Abstract : this paper describes the working principle of drillhole radar and recommends two working patterns : single - drillhole reflection and crosshole tomographic imaging . the technique was used to make lithologic evaluation of deep strata and detect geological anomalous bodies with obvious effects obtained 文摘:阐述了钻孔雷达的工作原理，介绍了单孔反射和跨孔层析成像2种工作方式，并将其用于深部岩层岩性评价和地质异常体探测，效果显著。
Based the basic principle of the accumulation of induced electric charges across the resistivity discontinuities and the induction current channeling inside the conductive bodies inspirited by the mt field , we set up the relation between the measured field on the earth surface and the distribution of the induced source underground by means of the defining the electric charge occurrence probability function and the electric dipole occurrence probability function and the spacial distributing of the " correlation probability " . the " image " of the field sources underground , or the distributing graphy of the induced electric charges and the induced current in the mesuring area can be drawed , from which we can get the outline of the geological anomaly on the meaning of the probability 大地电磁场概率成像方法是一种新的地球物理成像反演方法，它是根据在大电磁波场的激励下，地下介质电阻率间断处产生感应电荷积累和导体内部产生感应电流，从而产生感应电磁场的原理，相应地定义了感应电荷发生概率函数和感应电偶极子发生概率函数，通过“相关概率”发生的大小的空间分布，建立了地表观测场与地下场源空间分布的内在联系。地下场源分布概率的“像” ，即测区的感应电荷和感应电流的概率的分布图像，就是测区内地质体在概率意义下地质异常体的分布轮廓。
