| 摘要 |
PROBLEM TO BE SOLVED: To suppress the occurrence of a positioning error caused by a GPS satellite whose GPS signals are deteriorated by multi-pass and noise.SOLUTION: A filter function unit 11 performs selection of GPS satellites used for positioning by using GPS signals of a GPS satellite selected under two conditions. An A positioning function unit 12 and a B positioning function unit perform positioning and calculation of a dispersion value of the positioning result. An installation position calculation unit 14 calculates the position where a GPS module 10 is installed on the basis of the calculated positioning result and the dispersion value. A timing pulse generation unit 15 calculates a time difference between the GPS satellite and the GPS module 10, and generates a timing pulse Tp by correcting the timing pulse included in the GPS signals of the GPS satellite by the time difference. However, as for the GPS signals of the GPS satellite in which the time difference between the GPS satellite and the GPS module 10 fluctuates more largely than that of other GPS satellites, they are excluded from the generation of the timing pulse Tp. |
