| 摘要 |
PROBLEM TO BE SOLVED: To adjust a direction of a parabolic antenna, while keeping a quality of video without occurrence of excessive input of reception electric field so as to avoid breaking of an FPU receiver, even if a helicopter approaches a reception base station. SOLUTION: In the transmission system having a transmitter provided with a transmission antenna and a receiver, provided with a reception antenna and a direction adjustment means of the reception antenna, reception electric field intensity is monitored by a prescribed period. When the reception electric field strength is equal to or larger than a prescribed value, the direction adjustment operation of the reception antenna is stopped until the reception electric field value becomes equal to or larger than the prescribed value so as to prevent the reception electric field value from exceeding a prescribed threshold. Alternatively, the operation is controlled, in a state of deviating the direction of the reception antenna by a prescribed angle so as to prevent the reception electric field value from exceeding the prescribed threshold. COPYRIGHT: (C)2006,JPO&NCIPI
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