Noise reduction measurement method of acoustic while drilling data based on signal synchronization

A noise reduction measurement method of acoustic while drilling data, comprising:

• S0, operating a pulser and an acoustic instrument while drilling to emit acoustic signals comprising a first acoustic signal from the pulser and a second acoustic signal from the acoustic instrument:
• S1, setting a timer time1, performing pre-sampling once at every set time interval to obtained raw data of pre-sampled acoustic signals;
• S2, performing fast Fourier transform processing on the raw data of the pre-sampled acoustic signals to obtain spectral data, traversing and comparing the spectral data to obtain a center frequency f of the pulser;
• S3, filtering the pre-sampled raw data according to the center frequency f to remove spike noise interference in the raw data to obtain a filtered acoustic signal data;
• S4, processing the filtered acoustic signal data in step S3 to find a maximum value in each pulser transmission cycle, which has a phase of π/2;
• then determining a plurality of sampling points corresponding to a 0 phase according to the center frequency f so as to obtain real-time phase information of the first acoustic signal;
• and
• S5, determining a transmission interval of the acoustic instrument according to the center frequency f;
• and determining, based on the real-time phase information of the first acoustic signal, and sampling the second acoustic signal by the receiver strip such that the second acoustic signal sampled by the receiver strip is near the 0 phase of the first acoustic signal,
• wherein the 0 phase of the first acoustic signal is re-determined after each power-on of the pulser, and the 0 phase of the second acoustic signal is re-synchronized with the sampling time.