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. 20, 2012
Filed:
Oct. 24, 2008
Shohei Hido, Yokohama, JP;
Tsuyoshi Ide, Kawasaki, JP;
Hisashi Kashima, Yokohama, JP;
Shoko Suzuki, Kawasaki, JP;
Akira Tajima, Tokyo-to, JP;
Rikiya Takahashi, Yokohama, JP;
Toshihiro Takahashi, Yamato, JP;
Yuta Tsuboi, Yamato, JP;
Shohei Hido, Yokohama, JP;
Tsuyoshi Ide, Kawasaki, JP;
Hisashi Kashima, Yokohama, JP;
Shoko Suzuki, Kawasaki, JP;
Akira Tajima, Tokyo-to, JP;
Rikiya Takahashi, Yokohama, JP;
Toshihiro Takahashi, Yamato, JP;
Yuta Tsuboi, Yamato, JP;
International Busines Machines Corporation, Armonk, NY (US);
Abstract
A location estimation method using label propagation. The achieved location estimation method is robust to variations in radio signal strengths and is highly accurate by using the q-norm (0<q<1), especially, for calculating the similarities among radio signal strength vectors. The accuracy in location estimation is further improved by putting more importance on the time-series similarities. Specifically, the time-series similarity is calculated by using time-series values indicating the temporal order of radio signal strengths during the measurement. If the time-series similarity is larger than the similarity between the radio signal strength vectors, the time-series similarity is preferentially used. The exponential attenuation function can also be used for calculating the similarities, instead of the q norm (0<q<1).