| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a radio monitoring system of inexpensive constitution, in which high-sensitivity and high-speed communication is performed between a monitor device and a plurality of camera devices. <P>SOLUTION: The plurality of camera devices 2 transmit signals including camera IDs simultaneously by using frequency channels characteristic of themselves, and the monitor device 3 receives the above signals while changing the directivity of a phased array antenna 30. A control part 39 of the monitor device 3 recognizes directions of the respective camera devices 2 based upon reception intensities of the received signals, and stores them. When image data is received from a camera device 2, the directivity of the phased array antenna 30 is matched with the stored direction of the camera device 2. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
