| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic frequency control apparatus which can highly precisely synchronize the frequency of a local carrier without enlarging a circuit scale. SOLUTION: The control apparatus is provided with a complex correlation calculation part 11 outputting a complex correlation signal by the correlation operation of a complex spectrum diffusion signal being a semisynchronism detection output and a diffusion code, a code synchronizing part 12 generating a sample clock for sampling the complex spectrum diffusion signal based on the complex correction signal and a data clock synchronized with the repetition period, delay correction parts 13-1 to 13-N correcting delay so that the generation timings of correlation peak values with respect to the respective parallel transmission signals of the complex correlation signals branched into N signals are adjusted, and a synthesized frequency error signal generating part 18 generating a synthesized frequency error signal, based on latched signals. The frequency offset of the local carrier is corrected, based on the synthesized frequency error signal. |
