Synchronization detection apparatus, synchronization detection method, and non-transitory computer readable medium

A synchronization detection method comprising:

• for an externally received signal, each of a plurality of filters each having a different center frequency limiting a band of the received signal to output a plurality of band-limited signals;
• detecting and demodulating each of the plurality of band-limited signals to output a plurality of detected signals;
• performing synchronization detection of each of the plurality of detected signals to output a plurality of correlation values;
• selecting a predetermined filter from among the plurality of filters based on the plurality of correlation values;
• setting the center frequency of the filter based on the correlation values;
• selecting the highest correlation value among the plurality of correlation values as a first correlation value, and when the predetermined filter corresponding to the first correlation value is selected from among the plurality of filters, detecting a frequency deviation value of the selected predetermined filter, and updating the center frequency of the predetermined filter based on the frequency deviation value;
• and
• outputting a predetermined band-limited signal using the updated predetermined filter.

A non-transitory computer readable medium storing a synchronization detection program causing a computer to execute:

• for an externally received signal, each of a plurality of filters each having a different center frequency limiting a band of the received signal to output a plurality of band-limited signals;
• detecting and demodulating each of the plurality of band-limited signals to output a plurality of detected signals;
• performing synchronization detection of each of the plurality of detected signals to output a plurality of correlation values;
• selecting a predetermined filter from among the plurality of filters based on the plurality of correlation values;
• setting the center frequency of the filter based on the correlation values;
• selecting the highest correlation value among the plurality of correlation values as a first correlation value, and when the predetermined filter corresponding to the first correlation value is selected from among the plurality of filters, detecting a frequency deviation value of the selected predetermined filter, and updating the center frequency of the predetermined filter based on the frequency deviation value;
• and
• outputting a predetermined band-limited signal using the updated predetermined filter.