Patents by Inventor Seiichiro Hirata
Seiichiro Hirata 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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Patent number: 8912949Abstract: It is an object of the present invention to provide a system with which 3-dimensional position can be accurately measured. Plural UWB transmitter-receivers (1), periodically transmitting PN codes of M system and preliminarily disposed on known positions are provided, a server (3) to synchronize the plural UWB transmitter-receivers (1) is provided, an RF tag (T), attached to a moving object (20) as to receive signals (I0) synchronously and periodically transmitted from the UWB transmitter-receivers (1) and reflect the signals (I0) adding inherent tag recognition signal, is provided, and the UWB transmitter-receiver (1) is composed as to obtain the distance to the moving object (20) attached with the RF tag (T) by synchronous summation and correlative calculation of the PN codes of M system reflected by the RF tag (T).Type: GrantFiled: April 26, 2010Date of Patent: December 16, 2014Assignees: The University of Electro-Communications, Git Japan Incorporated, Sensorcomm Co., Ltd.Inventors: Seiichiro Hirata, Nobuo Nakajima, Shogo Ida, Harumasa Hojo
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Publication number: 20120176272Abstract: It is an object of the present invention to provide a system with which 3-dimensional position can be accurately measured. Plural UWB transmitter-receivers (1), periodically transmitting PN codes of M system and preliminarily disposed on known positions are provided, a server (3) to synchronize the plural UWB transmitter-receivers (1) is provided, an RF tag (T), attached to a moving object (20) as to receive signals (I0) synchronously and periodically transmitted from the UWB transmitter-receivers (1) and reflect the signals (I0) adding inherent tag recognition signal, is provided, and the UWB transmitter-receiver (1) is composed as to obtain the distance to the moving object (20) attached with the RF tag (T) by synchronous summation and correlative calculation of the PN codes of M system reflected by the RF tag (T).Type: ApplicationFiled: April 26, 2010Publication date: July 12, 2012Inventors: Seiichiro Hirata, Nobuo Nakajima, Shogo Ida, Harumasa Hojo
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Patent number: 7999732Abstract: A receiver terminal receives a frequency from an external reference oscillator portion, which is more accurate than that of a frequency generated within the receiver in a local oscillator portion. The frequency from the local oscillator portion is measured using the external frequency as the reference, which determines the error in the local oscillator frequency relative to the external reference and permits the local oscillator frequency to be corrected to within the error of the external oscillator frequency. A plurality of candidate values for the remaining local frequency error are selected within a predetermined frequency range to include any remaining error of the local oscillator frequency. The received signal from a satellite is correlated with a matching pseudorandom code to detect the signal and measure the signal delay and Doppler shift of the signal relative to the corrected local oscillator frequency.Type: GrantFiled: October 30, 2008Date of Patent: August 16, 2011Inventors: Nobuhiro Kishimoto, Seiichiro Hirata
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Patent number: 7764227Abstract: A positioning apparatus includes a correlator 30 for calculating a correlation between the pseudo pattern code of each of satellites 1 and 2 and each of SPS signals associated with the satellites 1 and 2, and for outputting a correlation value indicating the correlation, sets up effective ranges ?1 and ?2 for the correlation values outputted from the correlator 30 on the basis of a pseudo distance PR1 between the satellite 1 and a SPS reference station 4, and a pseudo distance PR2 between the satellite 2 and the SPS reference station 4, and detects peak values which fall within the effective ranges ?1 and ?2, respectively. As a result, the positioning apparatus can determine the current position correctly even under a receiving environment in which the electric waves directly from the satellites 1 and 2 may become weak.Type: GrantFiled: February 18, 2005Date of Patent: July 27, 2010Assignees: Mitsubishi Electric Corporation, Magellan Systems Japan, Inc.Inventors: Takayoshi Nakamoto, Fumio Ueda, Seiichiro Hirata
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Publication number: 20090289841Abstract: A positioning apparatus includes a correlator 30 for calculating a correlation between the pseudo pattern code of each of satellites 1 and 2 and each of SPS signals associated with the satellites 1 and 2, and for outputting a correlation value indicating the correlation, sets up effective ranges ?1 and ?2 for the correlation values outputted from the correlator 30 on the basis of a pseudo distance PR1 between the satellite 1 and a SPS reference station 4, and a pseudo distance PR2 between the satellite 2 and the SPS reference station 4, and detects peak values which fall within the effective ranges ?1 and ?2, respectively. As a result, the positioning apparatus can determine the current position correctly even under a receiving environment in which the electric waves directly from the satellites 1 and 2 may become weak.Type: ApplicationFiled: February 18, 2005Publication date: November 26, 2009Applicants: Mitsubishi Electric Corporation, Magellan Systems Japan, Inc.Inventors: Takayoshi Nakamoto, Fumio Ueda, Seiichiro Hirata
