| 摘要 |
PROBLEM TO BE SOLVED: To reduce the influence of a multipass in the case of measurement of a vehicle position by the use of a satellite positioning system.SOLUTION: A vehicle position measuring system 2 receives satellite signals from a GPS satellite 6 and calculates, for each epoch, a pseudo distance L and a Doppler shift frequency fd. The system calculates the difference between a pseudo distance change amount ▵L and a relative movement amount ▵D of the GPS satellite 6 and a train 4 obtained from the Doppler shift frequency fd, as a deviation amount Qe. If the deviation amount Qe is a determination reference value k or more, the satellite is eliminated from satellites used for positioning, and if it is less than the determination reference value k, the satellite is regarded as a satellite used for positioning. |
