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:
Apr. 30, 1996
Filed:
Nov. 17, 1994
Thomas R Kronhamn, Halso, SE;
Telefonaktiebolaget LM Ericsson, Stockholm, SE;
Abstract
A method for determining the direction to a signal source by cooperation between a first device which determines the direction to the signal source with a low angular accuracy and a second device which determines the direction to the signal source with a high angular accuracy. In a first step, the direction to the signal source is determined within a certain angular range and, through analysis of the signal transmitted from the signal source, the category of the signal source is determined. In a subsequent second step, an angular search for a signal source of said category is performed within the angular range, in which the search is interrupted in the direction in which a signal of the category is detected. In a subsequent third step, the detected signals are correlated with respect to time. When correlation is present, the direction to the signal source is determined by determination of the direction in which the signal source is detected. When correlation is not present, the search is continued until a new signal source of the category is detected, at which time the search is again interrupted and the third step is repeated. An apparatus is also disclosed.