Method and apparatus for detecting a path of travel or direction of travel

• US 20080001783A1
• Filed: 06/28/2006
• Published: 01/03/2008
• Est. Priority Date: 06/28/2006
• Status: Active Grant

• Current Assignee: Savi Technology Incorporated
• Original Assignee: Savi Technology Incorporated
• Inventors: Cargonja, Nikola, Nardelli, Albert
• Granted Patent: US 8,120,512 B2
• Time in Patent Office: Days
• US Class Current: 340/988
• CPC Class Codes: G08G 1/096783 where the origin of the information is a roadside individual element
• CPC Class Codes: G08G 1/096791 where the origin of the information is another vehicle

Abstract

Spaced first and second signposts transmit wireless signals containing different signpost identifications. A first path of travel passes through the transmission range of the first signpost, and a second path of travel passes through the transmission range of the second signpost but not the transmission range of the first signpost. A different configuration includes plural hallways extending away from a common intersection in respective directions, with a respective signpost in each hallway that transmits wireless signals containing a respective different signpost identification. Another configuration includes a hallway with first and second portions of different width, a first signpost in the first portion transmitting wireless signals containing a first signpost identification, and spaced second and third signposts in the second portion each transmitting wireless signals containing a second signpost identification different from the first signpost identification, and having a transmission range less than a width of the second portion.

Claims

1. An apparatus comprising:

first and second signposts that are supported at spaced locations, and that each transmit wireless signpost signals having a transmission range and containing a signpost identification, the signpost identification in signpost signals from said first signpost being different from the signpost identification in signpost signals from said second signpost;

structure defining spaced first and second paths of travel that are approximately parallel, said first path of travel passing through the transmission range of signpost signals from said first signpost, said second path of travel passing through the transmission range of signpost signals from said second signpost, and said second path of travel being outside the transmission range of signpost signals from said first signpost.

2. An apparatus according to claim 1, including a reader configured to receive wireless tag signals that are different from said signpost signals and that originate within a reception range of said reader, said first and second signposts each being disposed within said reception range of said reader.

3. An apparatus according to claim 2, including a tag that can be moved relative to said signposts and that includes:

a receiver section configured to receive wireless signpost signals transmitted by either of said first and second signposts;

a transmitter section that can transmit wireless tag signals; and

a further section that causes said transmitter section to include in at least one of the wireless tag signals each signpost identification received by said receiver section in signpost signals from either of said first and second signposts.

4. An apparatus according to claim 3, including a section responsive to the signpost identifications received by said reader in said wireless tag signals for determining which of said paths of travel said tag is currently moving along.

5. An apparatus according to claim 1, wherein said structure defines spaced first and second lanes for vehicles, said first and second paths of travel respectively extending along said first and second lanes, said first and second signposts being disposed on opposite sides of said first lane.

6. An apparatus according to claim 1, including a third signpost that is supported at a location spaced from said first and second signposts, and that transmits wireless signpost signals having a transmission range and containing a signpost identification different from the signpost identifications in signpost signals from said first and second signposts, said second path of travel passing through the transmission range of signpost signals from said third signpost, and said first path of travel passing through the transmission range of signpost signals from one of said second and third signposts and being outside the transmission range of signpost signals from the other thereof.

7. An apparatus according to claim 6, including a reader configured to receive wireless tag signals that are different from said signpost signals and that originate within a reception range of said reader, said first, second and third signposts each being disposed within said reception range of said reader.

8. An apparatus according to claim 7, including a tag that can be moved relative to said signposts and that includes:

a receiver section configured to receive wireless signpost signals transmitted by any of said first, second and third signposts;

a transmitter section that can transmit wireless tag signals; and

a further section that causes said transmitter section to include in at least one of the wireless tag signals each signpost identification received by said receiver section in a signpost signal from any of said first, second and third signposts.

9. An apparatus according to claim 8, wherein said further section also causes said transmitter section to include in at least one of the wireless tags signals information representing an order in which signpost signals from any of said first, second and third signposts were received by said tag.

10. An apparatus according to claim 8, including a section responsive to the signpost identifications in said wireless tag signals received by said reader for determining at least one of:

a current direction of movement of said tag along one of said paths of travel; and

which of said paths of travel said tag is currently moving along.

11. An apparatus according to claim 6, wherein said structure defines spaced first and second lanes for vehicles, said first and second paths of travel respectively extending along said first and second lanes, said second signpost being disposed between said first and second lanes, said first signpost being disposed on a side of said first lane opposite from said second signpost, and said third signpost being disposed on a side of said second lane opposite from said second signpost.

