The invention relates to a
line source time domain electromagnetic response numerical calculation method based on meshless method, particularly a numerical
simulation which can overcome dependence on mesh in the conventional numerical calculation method and is suitable for
time domain electromagnetic surveying under complex
terrain. In the
line source time domain electromagnetic response numerical calculation method based on meshless method, based on a
governing equation and a definite condition which the transient electromagnetic method satisfies, a generic function of a two-dimensional
line source boundary value problem is established, essential boundary conditions are loaded through a penalty method, a paraxial approximate equation is provided to eliminate
reflected waves at truncated boundaries, time
discretization is carried out through a Crack-Nicolson format, and a recurrence equation is obtained. Based on an isoparametric element thought, units with regular shape in local coordinates are discretized to be irregular solving objects of which nodes are distributed at random. The recurrence equation is solved through a
LU decomposition method, and finally, a field value of each node in a solving region is obtained. Calculation result shows that, with the method provided by the invention, a
shape function has good smoothness,
simulation precision is high,
maximum error is not more than 1*10<-3>, and electromagnetic method high-accuracy numerical calculation is realized.