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. 25, 2008
Filed:
Nov. 30, 2004
Pauli Misikangas, Helsinki, FI;
Petri Myllymäki, Helsinki, FI;
Pauli Misikangas, Helsinki, FI;
Petri Myllymäki, Helsinki, FI;
Ekahau Oy, Helsinki, FI;
Abstract
A target device's location is estimated by a location estimation module (LEM) that comprises a probabilistic model (PM) for a plurality of sample points, each of which comprises a sample location and an expected distribution of signal values at that sample point. The location estimation module (LEM) makes a sequence (OS) of observations o, n=1, 2, 3 . . . , of signal values. Each observation corresponds to a respective location qalong the target device's path. The sequence of observations and the respective location constitute a hidden Markov model. The module estimates the target device's location qbased on the probabilistic model (PM) and the sequence of observations, wherein the sequence of observations comprises one or more future observations ofor which m is a positive integer. In other words, the target device's location is estimated, at least partially, based on knowledge of its future.