Mathematical model of submarine′s magnetic field extrapolation;

In order to master the submarine s magnetic field distribution in the air completely and exactly,and study the submarine s magnetic-concealed performance,the mathematics model of submarine s magnetic field extrapolation was built by using boundary element method.

In order to effectively overcome the difficulties,which are often met in magnetic field extrapolation by traditional continuation methods, a direct model for magnetic field extrapolation based on equivalent surface magnetic charge intensity was derived from the boundary theory.

Wave equation datuming by wave field extrapolation based on hybrid method;

The algorithm uses the technology of wave field extrapolation and the wave equation migration by finite difference approach,which can be used in common offset gathers,for 3D material requires common offset gathers with the same azimut.

In this paper, the method of wave field extrapolation and decomposition of seismic compound wave in viscoeleastic medium is presented, based on wave equation.

Near offset wavefield extrapolation based on parabolic Radon transform;

Influence of aperture angle on precision of 3D wavefield extrapolation.;

The result shows that the alternating direction implicit method is fast but causes distortion in wave field extrapolation and affects image accuracy;however LU decomposition and inverse operator approach methods are fast while holding circular symmetry of wave field,and are promising in oilfield exploration and develo.