[특허]Efficient storage and fast matching of wireless spatial signatures

[미국특허] Efficient storage and fast matching of wireless spatial signatures 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-003/16 G01S-003/02
출원번호	US-0275655 (1999-03-24)
발명자 / 주소	Wax Mati Jayaraman Sriram Radionov Vladimir Lebedev Gennadi Hilsenrath Oliver
출원인 / 주소	US Wireless Corporation
대리인 / 주소	Lumen Intellectual Property Services
인용정보	피인용 횟수 : 66 인용 특허 : 2

초록 ▼

A method for determining a geographical location from a measured wireless signal signature comprises calculating from the measured wireless signal signature a multi-dimensional signature vector, wherein each component of the vector measures a degree of coincidence between the measured wireless signal signature and a calibrated signal signature stored in a calibration table. The method also includes matching the signature vector with vectors in a set of multi-dimensional calibrated vectors. The matching uses a procedure comprising searching a hierarchical tree structure and eliminating nodes that cannot contain the best match vector. Within the remaining nodes, the search eliminates individual vectors that cannot be the best match vector, and selects one or more vectors in the set of multi-dimensional calibrated vectors, where the matched vectors correspond to calibrated geographical locations.

대표청구항 ▼

[ What is claimed is:] [1.] In a wireless location finding system, a computer-implemented method for determining a geographical location from a measured wireless signal signature, the method comprising:calculating from the measured wireless signal signature a multi-dimensional vector v, wherein each component of v measures a degree of coincidence between the measured wireless signal signature and a calibrated signal signature stored in a calibration table;matching v with matched vectors in a set of multi-dimensional calibrated vectors v.sub.1, . . . , v.sub.N, using a procedure comprising searching a hierarchical tree structure containing the calibrated vectors v.sub.1, . . . , v.sub.N, and selecting the matched vectors from leaf nodes in the tree, where the matched vectors correspond to calibrated geographical locations.

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[미국특허] Efficient storage and fast matching of wireless spatial signatures 원문보기