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:
Dec. 01, 2020
Filed:
Jan. 04, 2017
Husqvarna Ab, Huskvarna, SE;
Björn Mannefred, Jönköping, SE;
Stefan Grufman, Bankeryd, SE;
HUSQVARNA AB, Huskvarna, SE;
Abstract
A method of navigating a self-propelled robotic tool comprises transmitting a wireless signal () along a first signal path between the robotic tool () and a first wireless interface of a base station () remote from the robotic tool (); transmitting a wireless signal () along a second signal path between the robotic tool () and a second wireless interface of the base station (), said second wireless interface being spatially separated from the first wireless interface by a separation distance; upon receipt, comparing the signal transmitted along the first signal path with the signal transmitted along the second signal path to obtain a propagation time difference between the signal transmitted along the first signal path and the signal transmitted along the second signal path, said propagation time difference defining a path length difference between said first and second signal paths; and calculating, based on the separation distance and the path length difference, a value representative of a bearing (φ) from the base station () to the robotic tool ().