Abstract: A baseband control unit operates a reception unit and stores a reception signal in a sampling memory unit, and then stops an operation of the reception unit and causes a correlation computation processing unit to compute a correlation value for searching for a position information satellite based on the stored reception data. The baseband control unit operates the reception unit and stores the reception data in a bank 0 in a part of a first period of periods continuous in order at time intervals of 20 ms, and stops the reception unit and causes the correlation computation processing unit to compute a correlation value for searching for and tracking the position information satellite based on the reception data stored in the bank 0 in a remaining period of 1 ms.

Abstract: A mobile terminal having a second communication device performing Sigfox communication, which is a wireless communication standard such that an acknowledgement is not sent back even when data is received, includes: a specifying unit specifying a state of the mobile terminal; a determination unit determining whether the state specified by the specifying unit satisfies a predetermined condition or not; and a communication control unit starting Sigfox communication using the second communication device, when the determination unit determines that the predetermined condition is satisfied.

Abstract: A mobile terminal having a second communication device performing Sigfox communication, which is a wireless communication standard such that an acknowledgement is not sent back even when data is received, includes: a specifying unit specifying a state of the mobile terminal; a determination unit determining whether the state specified by the specifying unit satisfies a predetermined condition or not; and a communication control unit starting Sigfox communication using the second communication device, when the determination unit determines that the predetermined condition is satisfied.

Abstract: A method of selecting a satellite positioning system which is used in positioning by a positioning device capable of performing positioning based on a plurality of satellite positioning systems includes acquiring given support information which is referred to in selecting a satellite positioning system, and selecting a satellite positioning system which is used in positioning from the plurality of satellite positioning systems, on the basis of the support information.

Abstract: A satellite signal receiver has a positioning error in a range from ?8 m to +8 m with a probability equal to or more than 95% when positioning in a reception environment with a signal strength equal to or more than ?135 dBm and average power consumption from start of positioning to first positioning equal to or less than 7 mW.

Abstract: An integrated circuit for satellite signal reception includes a position calculation part and has a volume of 9.33 mm3 or less, and a time from measurement start to initial measurement of 120 seconds or less at a signal intensity of ?162 dBm or more and ?160 dBm or less.

Abstract: An RF receiving circuit unit that receives a GPS satellite signal from a GPS satellite is intermittently driven by a first driving control of intermittently driving the RF receiving circuit unit with a first intermittent driving pattern and a multistage driving control of intermittently driving the RF receiving circuit unit with a multistage intermittent driving pattern in which a driving period in the first intermittent driving pattern is set to a second intermittent driving pattern of which an intermittent cycle is shorter than that of the first intermittent driving pattern.

Abstract: A motion measuring device includes a processor which measures a motion with the use of a signal generated by a sensor . The processor switches an item for the measurement of motion to another item for measurement of motion according to a site of installation of the sensor.

Abstract: A performance information calculation method executed by an apparatus carried by a user who makes motion accompanied by cyclic body motion, and the method includes detecting motion cycle of the user, setting a reception action suspended period, during which a positioning satellite signal is not received, in each predetermined calculation cycle on the basis of the motion cycle, and calculating performance information in each of the calculation cycles on the basis of the positioning satellite signal received in a period other than the reception action suspended period.

Abstract: A method of selecting a satellite positioning system which is used in positioning by a positioning device capable of performing positioning based on a plurality of satellite positioning systems includes acquiring given support information which is referred to in selecting a satellite positioning system, and selecting a satellite positioning system which is used in positioning from the plurality of satellite positioning systems, on the basis of the support information.

Abstract: A position calculation method includes calculating a position of a movable body for a predetermined time period, determining whether or not there is a directional change of the movable body, and if it is determined that there is a directional change, recalculating a position of the movable body for each short period in a period which begins earlier than the time at which the determining is performed, wherein the short period is shorter than the predetermined time period.

Abstract: A correlation calculation process execution method utilizes a first mode and a second mode as a positioning mode that performs a correlation calculation process on a received signal of a positioning signal that is spread-modulated by a spreading code and a signal replica of the spreading code, the first mode being a mode in which correlation values are averaged in a first mode process period to output a correlation value, and the second mode being a mode in which correlation values are integrated in a second mode process period to output a correlation value, the method including repeating the first mode and the second mode while setting an intermediate time of the first mode process period to be the same as an integration reference time of the second mode process period, and variably setting a ratio of an ON/OFF period in at least one period of the first mode process period and the second mode process period.

Abstract: A correlation calculating method of correlating a received code signal obtained by demodulating a received signal, which is a signal obtained by receiving a positioning satellite signal, with a replica code signal is provided which includes: correlating values of the replica code signal in a chip period with values of the received code signal at first to n-th arrival times obtained by varying an arrival time of the chip period by 1/n chip (where n is an integer equal to or greater than 2); and acquiring a correlation calculation result at a 1/n chip interval by synthesizing the correlation calculation results.

Abstract: An integrated circuit for satellite signal reception includes a position calculation part and has a volume of 9.33 mm3 or less, and a time from measurement start to initial measurement of 120 seconds or less at a signal intensity of ?162 dBm or more and ?160 dBm or less.

Abstract: A code phase is detected on the basis of a signal received by an RF receiving circuit unit which is a receiving unit that receives a GPS satellite signal. When the code phase is within a predetermined edge of a PRN code, a control of suppressing intermittent driving of the RF receiving circuit unit is performed.

Abstract: 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.

Abstract: A satellite signal receiver has a positioning error in a range from ?8 m to +8 m with a probability equal to or more than 95% when positioning in a reception environment with a signal strength equal to or more than ?135 dBm and average power consumption from start of positioning to first positioning equal to or less than 7 mW.

Abstract: A first correlation calculation is performed based on a first predicted frequency, with respect to received data of a GPS satellite signal. An error frequency of the first predicted frequency is estimated using a carrier phase of the GPS satellite signal based on the result of the first correlation calculation. The first predicted frequency is corrected using the error frequency, and a second predicted frequency is thus calculated. Then, a second correlation calculation is performed with respect to the same received data, based on the second predicted frequency. A navigation message carried on the GPS satellite signal is decoded using the result of the second correlation calculation.

Abstract: A bit change determination method includes performing a correlation operation of a signal received from a satellite and a replica code, segmenting the signal using a bit transition timing of navigation message data and performing a first calculation to calculate the result of the correlation operation for a first period having N (N?1) continuous unit periods with a bit period of navigation message data as a unit period, performing a second calculation to calculate the result of the correlation operation for a second period having M (M>1) continuous unit periods adjacent to the first period, and determining whether a bit value changes or not at a boundary between the first period and the second period using the first and second calculation results.

Abstract: A capture frequency decision method of deciding a capture frequency by executing a frequency search in which a correlation operation on a received signal, which is a CDMA (Code Division Multiple Access) signal, is performed at a plurality of search frequencies, includes: executing a first frequency search; setting a frequency for a side lobe check on the basis of a correlation integration time used in the first frequency search; selecting a plurality of search frequencies including the frequency for a side lobe check on the basis of a result of the first frequency search; executing a second frequency search of performing the correlation operation at the plurality of selected search frequencies; and deciding a capture frequency by executing a third frequency search using a result of the second frequency search.