Seiko Epson Corporation

Naoki Gobara

Mikio Nagahara

Maho Terashima

Hiroshi Uozumi

Naganobu Aoki

Ryota Hirakawa

A monitoring terminal includes a control unit configured to acquire a current date and time indicating a date and time at present, a storage unit configured to store a first destination to which a first object is shipped and a shipping date and time indicating a date and time at which the first object is shipped to the first destination, and an acquisition unit configured to acquire first position information indicating a position of the first object at a first interval when the current date and time is a date and time before the shipping date and time, wherein the acquisition unit acquires the first position information at a second interval shorter than the first interval, when the current date and time is a date and time after the shipping date and time.

Monitoring terminal, terminal management system, terminal management method, and program

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.

Mobile terminal, semiconductor IC, and control method

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.

Selection method, positioning device and program

A satellite signal receiver has a positioning error in a range from &#x2212;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 &#x2212;135 dBm and average power consumption from start of positioning to first positioning equal to or less than 7 mW.

Satellite signal receiver

An integrated circuit for satellite signal reception includes a position calculation part and has a volume of 9.33 mmor less, and a time from measurement start to initial measurement of 120 seconds or less at a signal intensity of &#x2212;162 dBm or more and &#x2212;160 dBm or less.

Integrated circuit for satellite signal reception

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.

Receiving unit driving control method, receiving device and electronic apparatus

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.

Correlation calculation process execution method, control circuit, signal processing circuit, and position calculation device

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.

Correlation calculating method, satellite signal capturing method, and correlation calculating circuit

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.

Receiving unit driving control method and receiving device

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.

Decoding method and receiving device

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&#x2267;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&#x3e;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.

Bit change determination method and bit change determination device

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.

Capture frequency decision methods and receivers

A received signal determination method includes: receiving a positioning signal; performing correlation calculations on the received positioning signal using a code replica of one spreading code among the plurality of spreading codes; selecting a total peak value and a remote peak value, the total peak value being a first maximum correlation value among correlation values obtained by the correlation calculations, and the remote peak value being a second maximum correlation value among correlation values apart from a phase of the total peak value by a phase equal to or greater than a given phase; changing a threshold value condition for the total peak value based on the remote peak value; and determining whether or not the received positioning signal is spread-modulated with the one spreading code by determining whether or not the total peak value satisfies the threshold value condition.

Received signal determination method, positioning device, and electronic instrument

A positioning method includes: executing a first correlation accumulation process on a received signal, a positioning signal spread-modulated with a spread code, and a replica code of the spread code while shifting a phase of the replica code in a first phase search range, setting a second phase search range narrower than the first range based on an accumulated correlation value at a first timing in the first correlation accumulation process, executing a second correlation accumulation process on the received signal and the replica code while shifting the phase of the replica code in the second phase search range, determining appropriateness of the second phase search range based on the accumulated correlation value at the first timing and an accumulated correlation value at a second timing in the first correlation accumulation process, and positioning using a result of the second correlation accumulation process, if the second phase search range is determined appropriate.

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Shiojiri, Japan

Naoki Gobara