| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a road traffic monitoring device which monitors vehicle traffic while automatically judging the number of lanes, width of each lane and width of a median strip, etc. by measuring a running vehicle by a millimeter-wave radar. <P>SOLUTION: Millimeter-wave beams 7 are emitted by the millimeter-wave radar 2 and a plurality of running vehicles are detected by reception of reflected waves. Distance from the millimeter-wave radar 2, a direction angle and speed, etc. are calculated from relation among an irradiation angle, time to reflection and Doppler shift, a running trajectory of a vehicle is calculated, relation between the number of running vehicles and the vehicle width direction is made into a graph, grouped, the number of lanes is extracted from a mountain of the graph and the lane width is extracted from the mountain and valleys of both sides of the graph. The width of the median strip at a boundary part where the speed component direction of the running trajectory switches from positive to negative is calculated. The vehicle traffic is measured and monitored based on road arrangement obtained by the above. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
