| 摘要 |
PURPOSE:To reduce the disturbance due to noise without making the system band narrow by adding a median filter eliminating noise effectively to a carrier phase control loop. CONSTITUTION:A reception signal expressed by an analysis signal is decided to a desired value by a decider 102. An output of the decider 102 is modified by a conjugation device 13 and a normalizing device 104 and multiplied with the input of the decider 102 by a complex number multiplier 105 and an imaginary part selector 106 extracts only the imaginary part. A T-sec delay device 107 and a median selector 108 constitute a median filter. Then the median selector 108 selects and outputs a median so that the order is just in the middle among N sets of taps of the T-sec delay device 107. Thus, the impulse component is eliminated effectively. After the output of the median selector 108 is smoothed by a low pass filter 109, the phase rotation is given to the input signal by a complex number multiplier 101 by a voltage controlled oscillator 110 and controlled so as to make the carrier phase difference zero. |
