Combined pulse source electromagnetic detection method and device for grounding grid topological structure

The invention discloses a combined pulse source electromagnetic detection method and device for a grounding grid topological structure; the device comprises a combined pulse source electromagnetic transmitter, a two-component magnetic field receiving coil combination, and an upper computer which is connected with a two-component magnetic field receiving coil through a receiver. The combined pulse source electromagnetic transmitter is connected with the grounding grid through at least three grounding down leads; the pulse source electromagnetic transmitter injects bipolar steep pulse current into the grounding grid through the grounding down lead; the two-component magnetic field receiving coil acquires a pulse magnetic field signal generated by a grounding grid and converts the pulse magnetic field signal into a corresponding induced voltage signal. The receiver acquires an induced voltage signal of the two-component magnetic field receiving coil, converts the induced voltage signal into a data signal and tra