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Patent number: 7528771Abstract: A receiver terminal receives a frequency from an external reference oscillator portion, which is more accurate than that of a frequency generated within the receiver in a local oscillator portion. The frequency from the local oscillator portion is measured using the external frequency as the reference, which determines the error in the local oscillator frequency relative to the external reference and permits the local oscillator frequency to be corrected to within the error of the external oscillator frequency. A plurality of candidate values for the remaining local frequency error are selected within a predetermined frequency range to include any remaining error of the local oscillator frequency. The received signal from a satellite is correlated with a matching pseudorandom code to detect the signal and measure the signal delay and Doppler shift of the signal relative to the corrected local oscillator frequency.Type: GrantFiled: May 1, 2007Date of Patent: May 5, 2009Inventors: Nobuhiro Kishimoto, Seiichiro Hirata
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Publication number: 20090066566Abstract: A receiver terminal receives a frequency from an external reference oscillator portion, which is more accurate than that of a frequency generated within the receiver in a local oscillator portion. The frequency from the local oscillator portion is measured using the external frequency as the reference, which determines the error in the local oscillator frequency relative to the external reference and permits the local oscillator frequency to be corrected to within the error of the external oscillator frequency. A plurality of candidate values for the remaining local frequency error are selected within a predetermined frequency range to include any remaining error of the local oscillator frequency. The received signal from a satellite is correlated with a matching pseudorandom code to detect the signal and measure the signal delay and Doppler shift of the signal relative to the corrected local oscillator frequency.Type: ApplicationFiled: October 30, 2008Publication date: March 12, 2009Applicants: Nobuhiro KISHIMOTO, Seiichiro HIRATAInventors: Nobuhiro Kishimoto, Seiichiro Hirata
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Publication number: 20080272960Abstract: A receiver terminal receives a frequency from an external reference oscillator portion, which is more accurate than that of a frequency generated within the receiver in a local oscillator portion. The frequency from the local oscillator portion is measured using the external frequency as the reference, which determines the error in the local oscillator frequency relative to the external reference and permits the local oscillator frequency to be corrected to within the error of the external oscillator frequency. A plurality of candidate values for the remaining local frequency error are selected within a predetermined frequency range to include any remaining error of the local oscillator frequency. The received signal from a satellite is correlated with a matching pseudorandom code to detect the signal and measure the signal delay and Doppler shift of the signal relative to the corrected local oscillator frequency.Type: ApplicationFiled: May 1, 2007Publication date: November 6, 2008Inventors: Nobuhiro Kishimoto, Seiichiro Hirata
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Patent number: 7408504Abstract: A GPS positioning method to obtain pseudorange between a receiver terminal and a satellite by capturing a portion of received satellite signals of a predetermined time duration. A predetermined number of first input signals, equivalent to 1-bit of navigation data, are obtained with various delays in the starting point of processing. The first input signals are synchronously summed up to obtain second input signals. A PN code replica (pseudopattern) prepared by the receiver terminal operates on the second input signals to detect the polarity of the navigation bits and correct the polarity of the bits so that the bit polarity of the second input signals are always positive.Type: GrantFiled: September 3, 2004Date of Patent: August 5, 2008Assignee: Magellan Systems Japan Inc.Inventors: Nobuhiro Kishimoto, Seiichiro Hirata
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Publication number: 20060014907Abstract: Disclosed is a coating composition for a tendon for prestressed concrete; wherein being applied on the surface of the tendon for a tendon for prestressed concrete; comprising oxidation-curing type resin modified with fatty acid, and metal catalyst to promote the curing of the resin; and curing time thereof is adjusted so that tensioning by the tendon can be exerted 30 days or later after casting of the concrete. The coating composition can be used safely almost without cutaneous stimulation, and enable effective tensioning even after hardening of the concrete when applied to massive concrete structure. Further, the coating composition exhibits excellent storage stability.Type: ApplicationFiled: June 3, 2003Publication date: January 19, 2006Inventors: Seiichiro Hirata, Shoji Shirahama, Toshio Kobayashi, Ichirou Aoyama
