关键词 :大地电磁测深 ;传输信号 ;经验模态分解中图分类号 :P631.325 文献标识码 :A 文章编号 :1002-5065(2018)09-0294-2Time frequency analysis of high frequency magnetotelluric sounding data based on EH4YIN Kang-jin(Yunnan Fuxin zinc Xin Investment Limited by Share Ltd,Kunming 650000,China)Abstract: With the continuous development of science and technology, advanced technologies such as EH4 high frequency magnetotelluric sounding technology have been gradually opened, which have been applied to the geophysical prospecting work of metal mining and have achieved good application results. Based on this, this paper first analyzes the basic principle of EH4 high frequency magnetotelluric sounding from the three aspects of the exploration mechanism, the equation group and linear polarization wave and the apparent resistivity, and studies the reading mode of the EH4 high frequency magnetotelluric data sequence, and puts forward the effective and feasible time frequency analysis method of the EH4 high frequency magnetotelluric data.Keywords: magnetotelluric sounding; transmission signal; empirical mode decomposition