Method and system for detecting mud pressure pulse signal

The invention discloses a method and a system for detecting a mud pressure pulse signal. The method comprise the following steps: S1, receiving a signal containing mud pressure pulse encoding information from a mud medium; S2, performing low-pass filtering on the received signal; S3, performing average algorithm processing on the signal after the low-pass filtering; S4, performing Chebyshev low-pass filtering on the signal after the average algorithm processing; S5, amplifying the signal after the Chebyshev low-pass filtering; S6, performing base value reduction on the amplified data; S7, demodulating downhole measurement data from the received signal according to an encoding protocol. Through signal amplification, the proportion of pulse with consistent shape and width with effective pulse can be amplified to the largest, and from this aspect, the amplitude between the effective pulse and interfering pulse in other shapes is enlarged, so that detection decoding is facilitated and the decoding accuracy is improved.