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Publication number: 20050171302Abstract: Disclosed is a coating composition for PC tendon, which is applied on surface of the PC tendon. This composition includes epoxy resin, multifunctional isocyanate compound, calcium oxide and water, and further includes water-absorbing polymer as necessary. A curing time thereof is adjusted so that tensioning by the PC tendon can be exerted 30 days or later after casting of the concrete. Accordingly, even when applied to a massive concrete structure, the coating composition enables effective tensioning after hardening of the concrete, while exhibiting excellent storage stability.Type: ApplicationFiled: May 9, 2003Publication date: August 4, 2005Inventors: Seiichiro Hirata, Shoji Shirahama, Toshio Kobayashi, Ichirou Aoyama
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Publication number: 20050116860Abstract: A GPS positioning method to obtain pseudorange between a receiver terminal and a satellite by capturing a portion of received satellite signals of a predetermined time duration. A predetermined number of first input signals, equivalent to 1-bit of navigation data, are obtained with various delays in the starting point of processing. The first input signals are synchronously summed up to obtain second input signals. A PN code replica (pseudopattern) prepared by the receiver terminal operates on the second input signals to detect the polarity of the navigation bits and correct the polarity of the bits so that the bit polarity of the second input signals are always positive.Type: ApplicationFiled: September 3, 2004Publication date: June 2, 2005Inventors: Nobuhiro Kishimoto, Seiichiro Hirata
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Patent number: 6674402Abstract: A Global Positioning System carries out Doppler correction of a C/A code sequence after a frequency conversion, and calculates a pseudo range by performing correlation calculation between the C/A code, which is obtained by summing up the C/A code sequence beginning from a polarity inversion boundary determined at a correlation peak detecting step ST10, and a C/A code generated in a GPS terminal. When a received electric field detected by a received electric field intensity detector 11 is good, the current position is determined from the pseudo range and the navigation data extracted by the GPS terminal itself, whereas when the received electric field is poor, the current position is determined from the pseudo range and the navigation data sent from an external apparatus.Type: GrantFiled: October 7, 2002Date of Patent: January 6, 2004Assignees: Mitsubishi Denki Kabushiki Kaisha, Magellan Corporation, Magellan Systems Japan Inc.Inventors: Seiichiro Hirata, Sergy V. Lyusin
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Publication number: 20030030584Abstract: A Global Positioning System carries out Doppler correction of a C/A code sequence after a frequency conversion, and calculates a pseudo range by performing correlation calculation between the C/A code, which is obtained by summing up the C/A code sequence beginning from a polarity inversion boundary determined at a correlation peak detecting step ST10, and a C/A code generated in a GPS terminal. When a received electric field detected by a received electric field intensity detector 11 is good, the current position is determined from the pseudo range and the navigation data extracted by the GPS terminal itself, whereas when the received electric field is poor, the current position is determined from the pseudo range and the navigation data sent from an external apparatus.Type: ApplicationFiled: October 7, 2002Publication date: February 13, 2003Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Seiichiro Hirata, Sergy V. Lyusin
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Patent number: 6483457Abstract: A Global Positioning System carries out Doppler correction of a C/A code sequence after a frequency conversion, and calculates a pseudo range by performing correlation calculation between the C/A code, which is obtained by summing up the C/A code sequence beginning from a polarity inversion boundary determined at a correlation peak detecting step ST10, and a C/A code generated in a GPS terminal. When a received electric field detected by a received electric field intensity detector 11 is good, the current position is determined from the pseudo range and the navigation data extracted by the GPS terminal itself, whereas when the received electric field is poor, the current position is determined from the pseudo range and the navigation data sent from an external apparatus.Type: GrantFiled: September 13, 2001Date of Patent: November 19, 2002Assignees: Mitsubishi Denki Kabushiki Kaisha, Magellan Corporation, Magellan Systems Japan, Inc.Inventors: Seiichiro Hirata, Sergy V. Lyusin
