| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve highly accurate frequency correction on the receiving side of a communication system based on a JT65 communication protocol.SOLUTION: A first frequency indicating maximum power in a band of a receiving signal Rr is set to a reference frequency pf2. A plurality of symbols arrayed through the optional number of symbols are set to error detecting symbols Sdto Sd. In the error detecting symbols Sdto Sd, second frequencies indicating maximum power out of a frequency group to which a plurality of symbols arrayed before and after the error detecting symbols Sdto Sdin the receiving order are overlapped are selected as local reference frequencies pf3to pfin an error detecting symbol Sd. In the error detecting symbol Sd, errors eto ebetween the reference frequency pf2 and the local reference frequencies pf3to pfare calculated and a frequency of a receiving signal Rr is corrected so that the errors eto eapproach zero as much as possible.</p> |
