claim 1 wherein the camera is a raster scan camera for determining X and Y coordinates of the mobile apparatus.

7. The system of claim 4 wherein the apparatus light source and the fixed light source are each comprised of one or more LEDs operating in the infrared portion of the light spectrum.

8. The system of claim 1, wherein the modulating data is mobile apparatus position data.

14. The system of claim 4, wherein the modulated light data is mobile apparatus position command data.

9. A combined communication and positioning system for a mobile apparatus, comprising:

a camera off board the mobile apparatus for detecting an apparatus light source mounted onthe mobile apparatus, to locate the X-Y position of the mobile apparatus;

means for modulating the light output by the apparatus light source;

a fixed light detector off board the mobile apparatus for detecting data in the form of the modulated light output by the apparatus light source;

a fixed demodulator electrically connected to the fixed light detector, to demodulate the modulated light output by the apparatus light source; and

means for correlating said position of the mobile apparatus with the said data in the form of the modulated light received from the mobile apparatus light source, and for generating and transmitting navigation commands to said mobile apparatus, based upon said correlation.

10. The system of claim 9, further comprising:

a fixed light source mounted off board the mobile apparatus, for trasmitting the modulated light to the mobile apparatus.

11. The system of claim 10, further comprising:

an apparatus light detector mounted on the mobile apparatus, to detect the modulated light output by the fixed light source.

12. The system of claim 11, further comprising:

an apparatus demodulator electrically connected to the apparatus light detector, to demodulate the modulated light detected by the apparatus light detector.

13. The system of claim 9, further comprising:

a control and navigation circuit electrically connected to the camera to determine the location of the mobile apparatus, and electrically connected to the fixed demodulator to receive demodulated light from the fixed demodulator.