| 摘要 |
The system has at least one sensor, especially a radar unit. This emits pulsed radar signals and receives radar signals reflected in a monitored area used to detect incursions into the monitored area. Radar signals used for detection are reflected inside the area at a large distance or on a spherical shell defined by a suitable large radius. Faults are detected using radar signals reflected at a defined smaller distance or spherical shell. |
