Seiko Epson Corporation

Hiroki Yoshioka

Fumikazu Sano

Kazuhiko Tsuchimoto

A correlation processing method includes generating a correlation code in which a code value of a chip boundary period is set to a value of a replica code, and a code value of a chip center period other than the chip boundary period is set to a predetermined value, and performing a correlation calculation with respect to the correlation code and a received code signal obtained by demodulating a received signal from a positioning satellite.

Correlation processing method, correlation processing circuit

A method of determining reliability of a received signal is provided, which includes correlating a received signal from a satellite to a replica code, determining reliability of the received signal according to a predetermined reference using a first value and a second value, the first value being a correlation value of a peak phase obtained from the correlating and the second value being a correlation value of a phase delayed for a predetermined phase from the peak phase and changing the reference according to the satellite.

Method of determining reliability of received signal, method of calculating code phase error, and apparatus for determining reliability of received signal

A position calculating method includes: estimating a reception frequency and a code phase related to reception of a positioning signal from a positioning satellite as an estimated measurement; acquiring a reception frequency and a code phase on the basis of the positioning signal received from the positioning satellite; setting a value of an error parameter as an observed measurement, which is used in position calculation using a Kalman filter, on the basis of a difference between the observed measurement and the estimated measurement; and calculating a position by performing the position calculation using the error parameter value.

Position calculating method and position calculating device

A positioning devicereceives a satellite signal from a satellite positioning system (SPS) satellite and locates a present position, the positioning deviceincluding an azimuth calculation section which calculates an azimuth of the SPS satellite corresponding to the received satellite signal, and a reception environment determination section which determines a reception environment including a multipath environment based on the azimuths of the SPS satellites calculated by the azimuth calculation section.

Positioning device, method of controlling positioning device, and recording medium having program for controlling positioning device recorded thereon

A positioning device includes a phase calculation section which performs a correlation process of a specific positioning base code replica and a positioning base code from a specific transmission source to calculate a present phase of the positioning base code, an estimated phase calculation section which calculates an estimated phase when estimating the present phase based on the phase used for preceding positioning, a Doppler shift of a frequency of a radio wave carrying the positioning base code, and an elapsed time from the preceding positioning, a phase difference evaluation section which determines whether or not a phase difference between the calculated present phase and the estimated phase is within a phase difference allowable range specified in advance, and a positioning section which locates a present position using the phase within the phase difference allowable range.

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Matsumoto, Japan

Hiroki Yoshioka