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:
Aug. 29, 2000
Filed:
Jul. 14, 1998
Mati Wax, San Ramon, CA (US);
Oliver Hilsenrath, Alamo, CA (US);
US Wireless Corporation, San Ramon, CA (US);
Abstract
A method and apparatus for wireless location finding determines a set of likely locations from a signal covariance matrix R, a set of array calibration vectors {a(.theta.)}, and a set of calibrated signal covariance matrices {R.sub.k } corresponding to calibrated locations. From these quantities, an angular energy distribution function B(.theta.) is calculated from R and a(.theta.), and compared to a set of calibrated angular energy distribution functions B.sub.1 (.theta.), . . . , B.sub.N (.theta.) corresponding to the set of calibrated signal covariance matrices R.sub.1, . . . , R.sub.N. The function B(.theta.) is then compared with each of the calibrated functions B.sub.1 (.theta.), . . . , B.sub.N (.theta.) to determine those calibrated functions that most closely match the calculated function B(.theta.). From these calculations a set of likely locations is then determined.