| 摘要 |
Embodiments of surveillance systems for detecting the presence of unallowed objects in a predetermined restricted space are disclosed. In some embodiments, a surveillance system detects the presence of unallowed objects in a restricted space including a radar having a data output and further having an electromagnetic wave transmitter having at least two output antennas commutated to the transmitter output by means of transmitter switch, an electromagnetic wave receiver having an output and at least two input antennas commutated to the receiver input by means of receiver switch, a control unit operating said transmitter and receiver switches to select a pair of one input antenna and one output antenna at any given time, a video camera adapted to take successive image frames of the restricted space, a signal processor having a radar data input, a camera data input and output, and a storing device connected to the signal processor. |