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Patent number: 6437736Abstract: A Global Positioning System forms a C/A code sequence by summing up, beginning from a polarity inversion boundary determined by a correlation peak position detector, chips at corresponding positions in PN frames constituting each bit of navigation data; calculates pseudo ranges by computing correlation between the C/A code sequence and a reference C/A code sequence generated by a GPS terminal; and determines the position of the GPS terminal using the pseudo ranges and navigation data. The navigation data detected inside the GPS terminal is used when a received electric field detected by a received electric field intensity detector is greater than a predetermined level, and the navigation data received from an external system is used when the received electric field is below the predetermined level.Type: GrantFiled: May 9, 2001Date of Patent: August 20, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Fumio Ueda, Seiichiro Hirata
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Publication number: 20020093452Abstract: A Global Positioning System carries out Doppler correction of a C/A code sequence after a frequency conversion, and calculates a pseudo range by performing correlation calculation between the C/A code, which is obtained by summing up the C/A code sequence beginning from a polarity inversion boundary determined at a correlation peak detecting step ST10, and a C/A code generated in a GPS terminal. When a received electric field detected by a received electric field intensity detector 11 is good, the current position is determined from the pseudo range and the navigation data extracted by the GPS terminal itself, whereas when the received electric field is poor, the current position is determined from the pseudo range and the navigation data sent from an external apparatus.Type: ApplicationFiled: September 13, 2001Publication date: July 18, 2002Applicant: Mitsubishi Denki Kabushiki Kaisha/Magellan CorporationInventors: Seiichiro Hirata, Sergy V. Lyusin
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Patent number: 6387310Abstract: A thermosetting resin composition for prestressed concrete tendon, wherein the composition does not harden until the completion of the straining of the tendon, which is the inherent object in the post-tension technique, even if the heat storage temperature in the concrete structures elevates from 30° C. to 80° C. or higher due to heat of hydration reaction in setting a concrete, particularly 95° C. that is the maximum temperature in solidifying a concrete, and the composition including the site of 30° C. or lower where there is substantially no partial heat storage due to heat of hydration reaction in setting the concrete hardens within the prescribed period of time under spontaneous environmental temperature after the subsequent natural cooling, thereby achieving anti-rust and anti-corrosion of the tendon and also adhesion and integral bonding of the tendon and the concrete, a use method thereof and a prestressed concrete tendon.Type: GrantFiled: April 25, 2000Date of Patent: May 14, 2002Assignees: Mitsui Chemicals, Inc., Shinko Wire Company, Ltd.Inventors: Hiroshi Iizuka, Toshio Kobayashi, Mutsuhiko Ohnisi, Seiichiro Hirata
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Patent number: 6329946Abstract: A Global Positioning System carries out Doppler correction of a C/A code sequence after a frequency conversion, and calculates a pseudo range by performing correlation calculation between the C/A code, which is obtained by summing up the C/A code sequence beginning from a polarity inversion boundary determined at a correlation peak detecting step ST10, and a C/A code generated in a GPS terminal. When a received electric field detected by a received electric field intensity detector 11 is good, the current position is determined from the pseudo range and the navigation data extracted by the GPS terminal itself, whereas when the received electric field is poor, the current position is determined from the pseudo range and the navigation data sent from an external apparatus.Type: GrantFiled: May 31, 2000Date of Patent: December 11, 2001Assignees: Mitsubishi Denki Kabushiki Kaisha, Magellan Corporation, Magellan Systems Japan Inc.Inventors: Seiichiro Hirata, Sergy V. Lyusin
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Publication number: 20010028322Abstract: A Global Positioning System forms a C/A code sequence by summing up, beginning from a polarity inversion boundary determined by a correlation peak position detector, chips at corresponding positions in PN frames constituting each bit of navigation data; calculates pseudo ranges by computing correlation between the C/A code sequence and a reference C/A code sequence generated by a GPS terminal; and determines the position of the GPS terminal using the pseudo ranges and navigation data. The navigation data detected inside the GPS terminal is used when a received electric field detected by a received electric field intensity detector is greater than a predetermined level, and the navigation data received from an external system is used when the received electric field is below the predetermined level.Type: ApplicationFiled: May 9, 2001Publication date: October 11, 2001Inventors: Fumio Ueda, Seiichiro Hirata