Patents by Inventor Yoshiyuki Muraguchi
Yoshiyuki Muraguchi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20150127126Abstract: A determination unit determines a first direction appearing in the distribution of a detected acceleration by an acceleration sensor which configured to be worn on a body of a user. A calculation unit calculates exercise amounts during a moving exercise of the user using a variation cycle of the value of the detected acceleration along the first direction.Type: ApplicationFiled: October 31, 2014Publication date: May 7, 2015Inventors: Yoshitaka YAMAGATA, Yoshiyuki MURAGUCHI, Hiroyuki ISOGAI, Tomoya KAWAMOTO, Tatsuhiko SUGIYAMA, Naoki GOBARA
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Patent number: 8339310Abstract: A positioning method includes: executing a first positioning mode or a second positioning mode, a first positioning process that is performed using a least-square method based on a positioning signal and a second positioning process that is performed using a Kalman filter based on the positioning signal utilizing a positioning result obtained by the first positioning process as a base value being performed in the first positioning mode, and the second positioning process being further performed in the second positioning mode utilizing a positioning result obtained by the second positioning process as a base value; determining accuracy of a positioning result obtained by the second positioning process performed in the executed positioning mode; and changing the positioning mode to be executed to the first positioning mode or the second positioning mode corresponding to the accuracy.Type: GrantFiled: July 8, 2010Date of Patent: December 25, 2012Assignee: Seiko Epson CorporationInventors: Shunichi Mizuochi, Yoshiyuki Muraguchi, Koichiro Yano
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Patent number: 8085197Abstract: A position calculating method includes: executing position calculation processing using a plurality of Kalman filter processing, which is processing corresponding to each of a plurality of power spectral density groups classified by performing in advance frequency analysis on the movement acceleration of a movable body as an object of position calculation and which includes an error parameter set to a different value according to the power spectral density group and a parameter indicating that the movable body is in a uniform motion state, on the basis of a satellite signal from a positioning satellite; and determining the position of the movable body using a position calculated by each Kalman filter processing.Type: GrantFiled: December 9, 2009Date of Patent: December 27, 2011Assignee: Seiko Epson CorporationInventors: Kumar Anand, Yoshiyuki Muraguchi
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Patent number: 7961146Abstract: A positioning method in a positioning device that calculates a location of the positioning device by executing Kalman filtering includes, acquiring a satellite signal from a positioning satellite; predicting a state vector including a velocity component of the positioning device, and error covariance of the state vector; correcting the velocity component using a difference between a measured value and a predicted value of the reception signal frequency from the positioning satellite; determining accuracy of the corrected velocity component based on the error covariance; setting a velocity condition based on the determined accuracy; judging a moving state of the positioning device by comparing the corrected velocity component and the velocity condition; and calculating the location by executing the Kalman filtering with a filter characteristic changed according to the judged moving state.Type: GrantFiled: December 18, 2008Date of Patent: June 14, 2011Assignee: Seiko Epson CorporationInventor: Yoshiyuki Muraguchi
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Publication number: 20100280780Abstract: A positioning method includes: executing a first positioning mode or a second positioning mode, a first positioning process that is performed using a least-square method based on a positioning signal and a second positioning process that is performed using a Kalman filter based on the positioning signal utilizing a positioning result obtained by the first positioning process as a base value being performed in the first positioning mode, and the second positioning process being further performed in the second positioning mode utilizing a positioning result obtained by the second positioning process as a base value; determining accuracy of a positioning result obtained by the second positioning process performed in the executed positioning mode; and changing the positioning mode to be executed to the first positioning mode or the second positioning mode corresponding to the accuracy.Type: ApplicationFiled: July 8, 2010Publication date: November 4, 2010Applicant: SEIKO EPSON CORPORATIONInventors: Shunichi MIZUOCHI, Yoshiyuki MURAGUCHI, Koichiro YANO
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Patent number: 7777673Abstract: A positioning method includes: executing a first positioning mode or a second positioning mode, a first positioning process that is performed using a least-square method based on a positioning signal and a second positioning process that is performed using a Kalman filter based on the positioning signal utilizing a positioning result obtained by the first positioning process as a base value being performed in the first positioning mode, and the second positioning process being further performed in the second positioning mode utilizing a positioning result obtained by the second positioning process as a base value; determining accuracy of a positioning result obtained by the second positioning process performed in the executed positioning mode; and changing the positioning mode to be executed to the first positioning mode or the second positioning mode corresponding to the accuracy.Type: GrantFiled: November 26, 2008Date of Patent: August 17, 2010Assignee: Seiko Epson CorporationInventors: Shunichi Mizuochi, Yoshiyuki Muraguchi, Koichiro Yano
