| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a railroad-crossing obstacle detector having an object tracking function which enables to determine that an object is moving and the moving object is the same object. <P>SOLUTION: The railroad-crossing obstacle detector has the following configuration. A transmitter/receiver transmits radio waves into an area including a railroad cross and receives reflected waves from an object existing inside the area so as to convert them into electric signals. The electric signals are supplied from the transmitter/receiver to a signal processing part. The signal processing part calculates the distance from the transmitter/receiver to the object for each prescribed detection cycle on the basis of the electric signals. The device is configured to set the following state as the condition for determining to be the same object, that is, a distance L2 calculated in the current detection cycle T2 and a distance L0 calculated in the last detection cycle T1 are respectively within a predetermined difference ΔL in the two continuous detection cycles. <P>COPYRIGHT: (C)2012,JPO&INPIT |
