| 摘要 |
PROBLEM TO BE SOLVED: To reduce the amount of interference to an adjacent communication satellite in an earth station device communicating with a communication satellite by operating a plurality of antennas in cooperation, even when the earth station device uses an antenna having so small an opening diameter that an adjacent communication satellite exists in the main beam.SOLUTION: The earth station device is provided with means for adjusting a plurality of antennas to a prescribed antenna interval corresponding to the opening diameter and the number of transmission signal frequencies, and thereby having the zero point of the composite radiation pattern of the plurality of antennas matched to the direction of a communication satellite adjacent to a communication satellite with which communicating. Furthermore, the earth station device is provided with means which, when the plurality of antennas have an error regarding the prescribed antenna interval, performs phase compensation suitable for the error regarding the prescribed antenna interval on transmitted signals from the plurality of antennas, and thereby causes the zero point of the composite radiation pattern of the plurality of antennas to match with the direction of the adjacent communication satellite. |
