Frequency adjustment method

A frequency adjustment method, applied to a reference oscillation signal, the method comprising:

• dividing a frequency scan section into M scan frequencies, wherein M is a positive integer greater than 1;
• down-converting a signal according to the M scan frequencies to obtain M down-converted signals;
• performing a correlation calculation operation on the M down-converted signals, respectively, to obtain M correlation results;
• grouping the M scan frequencies into N frequency groups, wherein N is a positive integer greater than 1, performing a group calculation operation on the N frequency groups, respectively, to obtain N group calculation results;
• and
• selecting a target frequency group from the N frequency groups according to the N group calculation results, and obtaining an adjusted oscillation frequency from the target frequency group,
• wherein each frequency group comprising P selected frequencies, wherein P is a positive integer greater than 1, corresponding to P consecutive scan frequencies in the frequency scan section, wherein every two consecutive frequency groups in the N frequency groups comprise same (P−1) selected frequencies,
• wherein the step of performing the group calculation operation on the N frequency groups, respectively, to obtain the N group calculation results comprises:
• selecting the frequency group on which the group calculation operation is to be performed from the N frequency groups;
• selecting P correlation results from the M correlation results according to the target frequency group;
• sequentially corresponding P weightings to the selected P correlation results, and performing a weighted accumulation operation on the selected P correlation results;
• and
• repeating the above steps to obtain the N group calculation results corresponding to the N frequency groups.