| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a railroad-crossing obstacle detector that detects an obstacle without causing false detection due to buildings present inside and outside a monitoring area. <P>SOLUTION: A signal processing part 3 stores background pattern information in a monitoring area SA set at the location in front of reflecting plates (11-13), (21-23) with reference to a transmitter/receiver 1, 2. The signal processing part analyzes electric signals supplied from the transmitter/receiver 1, 2, cancels the electric signals, belonging to reflected waves of the background pattern, by the stored background pattern information, and detects an obstacle 10 in the monitoring area SA on the basis of reflected waves from the obstacle 10 in the same. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
