Patents by Inventor Takamasa Kawaguchi
Takamasa Kawaguchi 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: 20240118434Abstract: A positioning apparatus (100) detects pseudo ranges and carrier phase integrated values from ranging signals (L1C/A) for which augmentation information ([LC/A]) is provided, detects pseudo ranges and carrier phase integrated values from ranging signals (B1C) for which augmentation information is not provided, acquires correction data ([LC/A]) for the ranging signals generated from the augmentation information, corrects the pseudo ranges and the carrier phase integrated values of the ranging signals (L1C/A) with the correction data ([LC/A]), generates a first observation equation using the corrected pseudo ranges and carrier phase integrated values of the ranging signals (L1C/A), generates a second observation equation using a time difference value between the pseudo ranges and a time difference value between the carrier phase integrated values of the ranging signals (B1C), and performs positioning by executing a filter operation using the first observation equation and the second observation equation.Type: ApplicationFiled: October 4, 2021Publication date: April 11, 2024Applicant: Mitsubishi Electric CorporationInventors: Norizumi MOTOOKA, Takamasa KAWAGUCHI, Masayasu FUJITA, Yuki SATO
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Patent number: 11789162Abstract: A first bias conversion unit converts, based on a first frequency and a second frequency, a signal bias related to carrier phase for correcting a carrier phase contained in a first ranging signal having the first frequency, to a signal bias related to carrier phase for correcting a carrier phase contained in a second ranging signal having the second frequency. A first correction unit corrects the carrier phase using the converted signal bias. A second bias conversion unit converts the signal bias related to pseudorange to the signal bias related to pseudorange by making reference to a conversion table indicating values for use in conversion of the signal bias related to pseudorange to the signal bias related to pseudorange. A second correction unit corrects a pseudorange using the converted signal bias.Type: GrantFiled: October 16, 2020Date of Patent: October 17, 2023Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Norizumi Motooka, Yuki Sato, Takamasa Kawaguchi, Yuichi Hagito, Masayasu Fujita
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Publication number: 20220381924Abstract: A first bias conversion unit converts, based on a first frequency and a second frequency, a signal bias related to carrier phase for correcting a carrier phase contained in a first ranging signal having the first frequency, to a signal bias related to carrier phase for correcting a carrier phase contained in a second ranging signal having the second frequency. A first correction unit corrects the carrier phase using the converted signal bias. A second bias conversion unit converts the signal bias related to pseudorange to the signal bias related to pseudorange by making reference to a conversion table indicating values for use in conversion of the signal bias related to pseudorange to the signal bias related to pseudorange. A second correction unit corrects a pseudorange using the converted signal bias.Type: ApplicationFiled: October 16, 2020Publication date: December 1, 2022Applicant: Mitsubishi Electric CorporationInventors: Norizumi MOTOOKA, Yuki SATO, Takamasa KAWAGUCHI, Yuichi HAGITO, Masayasu FUJITA
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Publication number: 20210026970Abstract: The present invention provides a security evaluation server including: a hierarchy generation unit configured to generate information regarding a plurality of system hierarchies in an evaluation subject system; an evaluation unit configured to, based on the information regarding the plurality of system hierarchies generated by the hierarchy generation unit, calculate an evaluation value of protection effectiveness based on a security function requirement included in each of the plurality of system hierarchies in the evaluation subject system, and calculate an evaluation value of protection effectiveness based on a combination of the security function requirements; and a verification unit configured to verify whether each of the security function requirements in the evaluation subject system is in excess or insufficient, based on each of the evaluation values calculated by the evaluation unit and a target value.Type: ApplicationFiled: December 13, 2018Publication date: January 28, 2021Applicant: HITACHI, LTD.Inventors: Yiwen CHEN, Satoshi KAI, Eriko ANDO, Hiroshi MINE, Satoshi IIMURO, Takamasa KAWAGUCHI
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Patent number: 9310489Abstract: The present invention provides a transmitter comprising: a plurality of antennas; and a radio transmitting part transmitting from each of the antennas a positional information signal containing the same positional information, the positional information being transmitted from the antennas through channels which are different between the antennas. The transmitter enables prevention of the positioning error and the positioning time from increasing by solving problems of null points and signal interferences, problems relating to a positional information transmitter disposed indoors, in a positioning system for acquiring a current position both indoors and outdoors.Type: GrantFiled: July 13, 2010Date of Patent: April 12, 2016Assignee: Hitachi, Ltd.Inventors: Takamasa Kawaguchi, Tomoichi Ebata, Takayoshi Fujioka
