| 摘要 |
PROBLEM TO BE SOLVED: To accurately and quasi-synchronously detect a received signal even when an oscillator is not accurate and the phase and the frequency of a carrier signal included in the received signal vary. SOLUTION: An oscillation part 121 in the oscillator 12 outputs the carrier signal for demodulation. A quasi-synchronism detector 13 quasi-synchronously detects the received signal through the use of the oscillation output of the oscillator 12. A synchronization acquiring part 14, a mean value arithmetic part 151 in a frequency difference computing element 15 and a phase difference detection part 152 detect the phase variation of a spreading code included in a quasi- synchronism detection output. A frequency difference arithmetic part 153 in a frequency difference computing element 15 and a frequency arithmetic part 122 in the oscillator 12 control the oscillation frequency of the oscillation part 121 based on detected phase variation. |
