| 摘要 |
PROBLEM TO BE SOLVED: To obtain a satellite communications system which can always maintain satisfactory satellite communication by reducing interference received from or to another satellite communication network. SOLUTION: A signal received by an antenna element 11 is received and demodulated by a receiver 23. A reception level detection part 25 detects and outputs the reception signal level of the antenna element 11 to a decision part/ control part 6. The signal received by a nondirectional antenna 2 is received and demodulated by a receiver 24. When the reception level of the antenna element 11 drops below a prescribed value, the decision part/control part 6 switches the antenna element 11 to another antenna element 12 to continue the communication. The nondirectional antenna 2 is connected immediately before the antenna element 11 is switched to the antenna element 12, and the nondirectional antenna 2 is disconnected immediately after the switching to the directional antenna 12. The nondirectional antenna 2 is connected and disconnected by an antenna switch 4 according to the instruction of the decision part/control part 6.
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