12. An apparatus according to claim 1, including a third signpost that transmits wireless signpost signals having a transmission range and containing a signpost identification different from the signpost identifications in signpost signals from said first and second signposts, said third signpost being spaced from said first and second signposts in a direction parallel to said paths of travel, at least one of said first and second paths of travel passing through the transmission range of signpost signals from said third signpost.

13. An apparatus according to claim 12, including a fourth signpost that transmits wireless signpost signals having a transmission range and containing a signpost identification different from the signpost identifications in signpost signals from said first, second and third signposts, said fourth signpost being spaced from said third signpost, and being spaced from said first and second signposts in a direction parallel to said paths of travel, said one of said first and second paths of travel being outside the transmission range of signpost signals from said fourth signpost, and the other of said first and second paths of travel passing through the transmission range of signpost signals from said fourth signpost.

14. A method comprising:

transmitting wireless signpost signals from each of first and second signposts that are supported at spaced locations, said wireless signpost signals each having a transmission range and containing a signpost identification, the signpost identification in signpost signals from said first signpost being different from the signpost identification in signpost signals from said second signpost; and

defining spaced first and second paths of travel that are approximately parallel, said first path of travel passing through the transmission range of signpost signals from said first signpost, said second path of travel passing through the transmission range of signpost signals from said second signpost, and said second path of travel being outside the transmission range of signpost signals from said first signpost.

15. A method according to claim 14, including receiving wireless tag signals in a reader supported so that said first and second signposts are each disposed within a reception range of said reader, said wireless tag signals being different from said signpost signals and originating within the reception range of said reader.

16. A method according to claim 15, including:

providing a tag that can be moved relative to said signposts, that can transmit wireless tag signals, and that can receive wireless signpost signals transmitted by either of said first and second signposts; and

causing said tag to transmit wireless tag signals and to include in at least one of the wireless tag signals each signpost identification received by said tag in signpost signals from either of said first and second signposts.

17. A method according to claim 16, including responding to the signpost identifications received by said reader in said wireless tag signals by determining which of said paths of travel said tag is currently moving along.

18. A method according to claim 14, including:

supporting a third signpost at a location spaced from said first and second signposts;

transmitting from said third signpost wireless signpost signals having a transmission range and containing a signpost identification different from the signpost identifications in signpost signals from said first and second signposts; and

wherein said defining of said first and second paths of travel includes positioning said second path of travel so that it passes through the transmission range of signpost signals from said third signpost, and positioning said first path of travel so that it passes through the transmission range of signpost signals from one of said second and third signposts and is outside the transmission range of the other thereof.

19. A method according to claim 18, including receiving wireless tag signals in a reader supported so that said first, second and third signposts are each disposed within a reception range of said reader, said wireless tag signals being different from said signpost signals, and originating within a reception range of said reader.

20. A method according to claim 19, including:

providing a tag that can be moved relative to said signposts, that can transmit wireless tag signals, and that can receive wireless signpost signals transmitted by any of said first, second and third signposts; and

causing said tag to include in at least one of the wireless tag signals each signpost identification received by said tag in a signpost signal from any of said first, second and third signposts.

21. A method according to claim 20, including causing said tag to include in at least one of the wireless tag signals information representing an order in which signpost signals from any of said first, second and third signposts were received by said tag.

22. A method according to claim 20, including responding to the signpost identifications in said wireless tag signals received by said reader by determining at least one of:

a current direction of movement of said tag along one of said paths of travel; and

which of said paths of travel said tag is currently moving along.

23. A method according to claim 14, including:

supporting a third signpost at a location spaced from said first and second signposts in a direction parallel to said paths of travel;

transmitting from said third signpost wireless signpost signals having a transmission range and containing a signpost identification different from the signpost identifications in signpost signals from said first and second signposts; and

wherein said defining of said first and second paths of travel includes positioning at least one of said first and second paths of travel so that it passes through the transmission range of signpost signals from said third signpost.

24. A method according to claim 23, including:

supporting a fourth signpost at a location spaced from said third signpost, and spaced from said first and second signposts in a direction parallel to said paths of travel;

transmitting from said fourth signpost wireless signpost signals having a transmission range and containing a signpost identification different from the signpost identifications in signpost signals from said first, second and third signposts; and

wherein said defining of said first and second paths of travel includes positioning said one of said first and second paths of travel so that it is outside the transmission range of signpost signals from said fourth signpost, and positioning the other of said first and second paths of travel so that it passes through the transmission range of signpost signals from said fourth signpost.

25. An apparatus comprising:

structure defining a plurality of hallways that each extend away from a common intersection in a respective different direction; and

a plurality of signposts that are each supported in a respective said hallway and that each transmit wireless signpost signals having a transmission range and containing a signpost identification, the signpost identification in signpost signals from each said signpost being different from the signpost identification in signpost signals from each of the other said signposts.

