定源电磁法包括回线法和长导线法。定源电磁法的正演问题原则上可用解电磁场矢量势波动方程的方法来解决,但对某些几何形体和一些较为复杂的情况,由于数学上的困难,往往得不到严格的解,甚至于无法得到解。目前仅对典型的几何形体(球、水平圆柱体等)有了严格的解。对其他一些形体(如板状体)和较为复杂的情况,通过模型实验解 Fixed-point electromagnetic method includes the loop method and the long wire method. In principle, the forward problem of fixed-source electromagnetism can be solved by the solution of the electromagnetic field vector-wave equation of volatility. However, for some geometries and some complicated situations, due to mathematical difficulties, often no strict solution is obtained, and even Can not get solution Currently there is a strict solution to the typical geometry (balls, horizontal cylinders, etc.). For some other forms (such as plate-shaped body) and more complex cases, through the model experimental solution