Asset tracking using wireless LAN infrastructure

• US 7,256,681 B1
• Filed: 10/20/2000
• Issued: 08/14/2007
• Est. Priority Date: 10/20/2000
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Moody, John O., Steinbrecher, Eric R.
• Primary Examiner(s): Zimmerman; Brian
• Assistant Examiner(s): NGUYEN, NAM V
• Application Number:
  US09/692,538
• Time in Patent Office: 2,489 Days
• Field of Search: 340/10.1, 340/10.3, 340/10.32, 340/10.42, 340/10.51, 340/10.52, 340/572.1, 340/825.69, 340/10.4, 370/331, 370/352, 370/347, 370/412, 370/85.7, 455/524, 600/300, 709/224, 709/225, 128/903, 128/630, 128/904
• US Class Current: 340/10.1
• CPC Class Codes: G06Q 10/08 Logistics, e.g. warehousing, loading or distribution; Inventory or stock management

Abstract

Transponders capable of providing identification information and possibly additional information are detected from wireless access points of a computer network as a substitute for closed radio frequency identification (RFID) systems while providing numerous additional functionalities and applications. Total asset visibility or responses to more limited queries are provided by inclusion of a geographic information system software application. Location reporting of proximity of devices/transponders to access points can be enhanced to a fine-grained level by triangulation or other algorithms including neural networks.

Claims

1. An asset tracking system including

a computer network supporting a plurality of wireless links from respective wireless access points of said computer network,

a transponder detectable by said wireless access points of said computer network, said transponder including means for transmitting identification information corresponding to said transponder in accordance with a wireless network protocol in response to an interrogation signal from one of the wireless access points of said computer network whereby a wireless access point/wireless device association for said transponder is created and stored in one of said computer network and said transponder,

means for resolving location of said transponder based on signals communicating said identification information to wireless access points of said computer network, and

means for accessing and reporting through said computer network internal network wireless access point/wireless device associations including said wireless access point/wireless device association for said transponder from said wireless access points, said means for accessing and reporting internal access point/wireless device associations including a geographic information system resident on or downloadable to a terminal of said computer network.

2. A system as recited in claim 1, further including

means for associating internal network access point information with geographical locations.

3. A system as recited in claim 2, further including

means for reporting identification information associated with geographical locations to a user of said computer network.

4. A system as recited in claim 1, further including

means for determining proximity of said transponder to an access point.

5. A system as recited in claim 4, wherein said means for determining proximity includes triangulation means.

6. A system as recited in claim 4, wherein said means for determining proximity includes quadratic optimization means.

7. A system as recited in claim 4, wherein said means for determining proximity includes a neural network.

8. A system as recited in claim 4, further including

means for associating internal network access point information with geographical locations.

9. A system as recited in claim 8, further including

means for reporting identification information associated with geographical locations to a user of said computer network.