26. An apparatus according to claim 25, including a tag that can be moved relative to said signposts and that includes:

a receiver section configured to receive wireless signpost signals transmitted by any of said signposts;

a transmitter section that can transmit wireless tag signals that are different from said signpost signals; and

a further section that causes said transmitter section to include in at least one of the wireless tag signals each signpost identification received by said receiver section in a signpost signal from any of said signposts.

27. An apparatus according to claim 26, including:

a reader configured to receive the wireless tag signals; and

a section responsive to signpost identifications received by said reader in said wireless tag signals for determining at least one of;

a path of travel of said tag; and

a current direction of movement of said tag.

28. An apparatus according to claim 25, wherein one of said hallways has two of said signposts therein that are transversely spaced and that transmit respective signpost signals containing the same said signpost identification, said one hallway being wider than the transmission range of signpost signals transmitted by either of the signposts in that hallway.

29. A method comprising:

supporting each of a plurality of signposts in a respective one of a plurality of hallways that each extend away from a common intersection in a respective different direction; and

transmitting from each said signpost wireless signpost signals that have a transmission range and that contain a signpost identification, the signpost identification in signpost signals from each said signpost being different from the signpost identification in signpost signals from each of the other said signposts.

30. A method according to claim 29, including:

providing a tag that can be moved relative to said signposts, that can transmit wireless tag signals different from said signpost signals, and that can receive wireless signpost signals transmitted by any of said signposts; and

causing said tag to include in at least one of the wireless tag signals each signpost identification received by said tag in a signpost signal from any of said signposts.

31. A method according to claim 30, including:

receiving wireless tag signals in a reader supported so that said signposts are each disposed within a reception range of said reader; and

responding to signpost identifications received by said reader in said wireless tag signals by determining at least one of;

a path of travel of said tag; and

a current direction of movement of said tag.

32. A method according to claim 29,

including supporting a further signpost in one said hallway so that said signposts in said one hallway are transversely spaced;

and

transmitting from said further signpost wireless signpost signals that have a transmission range and that contain a signpost identification, the signpost signals transmitted by each of said signposts in said one hallway containing the same signpost identification, and said one hallway being wider than the transmission range of signpost signals transmitted by either of the signposts in that hallway.

33. An apparatus comprising:

structure defining a hallway having a first portion with a first width and a second portion with a second width greater than said first width; and

a first signpost supported in said first portion of said hallway, and transversely spaced second and third signposts supported in said second portion of said hallway, said signposts each transmitting wireless signpost signals that have a transmission range and that each contain a signpost identification, the signpost identification in signpost signals from each of said second and third signposts being the same, and the signpost identification in signpost signals transmitted by said first signpost being different from the signpost identification in signpost signals from said second and third signposts, and said second width being greater than the transmission range of signpost signals from either of said second and third signposts.

34. An apparatus according to claim 33, including a tag that can be moved relative to said signposts and that includes:

a receiver section configured to receive wireless signpost signals transmitted by any of said signposts;

a transmitter section that can transmit wireless tag signals that are different from said signpost signals; and

a further section that causes said transmitter section to include in at least one of the wireless tag signals each signpost identification received by said receiver section in a signpost signal from any of said signposts.

35. An apparatus according to claim 34, including:

a reader configured to receive the wireless tag signals; and

a section responsive to the signpost identifications received by said reader in said wireless tag signals for determining a current direction of movement of said tag.

36. A method comprising:

supporting a first signpost in a first portion of a hallway, said first portion having a first width; and

supporting transversely spaced second and third signposts in a second portion of said hallway having a second width greater than said first width; and

transmitting from each said signpost wireless signpost signals that have a transmission range and that each contain a signpost identification, the signpost identification in signpost signals from each of said second and third signposts being the same, and the signpost identification in signpost signals transmitted by said first signpost being d different from the signpost identification in signpost signals from said second and third signposts, and said second width being greater than the transmission range of signpost signals from either of said second and third signposts.

37. A method according to claim 36, including:

providing a tag that can be moved relative to said signposts, that can transmit wireless tag signals different from said signpost signals, and that can receive wireless signpost signals transmitted by any of said signposts; and

causing said tag to include in at least one of the wireless tag signals each signpost identification received by said tag in a signpost signal from any of said signposts.

38. A method according to claim 37, including:

receiving wireless tag signals in a reader supported so that said signposts are each disposed within a reception range of said reader; and

responding to signpost identifications received by said reader in said wireless tag signals by determining a current direction of movement of said tag.