The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2013
Filed:
Dec. 04, 2009
Paul A. Dahl, Pleasant Grove, UT (US);
Paul A. Dahl, Pleasant Grove, UT (US);
Digi International Inc., Minnetonka, MN (US);
Abstract
The physical position of a movable node in a network is determined by sending a broadcast message from the movable node repeated through a path comprising at least a first node, a second node, and a third node, wherein the first, second, and third nodes have known locations. The movable node receives the broadcast message from the first, second, and third nodes, and measures the time from sending the repeated broadcast message to the time the broadcast message is received from each of the first, second, and third nodes. The movable node determines the distance from the movable node to the first, second, and third network nodes by using at least a known turnaround time and known message propagation velocity, such that the position of the movable node is determined.