Two-stage wake-up circuit for underwater acoustic communication and wake-up method thereof

The invention relates to a two-stage wake-up circuit for underwater acoustic communication and a wake-up method thereof. The two-stage wake-up circuit is respectively connected to a receiving node anda receiving transducer, the receiving transducer performs data communication with the sending node through a sending transducer, and the two-stage wake-up circuit is characterized in that: the two-stage wake-up circuit comprises a signal preprocessing module and a single-chip microcomputer module; the signal preprocessing module continuously monitors a communication channel, and when the receiving transducer sends a wake-up signal, the received wake-up signal is preprocessed and then sent to the single-chip microcomputer module; the single-chip microcomputer module judges the preprocessing result according to a preset voltage threshold value; and when the preprocessed wake-up signal exceeds a preset voltage threshold, validity judgment is carried out on the preprocessed wake-up signal, and two paths of signals ar