| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a roadside communication antenna controller capable of maintaining the quality of communication with a traveling object such as a vehicle. <P>SOLUTION: The roadside communication antenna controller which controls a roadside communication antenna for communication with the vehicle acquires position information on the vehicle establishing communication with the roadside communication antenna, estimates a communication establishment zone that the roadside communication antenna forms based upon the acquired position information. The tilt angle of an antenna beam is made small so as to make the communication establishment zone wide when the estimated communication establishment zone has a too short distance shorter for its design value, and the tilt angle θ is or large so as to make the communication establishment zone narrow when the estimated communication establishment zone has a too long distance for its design value. <P>COPYRIGHT: (C)2008,JPO&INPIT |
