Ground penetrating radar forward modeling method based on finite field

The invention discloses a ground penetrating radar forward modeling method based on a finite field. The method comprises the following steps: constructing a ground penetrating radar finite field forward modeling model; setting the positions of a transmitting antenna and a receiving antenna, the center frequency of the transmitting antenna and a finite field boundary attenuation ratio; calculating a finite field range corresponding to the transmitting antenna; calculating finite field forward modeling parameters of the ground penetrating radar by adding a perfect matching layer; carrying out pulse source loading processing aiming at the set position of the transmitting antenna, and updating the field value of the electromagnetic field in the simulation area at the same time; updating the auxiliary field of the electromagnetic field; time steps are added, and the steps are repeated until numerical simulation of the whole time is completed; acquiring wave field data of the receiving antenna by adopting the set p