| 摘要 |
PURPOSE:To attain a simple antenna direction system at a low cost by calculating the antenna azimuth angle in a coordinate of an airframe based on an airplane heading azimuth angle and a command azimuth angle. CONSTITUTION:A couple of antenna units 1A, 1B comprising plural directional antennas 4a-4d, 4e-4h having a prescribed elevating angle installed to the front and rear part of a mobile body 2 such as a copter arranged around the azimuth angle in a different azimuth angle, a direction gyroscope 5 detecting the airframe azimuth angle with respect to the magnetic north, means 7, 8 setting the command azimuth angle representing the direction of antenna directivity in the coordinate of the earth by a command from a ground station or the aircraft operation, and an operation means 10 calculating the antenna azimuth angle with respect to the coordinate of the airframe based on the airplane heading azimuth angle and the command azimuth angle, are provided. Then the antenna azimuth angle and the setting azimuth angle of the directivity antennas 4a-4d, 4e-4h in a couple of the antenna units 1A, 1B are compared and a directivity antenna suited to the result of comparison is selected as a transmission antenna. Thus, no antenna drive mechanism is required and neither complicated coordinate system nor calculation is required.
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