Wireless local area network-based position locating systems and methods

Patent metadata

Field	Value
Publication number	US-9014162-B2
Application number	US-201313903709-A
Country	US
Kind code	B2
Filing date	May 28, 2013
Priority date	Dec 7, 2006
Publication date	Apr 21, 2015
Grant date	Apr 21, 2015

Abstract

The location of one or more mobile nodes in a wireless local area network (WLAN) is determined. Nodes in the WLAN include respective ping drivers to generate ping event values related to transmit count stamps and receive count stamps for wireless messages exchanged between the nodes. Each wireless message is associated with a transmit offset corresponding to an expected transmit time. A sorting module groups the ping event values and produces a difference between the respective receive count stamps and the transmit count stamps for each wireless message. Based on the sorted ping event values, the sorting module generates transmit offset values relating to the transmit offsets. A space-time calibration unit generates, from the sorted differences and the transmit offset values, a clock rate solution and a location solution for at least one of the nodes in the WLAN.

First claim

The invention claimed is:

1. A method for determining location and timing information of one or more nodes in a wireless local area network (WLAN), the method comprising:
generating ping event values corresponding to ping events related to transmit count stamps and receive count stamps for wireless messages exchanged between nodes in the WLAN;
sorting the ping event values corresponding to multiple ones of the ping events that occur within a first predetermined time period;
fo…

Assignees

• Digimarc Corp

Inventors

• Brundage Trent J
• Rhoads Geoffrey B

Classifications

• G01S5/0289 Primary

  Physics · mapped topic

• H04W64/00

  Electricity · mapped topic

• H04W64/003 Primary

  Electricity · mapped topic