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Patent number: 8773309Abstract: The present invention provides a positional information transmitter, a positional information receiver and a position measuring system capable of measuring a position under moving circumstances. The positional information transmitter transmits positional information for specifying the current position.Type: GrantFiled: February 2, 2011Date of Patent: July 8, 2014Assignee: Hitachi, Ltd.Inventors: Takamasa Kawaguchi, Tomoichi Ebata, Takayoshi Fujioka
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Patent number: 8432311Abstract: A GPS signal transmitter configured with a reduced number of components and achieving low cost, space saving, and low power is provided. A GPS signal transmitter of the present invention includes: a crystal oscillator; a carrier wave generator that outputs a first carrier wave and a second carrier wave whose phase is inverted to the phase of the first carrier wave, using a clock output by the crystal oscillator; a microcomputer that is driven with the clock output by the crystal oscillator and outputs a control signal based on a C/A code which is a pseudo random code; a switch that switches over between the first carrier wave and the second carrier wave according to the control signal from the microcomputer and generates a modulation wave; and an antenna that transmits the modulation wave by radio.Type: GrantFiled: December 31, 2009Date of Patent: April 30, 2013Assignee: Hitachi, Ltd.Inventors: Tomoichi Ebata, Takayoshi Fujioka, Takamasa Kawaguchi, Shinya Yoshihara
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Patent number: 8299965Abstract: A position information transmitter including: a digital processing device including a CPU and a position information database storing position information of the position information transmitter and information of channels used by other position information transmitters; and a radio transmitting device executing a signal modulation, wherein the digital processing device generates spread spectrum signals from the position information of the position information transmitter and information of channels used by other position information transmitters, by using the C/A code, and the radio transmitting device modulates the spread spectrum signals and transmits modulated signals as a radio signals.Type: GrantFiled: August 9, 2011Date of Patent: October 30, 2012Assignee: Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Takamasa Kawaguchi, Tomoichi Ebata, Yutaka Shimogaki, Hitoshi Ogasawara
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Publication number: 20120194383Abstract: The present invention provides a transmitter comprising: a plurality of antennas; and a radio transmitting part transmitting from each of the antennas a positional information signal containing the same positional information, the positional information being transmitted from the antennas through channels which are different between the antennas. The transmitter enables prevention of the positioning error and the positioning time from increasing by solving problems of null points and signal interferences, problems relating to a positional information transmitter disposed indoors, in a positioning system for acquiring a current position both indoors and outdoors.Type: ApplicationFiled: July 13, 2010Publication date: August 2, 2012Inventors: Takamasa Kawaguchi, Tomoichi Ebata, Takayoshi Fujioka
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Publication number: 20110291883Abstract: A position information transmitter including: a digital processing device including a CPU and a position information database storing position information of the position information transmitter and information of channels used by other position information transmitters; and a radio transmitting device executing a signal modulation, wherein the digital processing device generates spread spectrum signals from the position information of the position information transmitter and information of channels used by other position information transmitters, by using the C/A code, and the radio transmitting device modulates the spread spectrum signals and transmits modulated signals as a radio signals.Type: ApplicationFiled: August 9, 2011Publication date: December 1, 2011Inventors: Takamasa KAWAGUCHI, Tomoichi EBATA, Yutaka SHIMOGAKI, Hitoshi OGASAWARA
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Publication number: 20110260915Abstract: The present invention provides a positional information transmitter, a positional information receiver and a position measuring system capable of measuring a position under moving circumstances. The positional information transmitter transmits positional information for specifying the current position.Type: ApplicationFiled: February 2, 2011Publication date: October 27, 2011Inventors: Takamasa KAWAGUCHI, Tomoichi Ebata, Takayoshi Fujioka
