| 摘要 |
PURPOSE:To improve the response of interference wave compensation, by giving a low-frequency minute fluctuation to the amplitude and the phase of the interference wave received by an auxiliary antenna and by detecting the phase and the magnitude of the low-frequency amplitude fluctuation of the interference wave synthesized with the output of a main antenna system. CONSTITUTION:The interference wave from an auxiliary antenna 2 directed toward an interference wave source is inputted to an amplitude and phase control circuit 3 and is adjusted to the same amplitude as the interference wave from a main antenna 1 and the phase opposite to that of the interference wave from the main antenna 1 by the circuit 3 and is synthesized with the output of the antenna 1 by a synthesizer 4. The circuit 3 receives two control signals, where a signal from a low frequency oscillator 7 and a signal obtained by shifting the phase of the signal from the oscillator by 90 deg. in a phase shifter 12 are superposed to a DC signal, to control the amplitude and the phase of the signal from the antenna 2. The output of the synthesizer 4 is amplified by an amplifier 9 and has the envelope detected by an envelope detector 10, and modulated low frequency components are amplified by an amplifier 11 and have the phase detected by detectors 13a and 13b, and only DC components are amplified by amplifiers 14a and 14b. Outputs of these amplifiers are subjected to voltage integration by voltage integrators 6a and 6b and are added to the low frequency signal by adders 8a and 8b and become control signals of the circuit 3. Thus, a signal with the interference wave eliminated is outputted from the synthesizer 4. |
