| 摘要 |
A system which accurately detects a position of a vehicle on a road regardless of weather is disclosed. Radio wave reflecting bodies are placed on a road, and transmitter-receiver which can transmit and receive radio waves of wavelength is longer than a millimeter are placed on a vehicle. Based on a ratio of reception strength of the transmitter-receiver in the right and left of the vehicle, a displacement of the vehicle relative to the radio wave reflecting body is detected. The radio wave reflecting bodies have apertures or notches in a predetermined interval so that the radio wave signals reflected thereby has periodicity, and can be distinguished from other objects on the road.
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