| 摘要 |
Disclosed is a system for detecting the presence of a moving vehicle 72. The system has an emitting antenna 3 mounted on the vehicle, the antenna adapted to emit an electromagnetic field in a range of directions. An receiving antenna 73 is mounted on the rail track and is connected to a detector device 91, 93 which is adapted to produce a detection signal depending on a received field intensity of the electromagnetic field. The emitted field intensity of the electromagnetic field is a function of the emitting direction, such that the function comprises a maximum intensity or a minimum intensity in a predefined emitting direction. The detector device thus detects the presence of the vehicle if the antenna receives the maximum or minimum intensity field strength. The detector may be connected to several antenna and thus be able to determine the direction of travel of the vehicle. The system may be designed to control the supply of electrical energy to the vehicle by powering up sections of the track when the vehicle is detected. |
