6 results about "Diffraction" patented technology

The invention relates to the technical field of seismic exploration data processing methods, and particularly discloses a velocity analysis method and device using imaging domain diffraction energy envelope, and the method comprises the steps: carrying out the migration imaging of a seismic data volume at a batch displacement velocity, and obtaining a pre-stack migration velocity; performing imaging envelope calculation by using the pre-stack migration velocity; and carrying out interactive speed analysis on a result of the imaging envelope calculation, and selecting a proper pre-stack migration speed. The invention provides an imaging gather envelope calculation method based on image cross-correlation, velocity analysis is carried out according to the focusing degree of diffracted energy at different velocities, technical support is provided for accurate velocity interpretation of an underground geologic body, and the problem that conventional migration velocity analysis depends on a reflected wave field and is not accurate is solved. And the diffracted waves are more sensitive to the reaction of the speed.

The application discloses a bridge site area concealed geological anomaly body exploration method based on a hole-in-fall weight seismic source, a receiving survey line is laid out in a bridge drilling construction survey area, a standard penetration test or a conical dynamic penetration probe ramming rock-soil layer vibration is used as a seismic exploration seismic source in in-situ drilling test, a plurality of three-component seismic detectors are laid out along a bridge longitudinal section or a transverse section axis where the drilling is located and receive the vibration signals, single-shot seismic records are formed by collating, a diffraction wave event horizon generated by a concealed geological anomaly body is identified, a diffraction wave is extracted by using time-frequency conversion and a polarization parameter is solved, a diffraction wave propagation space line is constructed based on a rectangular coordinate, a diffraction wave propagation path nearest point coordinate of a detector pair is determined by using a space straight line projection method, and an inversion result profile is formed by a discrete grid point number statistical heat map, a diffraction wave occurrence position is identified, and the concealed geological anomaly body is explained.

The invention discloses a design method of a parabolic cylinder mixed curled edge reflecting surface, and relates to the technical field of antenna reflecting surface design. According to the method, a parabolic cylinder with a concave edge projection contour is constructed in a central main reflection area, and a mixed curled edge formed by mixing an elliptic curve and an equivalent parabola through a mixing function is constructed on the peripheral edge of the parabolic cylinder. The method comprises the following steps: calculating equivalent parabolas of different azimuth angles under a cylindrical coordinate system taking the center of a reflecting surface as an original point, establishing a local coordinate system at a connection point, respectively constructing an elliptic curve and an equivalent parabolic equation, and finally generating a mixed hemming curve equation through a mixed function. According to the invention, the continuity of the reflecting surface at the joint of the main area and the curled edge can be obviously improved, the edge diffraction is effectively reduced, the diffracted wave is guided backwards to the back surface of the reflecting surface, the disturbance to a quiet area field is reduced, and the test precision and reliability of a compact range test system are improved.

This application provides an imaging method, apparatus, and equipment for obstacles in a shield tunneling construction area, relating to the field of geological exploration technology for shield tunneling construction. The method includes: acquiring seismic exploration data of the target shield tunneling construction area; obtaining an initial number of modes based on a configuration, performing geometric mode decomposition on the seismic exploration data to obtain multiple initial mode components; calculating a comprehensive score for each initial mode component; calculating a fitness value corresponding to the initial number of modes based on each initial mode component and its corresponding comprehensive score; adaptively optimizing the initial number of modes within a configured mode search interval based on the fitness value corresponding to the initial number of modes to obtain an optimal number of modes; if the initial number of modes is the optimal number, reconstructing the initial diffraction components to obtain a diffraction wavefield; and performing migration imaging on the diffraction wavefield to obtain the imaging result of obstacles in the target shield tunneling construction area. This application can improve the detection accuracy and stability of obstacles in front of the shield tunneling construction area.