| Patent application number | Description | Published |
|---|
| 20090262019 | PSEUDORANGE CALCULATION METHOD, POSITION CALCULATION METHOD, COMPUTER-READABLE RECORDING MEDIUM, AND POSITION CALCULATION DEVICE - A pseudorange calculation method for calculating a pseudorange in a position calculation device includes: passing a received signal received from a satellite for position calculation through a first filter; passing the received signal through a second filter having a different phase characteristic from that of the first filter; calculating a first pseudorange on the basis of a signal acquired by passing through the first filter; calculating a second pseudorange on the basis of a signal acquired by passing through the second filter; and calculating a third pseudorange to be used for position calculation, on the basis of the first pseudorange and the second pseudorange. | 10-22-2009 |
| 20090284414 | POSITIONING METHOD, PROGRAM THEREOF, AND POSITIONING DEVICE - 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. | 11-19-2009 |
| Patent application number | Description | Published |
|---|
| 20080291085 | TERMINAL DEVICE, METHOD OF CONTROLLING TERMINAL DEVICE, AND RECORDING MEDIUM - A terminal device searches for a satellite signal by performing a correlation process over a predetermined first accumulation time within a predetermined frequency range in units of search frequencies at specific intervals. When the terminal device has failed in searching for the satellite signal, the terminal device searches for the satellite signal by performing the correlation process over a predetermined second accumulation time longer than the first accumulation time at the search frequency and frequencies differing from the search frequency by a specific frequency which is less than the interval of the search frequencies and specified based on a drift of a reference oscillator of the terminal device within the second accumulation time. The terminal device determines a search result of the satellite signal based on a search result at the search frequency and search results at the frequencies differing from the search frequency by the specific frequency. | 11-27-2008 |
| 20090129449 | RECEIVED SIGNAL DETERMINATION METHOD, POSITIONING DEVICE, AND ELECTRONIC INSTRUMENT - 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. | 05-21-2009 |
| 20090168853 | CORRELATION CALCULATION PROCESS EXECUTION METHOD, CONTROL CIRCUIT, SIGNAL PROCESSING CIRCUIT, AND POSITION CALCULATION DEVICE - 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. | 07-02-2009 |
| 20090237301 | TERMINAL DEVICE, METHOD OF CONTROLLING TERMINAL DEVICE, AND RECORDING MEDIUM - A terminal device searches for a satellite signal by performing a correlation process over a predetermined first accumulation time within a predetermined frequency range in units of search frequencies at specific intervals. When the terminal device has failed in searching for the satellite signal, the terminal device searches for the satellite signal by performing the correlation process over a predetermined second accumulation time longer than the first accumulation time at the search frequency and frequencies differing from the search frequency by a specific frequency which is less than the interval of the search frequencies and specified based on a drift of a reference oscillator of the terminal device within the second accumulation time. The terminal device determines a search result of the satellite signal based on a search result at the search frequency and search results at the frequencies differing from the search frequency by the specific frequency. | 09-24-2009 |
