Near-field directional seismic waves based on tunnel environment

Abstract

Abstract In this paper, a near-field directional seismic wave (NFDSW) method based on near-field application environment is proposed. Different from the far-field directional seismic wave technique, the time-delay parameter of near-field directional seismic wave is not a single fixed value, but a variation value. In this paper, the accurate delay parameters of target signal are estimated by cross-correlation method, then the phase axis of target signal is leveled by delay parameters, and finally the final target signal is obtained by array element superposition and inverse correction. Numerical simulation shows that the near field directional seismic wave technology can separate the target signal well and improve the quality of target signals significantly in the near field environment.