Abstract: A positioning method that performs current position calculations and outputs a positioning result position includes searching for satellite signals transmitted from positioning satellites to acquire satellites, combining satellites among the acquired satellites to extract satellite sets used for positioning, performing first positioning calculations on each calculation-target satellite set among the extracted satellite sets using the satellite signals transmitted from the acquired satellites included in the calculation-target satellite set, performing second positioning calculations on each calculation-target satellite set among the extracted satellite sets using the satellite signals transmitted from the acquired satellites that are included in the calculation-target satellite set, but do not include a low-elevation-angle satellite, and determining whether or not a positioning result obtained using the calculation-target satellite set is appropriate based on the difference between a position calculated by th

Abstract: A position determination method includes: performing a positioning process that calculates a located position by performing positioning calculations using satellite signals; determining whether or not a convergence condition is satisfied based on current and preceding positioning results when the positioning process is performed, the convergence condition being specified as a condition for determining whether or not the positioning results of the repeated positioning processes have converged; and determining the located position calculated by the current positioning process to be an output position when the convergence condition is satisfied.

Abstract: A position determination method includes: performing a positioning process that calculates a located position by performing positioning calculations using satellite signals; determining whether or not a convergence condition is satisfied based on current and preceding positioning results when the positioning process is performed, the convergence condition being specified as a condition for determining whether or not the positioning results of the repeated positioning processes have converged; and determining the located position calculated by the current positioning process to be an output position when the convergence condition is satisfied.

Abstract: A terminal device includes a plurality of search channel sections which search for a positioning satellite, a candidate reception frequency calculation section which calculates a candidate reception frequency of a first acquisition target satellite by causing the search channel sections to perform the correlation accumulation process for a first accumulation time, a candidate frequency confirmation section which confirms reliability of the candidate reception frequency by causing the search channel sections to perform the correlation accumulation process for a second accumulation time longer than the first accumulation time, a final frequency calculation section which calculates a final frequency by causing the search channel sections to perform the correlation accumulation process for a third accumulation time longer than the second accumulation time, and a first difference calculation section which calculates a difference between an estimated synchronization frequency corresponding to each first acquisition

Abstract: An evaluation point E of a present position candidate corresponding to each satellite set is calculated based on an a priori residual (APR) (APR value), a PDOP value, and the number of satellites of the target satellite set according to E=k1·f1(APR)+k2·f2(PDOP)+k3·f3(number of satellites). Evaluation coefficients k1 to k3 for respectively weighting evaluation functions f1 to f3 are determined based on an APR average value.

Abstract: A terminal device includes a plurality of search channel sections which search for a positioning satellite, a candidate reception frequency calculation section which calculates a candidate reception frequency of a first acquisition target satellite by causing the search channel sections to perform the correlation accumulation process for a first accumulation time, a candidate frequency confirmation section which confirms reliability of the candidate reception frequency by causing the search channel sections to perform the correlation accumulation process for a second accumulation time longer than the first accumulation time, a final frequency calculation section which calculates a final frequency by causing the search channel sections to perform the correlation accumulation process for a third accumulation time longer than the second accumulation time, and a first difference calculation section which calculates a difference between an estimated synchronization frequency corresponding to each first acquisition

Abstract: A positioning method that performs current position calculations and outputs a positioning result position includes searching for satellite signals transmitted from positioning satellites to acquire satellites, combining satellites among the acquired satellites to extract satellite sets used for positioning, performing first positioning calculations on each calculation-target satellite set among the extracted satellite sets using the satellite signals transmitted from the acquired satellites included in the calculation-target satellite set, performing second positioning calculations on each calculation-target satellite set among the extracted satellite sets using the satellite signals transmitted from the acquired satellites that are included in the calculation-target satellite set, but do not include a low-elevation-angle satellite, and determining whether or not a positioning result obtained using the calculation-target satellite set is appropriate based on the difference between a position calculated by th

Abstract: In the first positioning, a positioning process that calculates the present position based on acquired GPS satellite signals (step A3) is performed a plurality of times. A number of times that the difference (position difference) ?P between the calculated present located position and the preceding located position is successively equal to or less than a given value is counted using a position counter, and a number of times that the difference (time difference) ?T between the present time error and the preceding time error is successively equal to or less than a given value is counted using a time counter each time the positioning process is performed (step A5). A position threshold value and a time threshold value are determined by changing a reference threshold value by an amount corresponding to an APR average value (step A7).

Abstract: An evaluation point E of a present position candidate corresponding to each satellite set is calculated based on an a priori residual (APR) (APR value), a PDOP value, and the number of satellites of the target satellite set according to E=k1·f1(APR)+k2·f2(PDOP)+k3·f3(number of satellites). Evaluation coefficients k1 to k3 for respectively weighting evaluation functions f1 to f3 are determined based on an APR average value.

