Locating an object using GPS with additional data

• US 20020030625A1
• Filed: 06/22/2001
• Published: 03/14/2002
• Est. Priority Date: 06/23/2000
• Status: Active Grant

• Current Assignee: Sportsmedia Technology Corporation
• Original Assignee: Sportvision, Inc. (Sportsmedia Technology Corporation)
• Inventors: White, Marvin S., Cavallaro, Richard H., Milnes, Kenneth A., Honey, Stanley K.
• Granted Patent: US 6,657,584 B2
• Time in Patent Office: Days
• US Class Current: 342/357.06
• CPC Class Codes: G01C 21/28 with correlation of data from several navigational instruments
• CPC Class Codes: G01S 19/11 wherein the cooperating elements are pseudolites or satellite radio beacon positioning system signal repeaters
• CPC Class Codes: G01S 19/19 Sporting applications
• CPC Class Codes: G01S 19/41 Differential correction, e.g. DGPS [differential GPS]
• CPC Class Codes: G01S 19/426 by combining or switching between position solutions or signals derived from different modes of operation in a single system
• CPC Class Codes: G01S 19/45 by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement
• CPC Class Codes: G01S 19/46 the supplementary measurement being of a radio-wave signal type
• CPC Class Codes: G01S 19/47 the supplementary measurement being an inertial measurement, e.g. tightly coupled inertial
• CPC Class Codes: G01S 19/50 whereby the position solution is constrained to lie upon a particular curve or surface, e.g. for locomotives on railway tracks
• CPC Class Codes: G01S 5/0027 of actual mobile position, i.e. position determined on mobile
• CPC Class Codes: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station
• CPC Class Codes: G01S 5/0054 of actual mobile position, i.e. position calculation on base station

Abstract

A system is disclosed that uses GPS and additional data to determine the location of an object. Typically, GPS receivers need valid data from four satellites to accurately determine a three dimensional location. If a GPS receiver is receiving valid data from fewer than four satellites, then additional data is used to compensate for the shortage of satellites in view of the GPS receiver. Examples of additional data includes a representation of the surface that the object is traveling on, an accurate clock, an odometer, dead reckoning information, pseudolite information, and error correction information from a differential reference receiver. An exemplar use of the disclosed system is to concurrently track a set of one or more automobiles during a race. The determined locations of the automobile can be used to provide route information, to generate statistics and/or to edit video of one or more of the automobiles.

Claims

1. A method of tracking a moving object using GPS, comprising the steps of:

receiving GPS data;

accessing a representation of a surface, said object traveling on said surface; and

using said representation of said surface with GPS data from no more than three useful satellites to determine a location of said object.

2. A method according to claim 1, wherein:

said representation of said surface is a three dimensional representation of said surface.

3. A method according to claim 1, wherein:

said representation of said surface is a two dimensional ribbon in three dimensional space.

4. A method according to claim 1, wherein:

said object is an automobile; and

said surface is a road.

5. A method according to claim 1, further including the step of:

creating said representation of said surface.

6. A method according to claim 1, wherein:

said GPS data is received from a satellite.

7. A method according to claim 1, wherein:

at least a subset of said GPS data is from a pseudolite.

8. A method according to claim 1, further including the step of:

receiving an error signal from a reference receiver, said step of using also uses said error signal to determine said location of said object.

9. A method according to claim 1, further including the step of:

transmitting information based on said GPS data to a processor location, said processor location is different than said location of said object, said steps of using said representation and receiving an error signal are performed at said processor location.

10. A method according to claim 1, further including the step of:

receiving timing information from a high quality clock device, said step of using also uses said timing information for a short period of time if GPS data is only accurately available for two useful satellites.

11. A method according to claim 10, wherein:

said high quality clock device is a quartz oscillator.

12. A method according to claim 10, further including the step of:

receiving odometer information, said step of using also uses said odometer information if GPS data is only accurately available for one useful satellite.

13. A method according to claim 12, further including the step of:

predicting a path of said object, said step of using also uses said path if GPS data is not accurately available.

14. A method according to claim 1, further including the step of:

predicting a path of said object, said step of using also uses said path if GPS data is only accurately available for two useful satellites.

15. A method according to claim 1, further including the step of:

receiving odometer information, said step of using also uses said odometer information if GPS data is only accurately available for two useful satellites.

16. A method according to claim 1, further including the step of:

communicating said determined location to a GPS receiver, said received GPS data is received from said GPS receiver, said GPS receiver uses said location to lock in a fix.

17. A method according to claim 1, further including the steps of:

receiving video of said object;

converting said location of said object to a position in said video; and

adding an image to said video based on said position.

19. A method according to claim 18, wherein:

said step of determining includes using third additional data if said GPS data only includes valid data no more than one useful GPS sources.

20. A method according to claim 19, wherein:

said first additional data is from a representation of a surface, said object traveling on said surface;

said second additional data is from a timing device; and

said third additional data is from an odometer.

21. A method according to claim 19, wherein:

said step of determining includes using fourth additional data if said GPS data does not include valid data.

22. A method according to claim 19, wherein:

said first additional data is from a representation of a surface, said object traveling on said surface;

said second additional data is from a timing device;

said third additional data is from an odometer; and

said fourth additional data is based on a prediction of a path of said object.

24. A method according to claim 23 wherein:

said GPS data is based on valid information received by said GPS receiver from no more than three useful GPS sources.

25. A method according to claim 23, further including the step of:

using said location to fix on said location using new valid information from GPS sources.

26. A method according to claim 23, wherein:

said error correction data includes three dimensional information about a surface, said object traveling on said surface.

27. A method according to claim 26, wherein:

said error correction data includes timing information.

28. A method according to claim 23, wherein:

said error correction data includes timing information.

30. An apparatus according to claim 29, wherein:

said object is an automobile on a road.

31. An apparatus according to claim 29, further including:

a receiver in communication with said transmitter; and

a computer in communication with said receiver, said receiver and said computer are located remote from said object.

32. An apparatus according to claim 29, further including:

a data communication receiver in communication with said GPS processor and located with said object;

a reference GPS receiver, and

a data communication transmitter in communication with said data communication receiver, said data communication transmitter located with and in communication with said reference GPS receiver.

18. A method of tracking a moving object using GPS, comprising the steps of:

receiving GPS data; and

determining a location of said object based on said GPS data, first additional data if said GPS data only includes valid data no more than three GPS sources and second additional data if said GPS data only includes valid data no more than two useful GPS sources.

23. A method of tracking a moving object using GPS, comprising the steps of:

receiving GPS data from a GPS receiver;

receiving error correction data from a non-GPS source;

determining a location of said object based on said GPS data and said error correction data; and

communicating said location to said GPS receiver.

29. An apparatus for tracking a moving object:

a GPS receiver located with said object;

a processor in communication with said GPS receiver and located with said object;

a storage device in communication with said processor and located with said object; and

a transmitter in communication with said processor and located with said object.