| 摘要 |
<p>PURPOSE:To prevent an excessive up-and-down movement of light beam due to the change of attitude during acceleration and deceleration by providing an antenna to emit forward a wave and a transceiver combined with the antenna, both mounted on the front of a car. CONSTITUTION:Provided are an elevation angle controller 30 to control the elevation of an antenna 10, a means to control the antenna elevation downward with the increase of car acceleration detected, a means 31 to detect the elevation of the antenna against the road based on the measured distance and direction and to control the elevation to a predetermined angle.</p> |
