| 摘要 |
PURPOSE:To suppress the effect of a disturbance wave, by detecting the electric power of the disturbance wave and applying a weighting inversely proportional to the electric wave of disturbance wave to a received wave. CONSTITUTION:When a disturbance wave exists on a path 1, the receiving electric power is obtained by an amplitude squaring device 10 and a low-pass filter 11. Then the outputs of a deciding device 4 and a conjugating circuit 5 are multiplied by each other and then made to pass through an amplitude squaring device 9 to obtain a signal electric power. A subtraction is given to the signal electric power to extract the disturbance wave electric power beta<2>. A rectifier 13 holds (r) when the power beta<2> is smaller than a constant value (r) of a constant voltage 15 and delivers beta<2> when the beta<2> is larger than the value (r). Accordingly, a divider 14 delivers r/beta<2> and 1 when the disturbance wave electric power is large and small, respectively. As a result, a variable attenuator 8 is actuated in proportion to the value of the disturbance wave power. |