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Patent number: 7994970Abstract: In a positioning system comprising a position information transmitter that transmits a position information signal containing position information indicative of a position as a signal compatible with a satellite positioning signal transmitted from an artificial satellite and a communication terminal that when receiving the satellite positioning signal, finds a current position of the communication terminal by finding a position of the artificial satellite and that when receiving the position information signal, finds a current position of the communication terminal based on the position information, the position information transmitter transmits the position information signal containing a boundary flag that determines which of the satellite positioning signal or the position information signal each of correlators of the communication terminal is to receive, and the communication terminal sets which of the satellite positioning signal or the position information signal each of the correlators is to receive baType: GrantFiled: February 27, 2009Date of Patent: August 9, 2011Assignee: Hitachi, Ltd.Inventors: Takamasa Kawaguchi, Tomoichi Ebata, Yutaka Shimogaki, Hitoshi Ogasawara
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Publication number: 20100194636Abstract: A GPS signal transmitter configured with a reduced number of components and achieving low cost, space saving, and low power is provided. A GPS signal transmitter of the present invention includes: a crystal oscillator; a carrier wave generator that outputs a first carrier wave and a second carrier wave whose phase is inverted to the phase of the first carrier wave, using a clock output by the crystal oscillator; a microcomputer that is driven with the clock output by the crystal oscillator and outputs a control signal based on a C/A code which is a pseudo random code; a switch that switches over between the first carrier wave and the second carrier wave according to the control signal from the microcomputer and generates a modulation wave; and an antenna that transmits the modulation wave by radio.Type: ApplicationFiled: December 31, 2009Publication date: August 5, 2010Applicant: HITACHI, LTD.Inventors: Tomoichi EBATA, Takayoshi FUJIOKA, Takamasa KAWAGUCHI, Shinya YOSHIHARA
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Patent number: 7664066Abstract: A wireless device according to the present invention minimizes the need for changing a communication route in an ad hoc network including wireless devices used for base stations, fixed stations, and mobile stations that are turned on/off or moved, wherein, when wireless devices cannot directly send or receive radio waves, data can be transmitted between them by relaying data via other wireless devices that can directly send or receive radio waves (multi-hopping). In selecting a communication route, a communication route that includes wireless devices that are turned off or moved least frequently is selected.Type: GrantFiled: December 1, 2004Date of Patent: February 16, 2010Assignee: Hitachi, Ltd.Inventors: Takamasa Kawaguchi, Nobuyoshi Ando, Takayoshi Fujioka
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Publication number: 20090256742Abstract: In a positioning system comprising a position information transmitter that transmits a position information signal containing position information indicative of a position as a signal compatible with a satellite positioning signal transmitted from an artificial satellite and a communication terminal that when receiving the satellite positioning signal, finds a current position of the communication terminal by finding a position of the artificial satellite and that when receiving the position information signal, finds a current position of the communication terminal based on the position information, the position information transmitter transmits the position information signal containing a boundary flag that determines which of the satellite positioning signal or the position information signal each of correlators of the communication terminal is to receive, and the communication terminal sets which of the satellite positioning signal or the position information signal each of the correlators is to receive baType: ApplicationFiled: February 27, 2009Publication date: October 15, 2009Inventors: Takamasa Kawaguchi, Tomoichi Ebata, Yutaka Shimogaki, Hitoshi Ogasawara
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Publication number: 20060002366Abstract: A wireless device according to the present invention minimizes the need for changing a communication route in an ad hoc network including wireless devices used for base stations, fixed stations, and mobile stations that are turned on/off or moved, wherein, when wireless devices cannot directly send or receive radio waves, data can be transmitted between them by relaying data via other wireless devices that can directly send or receive radio waves (multi-hopping). In selecting a communication route, a communication route that includes wireless devices that are turned off or moved least frequently is selected.Type: ApplicationFiled: December 1, 2004Publication date: January 5, 2006Inventors: Takamasa Kawaguchi, Nobuyoshi Ando, Takayoshi Fujioka