| 摘要 |
PROBLEM TO BE SOLVED: To enhance the positioning accuracy significantly by eliminating the effect of multipath. SOLUTION: A GPS satellite delivers a right circularly polarized wave of carrier frequency and the polarizing direction of an antenna is turned by an antenna polarizing direction turning unit 3. Since a direct wave and the reflected wave of a left circularly polarized wave are subjected to frequency shift in different directions, a capturing/tracking frequency range is set around the shifting position of direct wave at a capturing/tracking frequency range converting section 24 such that a shifted wave deviates from that range thus preventing erroneous capturing/tracking of reflected wave and enhancing the positioning accuracy. |
