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:
Mar. 26, 2002
Filed:
Dec. 16, 1999
Bo Lindell, Lidingö, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
The invention provides a solution to the problem of providing an inexpensive and simple compass unit which, nevertheless, compensates automatically for different deviations in the Earth's magnetic field at different places in the world. Briefly, the solution involves an novel electronic compass unit, a method in the operation of the compass unit, and a cellular radio communication system. An electronic compass unit constructed in accordance with the invention and located within an area covered by the radio communication system receives information concerning the local magnetic deviation from the correct direction to the geographic North Pole from a data storage unit which is central to the system, through the medium of a connected radio unit. Information concerning the local magnetic deviation is sent from the central data storage unit to respective radio units from a radio base station situated close to said radio unit, via a downlink.