Device, system and method for acquiring incident azimuth angle of plane seismic wave

The invention discloses a plane seismic wave incidence azimuth angle acquisition device, system and method, and the device comprises a first detector, a second detector and a third detector which are not located on the same straight line, and a phase difference spectrum acquisition unit which is used for obtaining a corresponding phase difference spectrum according to a cross-power spectrum between any two detectors. And the incident angle determination unit randomly selects a first phase difference spectrum and a second phase difference spectrum according to the phase difference spectrum, and determines the incident angle of the plane seismic wave according to the ratio of the first phase difference spectrum to the second phase difference spectrum. The device is simple and convenient, is composed of three vertical component detectors which are not on the same straight line, is simple in calculation process, and can obtain the incident azimuth angles of the surface waves with different frequencies, which meet