Accurate stepmeter for location-based services

• US 6,614,352 B2
• Filed: 10/31/2001
• Issued: 09/02/2003
• Est. Priority Date: 10/31/2001
• Status: Expired due to Fees

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Pellet, Yannick, Jaworek, Dominik
• Primary Examiner(s): Lee, Benjamin C.
• Assistant Examiner(s): Nguyen, Phung
• Application Number:
  US09/999,105
• Publication Number:
  US 20030080869A1
• Time in Patent Office: 671 Days
• Field of Search: 340/573.1, 340/545.1, 340/566, 340/323.R, 340/539, 702/145, 702/160
• US Class Current: 340/573.1
• CPC Class Codes: G01C 21/20 Instruments for performing navigational calculations G01C21/24, G01C21/26 take precedence
• CPC Class Codes: G01C 22/006 Pedometers
• CPC Class Codes: G08G 1/005 including pedestrian guidance indicator
• CPC Class Codes: G08G 1/20 Monitoring the location of vehicles belonging to a group, e.g. fleet of vehicles, countable or determined number of vehicles

Abstract

A system and method for determining the progress and position of a pedestrian. The shoes of the user are each provided with communicating sensors. The sensors sense when a step has been taken and communicate with each other through Bluetooth, 802.11b, or some other such short-range wireless protocol. This communication includes a distance measurement, and the distance between sensors is calculated and stored with each step, the sensors being in communication with a central processor for this purpose. The sensors also determine their own orientation and their orientation relative to the other sensor, communicating this directional information to the central processor as well. The direction information is used to calculate the direction of travel and, combined with the accumulated distance measurements, the position of a user.

Claims

1. A system for determining the progress of a pedestrian relative to a starting point, comprising:

a first footstep sensor;

a second footstep sensor in radio communication with the first sensor via a short-range radio link, wherein the sensors are operable according to a short-range radio protocol providing for mutual radio-link length determination; and

a processor coupled to receive radio-link length information from the first step sensor and the second step sensor to determine progress information.

2. The system of claim 1, wherein the progress information comprises the distance between the first footstep sensor and the second footstep sensor as determined from a radio signal received by at least one of the sensors.

3. The system of claim 1, wherein the progress information comprises the orientation of at least one of the sensors relative to a reference direction.

4. The system of claim 3, further comprising at least one electronic compass.

5. The system of claim 4, wherein the at least one electronic compass is located to determine the orientation of the at least one of the sensors.

6. The system of claim 1, wherein the progress information comprises the direction of the radio communication signal between the first footstep sensor and the second footstep sensor.

7. The system of claim 6, wherein the processor uses the direction of the radio communication signal to approximate the direction of travel of the pedestrian.

8. The system of claim 7, wherein the processor combines the distance and direction-of-travel measurements to determine a pedestrian location relative to the starting point.

9. The system of claim 1, wherein the processor is resident in a mobile station in radio communication with at least one of the sensors.

10. A method for determining the progress of a pedestrian from a starting location, said method comprising the steps of:

providing a first step sensor proximate to one foot of the pedestrian;

providing a second step sensor proximate to the other foot of the pedestrian;

the second step sensor for radio communication with the first sensor via a short-range radio link, wherein the sensors are operable according to a short-range radio protocol providing for mutual radio-link length determination;

detecting that a footstep has been taken;

analyzing, upon detecting that a footstep has been taken, radio signals transmitted between the first step sensor and the second step sensor to mutually determine the distance between them;

recording the determined distance in a memory device; and

repeating the detecting, analyzing, and recording steps until the pedestrian has reached an ending location, wherein the recording step includes calculating a cumulative distance and recording at least the cumulative distance.

11. The method of claim 10, further comprising the step of providing a mobile station in communication with at least one of the sensors, the mobile station for receiving determined distances from the at least one sensor.

12. The method of claim 11, wherein the mobile station includes the memory in which the determined distances are stored.

13. The method of claim 11, wherein the cumulative distance calculation is performed in the mobile station.

14. The method of claim 11, wherein the mobile station is capable of communicating with a communications network to access a remote server.

15. The method of claim 14, further comprising the step of transmitting progress information from the mobile station to the remote server through the network.

16. The method of claim 10, further comprising the step of providing a directional indicator for indicating the direction of orientation of at least one of the sensors relative to a reference orientation.

17. The method of claim 16, wherein the direction indicator is a compass.

18. The method of claim 16, further comprising the step of measuring, upon detecting that a footstep has been taken, the orientation of at least one of the sensors relative to a reference direction.

19. The method of claim 10, further comprising the step of determining, upon detecting that a footstep has been taken, the relative orientation of the first sensor and the second sensor.

20. The method of claim 19, further comprising the step of using the relative orientation to determine a direction of travel.

21. The method of claim 20, further comprising the step of using the measured distance and the relative orientation to determine the location of the pedestrian relative to the starting location.

22. The method of claim 21, further comprising the step of repeatedly determining the location of the pedestrian as subsequent footsteps are detected.

23. The method of claim 21, further comprising the step of storing multiple distance measurements and relative orientation such that the position of the pedestrian after a certain footstep relative to the starting location may be calculated.