| 摘要 |
A monitoring apparatus of the present application comprises: a transmission antenna section for sending out a radio wave of single beam having a wide angle or alternatively a radio wave having a narrower (angular) range in a plurality of beam directions; a receiving antenna section for receiving the radio wave in a plurality of beam directions transmitted by the transmission antenna section and then reflected by the target and for having a first power feed section and a second power feed section; a transmission section for transmitting to the transmission antenna section a signal to be sent out as the radio wave; a receiving section to which the radio wave received by the receiving antenna section is transmitted as a signal from the receiving antenna section ; and beam switching instrument which performs a switching operation such that power should be fed to either the first power feed section or the second power feed section, which thereby forms the beam directions of two radio waves, and which thereby controls a monitoring area.
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