Research On High-precision Extraction Method Of P-wave Polarization Angle In Underground Vibration Field

Shallow underground microseismic positioning is the core technology in the field of target positioning in the underground space.It is an important method to realize the positioning of high-value ammunition underground explosion points and penetration trajectory measurement.Among them,the extraction accuracy of P-wave polarization angle and other positioning parameters is the key to achieve high-precision positioning of shallow source.Due to the serious aliasing of P-wave and S-wave in the near field of the source explosion,and the poor polarization characteristics of the wave group,the polarization angle information is "inaccurate",the positioning model is "inaccurate",and the positioning result is "inaccurate".To solve the above problems,this paper proposes a method for extracting P-wave polarization angle information based on HRP-Radon and ACM.First,morphologically correct the data acquired by the sensor array through the information of the first arrival wave;secondly,the HRP-Radon method is used to extract the direct P wave from the aliased signal by using the difference between the focusing characteristics of the P wave and the S wave in the Radon domain;Again,the ACM algorithm is used to establish the extraction model of the direct P-wave angle information,and the error correction of the P-wave angle is performed through the geometric constraint relationship of the sensor array;finally,numerical simulation and field test are carried out.The experimental results show that the method proposed in this paper effectively extracts the P-wave component in the explosive near-field aliasing signal,which significantly improves the extraction accuracy of the polarization angle.This method will provide a theoretical method for achieving high-precision extraction of positioning parameters,and has certain engineering application value in the field of seismic source positioning in shallow underground space.