| 摘要 |
PURPOSE:To obtain a sufficient compensation effect to an optional signal independently of the modulation system of an interference signal by receiving an interference source signal through another antenna from an interference signal mixed in a main signal and adding the source signal to the interference component in the main signal with an equal amplitude and in an opposite phase. CONSTITUTION:An interference signal receiving from an auxiliary antenna 4 receiving only the interference signal component included in the main signal passes through a variable attenuator 8 and a variable phase shifter 9 and divided into two by a distributor 10. After the main signal including residual interference is subject to synchronization detection (12, 13) by a demodulator 100, the result is given to harmonic rejection filters 14, 15. The interference signal being an output of the distributor 10 is detected by using a carrier recovered by a main signal demodulator with orthogonal phase detectors 22, 23 and given to harmonic rejection filters 24, 25. The demodulation signal at the main signal is given to circuits 18, 19 taking the difference between the output of identification circuits 16, 17 and the input signal of the identification circuit to extract only the residual interference component only. To earn the control gain, the sum of products 27, 28 is taken and used a the control signal, and similarly, the difference between the products 29 and 30 is taken and used as a control signal to minimize the residual interference included in the main signal.
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