| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce a residual frequency error by stopping sweeping of an AFC section after making a transmission frequency close to a reception frequency in the automatic frequency controller of a satellite communication receiver receiving a radio wave sent continuously. SOLUTION: A sweep means 2 changes a frequency of a local oscillation signal on the occurrence of out of synchronism and a frequency conversion means 1 converts the frequency of the reception signal based on the sweeping local oscillation signal. A demodulation means 3 demodulates an output signal from the frequency conversion means 1. A synchronizing word detection means 4 detects a synchronizing word from an output signal of the demodulation means 3 and the same phase detection means 5 detects it that the phase of the synchronizing word detected by the synchronizing word detection means 4 is in phase continuously for a 1st prescribed number of times. When the in- phase detection means 5 detects it that the phase of the synchronizing word is in phase continuously for a 1st prescribed number of times, a sweep stop means 6 stops sweeping of the frequency of the local oscillation signal by the sweep means 2.</p> |
