| 摘要 |
PURPOSE:To reduce the interferring radio wave returned to a receiving antenna from a transmission antenna via space by transmitting a pilot signal from the receiving antenna. CONSTITUTION:A signal received on the receiving antenna 1 is a synthesis wave between a signal by a normal incoming radio wave and an interference signal gone round the space after the irradiation from the transmission antenna 2. Since the input signal of a relay amplifier 3 is added with a feedback signal via a feedback loop 4, the interference wave is reduced by cancelling the interference signal and the feedback signal. That is, when the pilot signal of a single frequency is transmitted from the receiving antenna 1, it is extracted by a pilot signal detecting filter 11a, and the amplitude and phase of the feedback loop signal are controlled by detecting the cancelling residual component of the feedback loop signal and the interference signal, allowing to form automatically the optimum compensating condition. |
