| 摘要 |
PURPOSE:To decrease a master station signal leaked to a difference signal by applying amplitude phase detection to a master station signal component including a difference signal based on a frequency signal phase-locked to the master station signal component included in a sum signal between reception antennas and using the detection signal to control a reception signal. CONSTITUTION:In connecting a switch circuit 24 to the side of a sum signal between reception antennas 11, 12, then a mixer 28, a phase detector 32 and a VCO29 are oscillated in a frequency phase-locked to a master station. In connecting the circuit 24 to the side of a difference signal DELTA between the antennas 11, 12, the signal is mixed with an output of the circuit 29 at mixers 27, 28 and the result is a master station component leaked to the side of the signal. The output of the mixer 27 inputs the DC component proportional to the amplitude error to variable amplifiers 22, 23 as a control signal via an amplitude detection circuit 30, the output of the mixer 28 inputs the DC component proportional to a sine of a phase theta of the master station signal included in the signal DELTAvia a phase detector 31 to variable phase shifters 20, 21 as a control signal to reduce a master station leakage signal.
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