RADIO WAVE REFLECTOR FOR DETECTING POSITION OF VEHICLE

摘要

PROBLEM TO BE SOLVED: To facilitate identification of radio waves reflected from a radio wave reflector for detecting the position of a vehicle provided on the surface of a road from that reflected from other undesired reflecting objects such as the road surface. SOLUTION: A marker 1 as radio reflector for detecting the position of a vehicle is so formed as to make a radio wave reflecting part 1a stick out of the surface 2 of a road. The height h1 of the marker 1 is made lower than that of the lowest part of the vehicle 4 to protect the vehicle from possible damage during the running thereof. As the radio reflecting part 1a is made higher by h2 than the road surface 2, even when the top of the road is immersed in water by downpour or the like, receiving sensitivity will not lower under the influence of the film of the water. The marker herein used is that able of changing the direction of a polarized wave reflected on a surface thereby facilitating the distinguishing of the reflected wave from that from an undesired reflecting object such as the road surface 2.