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Publication number: 20100188284Abstract: A position calculating method includes: executing position calculation processing using a plurality of Kalman filter processing, which is processing corresponding to each of a plurality of power spectral density groups classified by performing in advance frequency analysis on the movement acceleration of a movable body as an object of position calculation and which includes an error parameter set to a different value according to the power spectral density group and a parameter indicating that the movable body is in a uniform motion state, on the basis of a satellite signal from a positioning satellite; and determining the position of the movable body using a position calculated by each Kalman filter processing.Type: ApplicationFiled: December 9, 2009Publication date: July 29, 2010Applicant: SEIKO EPSON CORPORATIONInventors: Kumar ANAND, Yoshiyuki MURAGUCHI
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Publication number: 20090273516Abstract: A positioning device includes an estimated height storage section which stores an estimated height H1, a signal reception section which receives a satellite signal which is a signal from a satellite positioning system (SPS) satellite, a two-dimensional height calculation section which calculates a two-dimensional height H2c by two-dimensional positioning using the estimated height H1, a three-dimensional height calculation section which calculates a three-dimensional height H2b by preliminary three-dimensional positioning during two-dimensional positioning, a height selection section which selects the two-dimensional height H2b or the three-dimensional height H2c in order to update the estimated height H1, and an updating section which updates the estimated height H1 with the two-dimensional height H2b or the three-dimensional height H2c selected by the height selection section.Type: ApplicationFiled: June 3, 2009Publication date: November 5, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Shunichi MIZUOCHI, Yoshiyuki MURAGUCHI
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Patent number: 7557750Abstract: A positioning device includes an estimated height storage section which stores an estimated height H1, a signal reception section which receives a satellite signal which is a signal from a satellite positioning system (SPS) satellite, a two-dimensional height calculation section which calculates a two-dimensional height H2c by two-dimensional positioning using the estimated height H1, a three-dimensional height calculation section which calculates a three-dimensional height H2b by preliminary three-dimensional positioning during two-dimensional positioning, a height selection section which selects the two-dimensional height H2b or the three-dimensional height H2c in order to update the estimated height H1, and an updating section which updates the estimated height H1 with the two-dimensional height H2b or the three-dimensional height H2c selected by the height selection section.Type: GrantFiled: August 3, 2007Date of Patent: July 7, 2009Assignee: Seiko Epson CorporationInventors: Shunichi Mizuochi, Yoshiyuki Muraguchi
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Publication number: 20090167603Abstract: A positioning method in a positioning device that calculates a location of the positioning device by executing Kalman filtering includes, acquiring a satellite signal from a positioning satellite; predicting a state vector including a velocity component of the positioning device, and error covariance of the state vector; correcting the velocity component using a difference between a measured value and a predicted value of the reception signal frequency from the positioning satellite; determining accuracy of the corrected velocity component based on the error covariance; setting a velocity condition based on the determined accuracy; judging a moving state of the positioning device by comparing the corrected velocity component and the velocity condition; and calculating the location by executing the Kalman filtering with a filter characteristic changed according to the judged moving state.Type: ApplicationFiled: December 18, 2008Publication date: July 2, 2009Applicant: SEIKO EPSON CORPORATIONInventor: Yoshiyuki Muraguchi
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Publication number: 20090140924Abstract: A positioning method includes: executing a first positioning mode or a second positioning mode, a first positioning process that is performed using a least-square method based on a positioning signal and a second positioning process that is performed using a Kalman filter based on the positioning signal utilizing a positioning result obtained by the first positioning process as a base value being performed in the first positioning mode, and the second positioning process being further performed in the second positioning mode utilizing a positioning result obtained by the second positioning process as a base value; determining accuracy of a positioning result obtained by the second positioning process performed in the executed positioning mode; and changing the positioning mode to be executed to the first positioning mode or the second positioning mode corresponding to the accuracy.Type: ApplicationFiled: November 26, 2008Publication date: June 4, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Shunichi MIZUOCHI, Yoshiyuki MURAGUCHI, Koichiro YANO
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Publication number: 20080051999Abstract: A positioning device includes an estimated height storage section which stores an estimated height H1, a signal reception section which receives a satellite signal which is a signal from a satellite positioning system (SPS) satellite, a two-dimensional height calculation section which calculates a two-dimensional height H2c by two-dimensional positioning using the estimated height H1, a three-dimensional height calculation section which calculates a three-dimensional height H2b by preliminary three-dimensional positioning during two-dimensional positioning, a height selection section which selects the two-dimensional height H2b or the three-dimensional height H2c in order to update the estimated height H1, and an updating section which updates the estimated height H1 with the two-dimensional height H2b or the three-dimensional height H2c selected by the height selection section.Type: ApplicationFiled: August 3, 2007Publication date: February 28, 2008Applicant: Seiko Epson CorporationInventors: Shunichi Mizuochi, Yoshiyuki Muraguchi