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公开(公告)号：US10890666B2
公开(公告)日：2021-01-12
申请号：US16135229
申请日：2018-09-19
Applicant: CASIO COMPUTER CO., LTD.
Inventor： Tatsuya Sekitsuka , Takeshi Matsue
Abstract: A satellite radiowave receiving device includes a receiver performing a receiving operation of radiowaves transmitted from a positioning satellite and a processor controlling a positioning operation. The processor performs the positioning operation within at least a predetermined maximum positioning interval from a last positioning operation using preliminarily obtained date and time information and valid positional information on the positioning satellite to obtain a current position of the satellite radiowave receiving device and date and time information. The processor causes the receiver to perform the receiving operation within at least a predetermined date and time updating interval shorter than the predetermined maximum positioning interval from a last time when date and time information is obtained from radiowaves transmitted from a positioning satellite to obtain date and time information without the positioning operation.
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Patent Agency Ranking
公开(公告)号：US10663598B2
公开(公告)日：2020-05-26
申请号：US15988580
申请日：2018-05-24
Applicant: CASIO COMPUTER CO., LTD.
Inventor： Takeshi Matsue , Tatsuya Sekitsuka
Abstract: Provided is an electronic device includes an oscillator circuit that outputs a clock signal of predetermined frequency, a clock circuit that counts date and time in accordance with input of the clock signal, a temperature sensor that measures a temperature relating to a change of the predetermined frequency, a receiver that receives a radio wave from a positioning satellite, and a first processor and/or a second processor. The first processor and/or the second processor estimates an amount of time count difference in date and time counted by the clock circuit on the basis of a history of temperatures measured by the temperature sensor, and combines date and time counted by the clock circuit, the estimated amount of time count difference, and part of date-and-time information obtained from a radio wave received by the receiver to identify current date and time.
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公开(公告)号：US10372087B2
公开(公告)日：2019-08-06
申请号：US15388693
申请日：2016-12-22
Applicant: CASIO COMPUTER CO., LTD.
Inventor： Tatsuya Sekitsuka , Takeshi Matsue , Yuki Oshita
Abstract: A satellite radio wave receiving device includes: a receiver that receives a satellite radio wave to identify a reception signal; and a processor that acquires primary date and time information from the identified reception signal and outputs a date and time notifying signal indicating date and time based on the primary date and time information to an outside of the satellite radio wave receiving device. The date and time notifying signal includes at least a timing notifying signal indicating a predetermined timing. The processor determines the predetermined timing without consideration of a timing of a second synchronization point which is a leading edge of every second in the date and time based on the primary date and time information, and outputs the timing notifying signal at the predetermined timing.
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公开(公告)号：US10338154B2
公开(公告)日：2019-07-02
申请号：US15660021
申请日：2017-07-26
Applicant: CASIO COMPUTER CO., LTD.
Inventor： Tatsuya Sekitsuka , Naoto Toda
Abstract: A magnetic field measuring apparatus includes a first processor, a second processor, a motion sensor and a magnetic field sensor. The second processor has higher processing capability than the first processor. The first processor makes the second processor perform certain processing. When it is determined that the state of motion measured by the motion sensor is at a predetermined level or more, the second processor performs a magnetic field correction setting operation as one of the certain processing. The magnetic field correction setting operation involves retrieving measurement values of magnetic field from the magnetic field sensor which are measured at different postures according to a change of the state of motion, and determining an offset correction value for the geomagnetic field based on the measurement values.
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公开(公告)号：US10120346B2
公开(公告)日：2018-11-06
申请号：US15381912
申请日：2016-12-16
Applicant: CASIO COMPUTER CO., LTD.
Inventor： Takeshi Matsue , Hideo Abe , Tatsuya Sekitsuka
IPC: H04B1/00 , G04R20/04 , H04B1/7073 , H04B7/185 , G01S19/37 , H04B1/7075 , G01S19/30
Abstract: A satellite radio wave receiving processing unit 60 includes a front end 60a which receives a radio wave including a code signal transmitted from a satellite, and a baseband unit 64 which acquires the code signal from the received radio wave, in which the baseband unit identifies a pseudo-random code sequence used for performing spread spectrum to the code signal and a phase of the pseudo-random code sequence in a transmission period, identifies a code type of the code signal every time according to the transmission period, identifies, by comparing an array of the identified code type with a plurality of comparison arrays expected to appear as the array of the code type, a head timing of each code in the code signal according to a comparison array in which a result of the comparison satisfies a predetermined condition, and identifies each code in synchronization with the identified head timing.
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公开(公告)号：US10041795B2
公开(公告)日：2018-08-07
申请号：US14852465
申请日：2015-09-11
Applicant: CASIO COMPUTER CO., LTD.
Inventor： Tatsuya Sekitsuka
Abstract: An electronic device includes a magnetic sensor which detects a magnetic field around the electronic device and outputs magnetic data in accordance with the magnetic field detected by the magnetic sensor, a position acquiring section which acquires position information regarding a geographic position of the electronic device, and a processing unit. The processing unit acquires, from the position acquiring section, specific position information for a specific position of the electronic device when an output vector of the magnetic data is oriented to a magnetic pole direction of the earth, derives a geomagnetic vector at the specific position based on the specific position information, and acquires an offset value based on a comparison between the geomagnetic vector and the output vector.
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