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本文在对电磁场成像技术进行系统研究和总结的基础上，分析综述了大地电磁场成像技术的研究现状与存在问题，进而提出了改进的有限差分法大地电磁场偏移成像技术，使差分方程精度和成像分辨率得到了提高，并对客观选取背景电导率、两种极化模式联合成像以及多参数和再次成像进行了创新研究，最后利用模型试验和实际大地电磁场资料的实例展示了该方法偏移成像的成果及其实用性。
Based on the systematic study and summary of electromagnetic field imaging technology, this paper analyzes and summarizes the research status and existing problems of the electromagnetic field imaging technology in the earth, then advances the improved finite difference method of the earth magnetic field migration imaging technology to make the differential equation accuracy and imaging The resolution has been improved, and the objective selection of background conductivity, joint imaging of the two polarization modes and the multi-parameter and re-imaging were studied. Finally, the model migration experiment and actual geomagnetic field data were used to demonstrate the migration imaging The results and practicality.