Abstract: In the first positioning, a positioning process that calculates the present position based on acquired GPS satellite signals (step A3) is performed a plurality of times. A number of times that the difference (position difference) ?P between the calculated present located position and the preceding located position is successively equal to or less than a given value is counted using a position counter, and a number of times that the difference (time difference) ?T between the present time error and the preceding time error is successively equal to or less than a given value is counted using a time counter each time the positioning process is performed (step A5). A position threshold value and a time threshold value are determined by changing a reference threshold value by an amount corresponding to an APR average value (step A7).

Abstract: A position determination method includes: performing a positioning process that calculates a located position by performing positioning calculations using satellite signals; determining whether or not a convergence condition is satisfied based on current and preceding positioning results when the positioning process is performed, the convergence condition being specified as a condition for determining whether or not the positioning results of the repeated positioning processes have converged; and determining the located position calculated by the current positioning process to be an output position when the convergence condition is satisfied.

Abstract: An evaluation point E of a present position candidate corresponding to each satellite set is calculated based on an a priori residual (APR) (APR value), a PDOP value, and the number of satellites of the target satellite set according to E=k1·f1(APR)+k2·f2(PDOP)+k3·f3(number of satellites). Evaluation coefficients k1 to k3 for respectively weighting evaluation functions f1 to f3 are determined based on an APR average value.

Abstract: In the first positioning, a positioning process that calculates the present position based on acquired GPS satellite signals (step A3) is performed a plurality of times. A number of times that the difference (position difference) ?P between the calculated present located position and the preceding located position is successively equal to or less than a given value is counted using a position counter, and a number of times that the difference (time difference) ?T between the present time error and the preceding time error is successively equal to or less than a given value is counted using a time counter each time the positioning process is performed (step A5). A position threshold value and a time threshold value are determined by changing a reference threshold value by an amount corresponding to an APR average value (step A7).

Abstract: Estimation calculations for calculating an estimated present position are performed twice corresponding to each satellite set. The estimated present position calculated by the second estimation calculations is determined to be a present position candidate corresponding to the target satellite set. In the first estimation calculations corresponding to the first satellite set, the calculated satellite position and estimated pseudo-range of each GPS satellite are stored in caches. In the second estimation calculations, the satellite position of each GPS satellite is read from the cache. In the first estimation calculations corresponding to the second or subsequent satellite set, the satellite position and the estimated pseudo-range of each GPS satellite are read from the caches, and the satellite position and the estimated pseudo-range of the GPS satellite of which the satellite position and the estimated pseudo-range have not been stored in the caches are calculated and stored in the caches.

Abstract: A terminal device includes a plurality of search channel sections which search for a positioning satellite, a candidate reception frequency calculation section which calculates a candidate reception frequency of a first acquisition target satellite by causing the search channel sections to perform the correlation accumulation process for a first accumulation time, a candidate frequency confirmation section which confirms reliability of the candidate reception frequency by causing the search channel sections to perform the correlation accumulation process for a second accumulation time longer than the first accumulation time, a final frequency calculation section which calculates a final frequency by causing the search channel sections to perform the correlation accumulation process for a third accumulation time longer than the second accumulation time, and a first difference calculation section which calculates a difference between an estimated synchronization frequency corresponding to each first acquisition

Abstract: A positioning auxiliary information provision device 30 has: a auxiliary information generation device to generate positioning auxiliary information including satellite information; a satellite information update necessity determination device to determine the necessity of updating the satellite information; a satellite information update notification information generation device to generate satellite information update notification information indicating that the satellite information needs to be updated based on the determination result of the satellite information update necessity determination device; a positioning auxiliary information transmission device to transmit the positioning auxiliary information via a mediation device 60 to terminal devices 80a to 80c indicated in provision target terminal information; and a satellite information update notification information transmission device to transmit the satellite information update notification information via the mediation device 60 to the terminal d

Abstract: A positioning auxiliary information provision device 30 has: a auxiliary information generation device to generate positioning auxiliary information including satellite information; a satellite information update necessity determination device to determine the necessity of updating the satellite information; a satellite information update notification information generation device to generate satellite information update notification information indicating that the satellite information needs to be updated based on the determination result of the satellite information update necessity determination device; a positioning auxiliary information transmission device to transmit the positioning auxiliary information via a mediation device 60 to terminal devices 80a to 80c indicated in provision target terminal information; and a satellite information update notification information transmission device to transmit the satellite information update notification information via the mediation device 60 to the terminal d