Vehicle remote function system and method using ultra-wide band signals

1. A vehicle remote function system for determining a location of a fob relative to a vehicle, the system comprising:

a plurality of antennas adapted to be mounted at different locations in the vehicle, each antenna for use in transmitting and/or receiving ultra-wide band wireless signals to and/or from the fob; and

a controller adapted to be mounted in the vehicle and configured for communication with the antennas, the controller for use in determining the location of the fob relative to the vehicle based on ultra-wide band wireless signals transmitted between the antennas and the fob;

wherein the controller is configured to locate the fob within one of a plurality of three-dimensional zones, one of the plurality of zones configured to have a substantially polygonal cross-section in a horizontal plane and wherein the controller is configured to recognize back and forth movement of the fob between a combination of zones as a command to perform a vehicle function.

2. The system of claim 1 wherein the one of the plurality of zones configured to have a non-spherical shape is configured to substantially envelope the vehicle.

3. The system of claim 1 wherein the one of the plurality of zones configured to have a non-spherical shape is configured to have a substantially rectangular cross-section in a horizontal plane.

4. The system of claim 1 wherein the one of the plurality of zones configured to have a non-spherical shape is configured to be positioned substantially outside the vehicle.

5. The system of claim 4 wherein the one of the plurality of zones configured to have a non-spherical shape is configured to be positioned on a side of the vehicle and to have a volume less than a volume of the vehicle.

6. The system of claim 1 wherein the one of the plurality of zones is configured to have a volume less than a volume of a person.

7. The system of claim 6 wherein the one of the plurality of zones is configured to be positioned substantially outside the vehicle.

8. The system of claim 1 wherein the one of the plurality of zones is configured to be positioned substantially inside the vehicle.

9. The system of claim 1 wherein the plurality of antennas comprise an antenna adapted to be mounted in a vehicle headliner and an antenna adapted to be mounted in a vehicle instrument panel.

10. The system of claim 1 wherein the controller is configured to determine the location of the fob using one of a Kalman filter, trilateration and triangulation.

11. A vehicle remote function system for determining a location of a fob relative to a vehicle, the system comprising:

a controller adapted to be mounted in the vehicle and configured for communication with a plurality of antennas mounted at different locations in the vehicle, the controller for use in determining the location of the fob based on ultra-wide band wireless signals transmitted between the antennas and the fob;

wherein the controller is configured to locate the fob within one of a plurality of three-dimensional zones, one of the plurality of zones configured to have a substantially polygonal cross-section in a horizontal plane and wherein the controller is configured to recognize back and forth movement of the fob between a combination of zones as a command to perform a vehicle function.

12. The system of claim 11 wherein the one of the plurality of zones configured to have a non-spherical shape is configured to substantially envelope the vehicle.

13. The system of claim 11 wherein the one of the plurality of zones configured to have a non-spherical shape is configured to have a substantially rectangular cross-section in a horizontal plane.

14. The system of claim 11 wherein the one of the plurality of zones configured to have a non-spherical shape is configured to be positioned substantially outside the vehicle.

15. The system of claim 14 wherein the one of the plurality of zones configured to have a non-spherical shape is configured to be positioned on a side of the vehicle and to have a volume less than a volume of the vehicle.

16. The system of claim 11 wherein the one of the plurality of zones is configured to have a volume less than a volume of a person.

17. A method for use in a vehicle remote function system, the method for determining a location of a fob relative to a vehicle, the method comprising:

transmitting ultra-wide band wireless signals between the vehicle and the fob; and

determining the location of the fob within one of a plurality of three-dimensional zones, one of the plurality of zones having a substantially polygonal cross-section in a horizontal plane, based on the ultra-wide band wireless signals transmitted between the vehicle and the fob, wherein back and forth movement of the fob between a combination of zones acts as a command to perform a vehicle function.

18. The method of claim 17 wherein the one of the plurality of zones having a non-spherical shape substantially envelopes the vehicle.

19. The method of claim 17 wherein the one of the plurality of zones having a non-spherical shape is positioned substantially outside the vehicle on a side of the vehicle and has a volume less than a volume of the vehicle.

20. The method of claim 17 wherein the one of the plurality of zones has a volume less than a volume of a person.