中文摘要：

直升机频率域电磁系统在磁性地区的视电阻率填图，长期存在争议。以往方法，通常忽略磁性层影响，并把模型中磁导率以真空磁导率代替。但是倘若勘探地层为高磁性区域（铁磁性矿床或基性火成岩），其磁导率将会导致计算电阻率值升高。为了避免这一影响，必须先确定该地区的磁导率。针对这一问题，从均匀半空间模型出发，推导出电磁响应的理论数值解，采用汉克尔变换，得到不同磁导率，不同感应系数，不同飞行高度以及不同收发距条件下的电磁响应特征，同时分析了磁导率与电磁响应的关系以及飞行高度与电磁响应的关系，为解决磁性地区磁导率反演提供理论基础。

英文摘要：

The apparent resistivity mapping bf the helicopter frequency domain EM system in magnetic area has been a problem of long controversy. In the old Method, it usually overlooked the effect of magnetic layer and substituted maghetic permeability of free space for magnetic permeability of model, but if the prospecting areas are highly magnetic areas. The magnetic permeability can cause the value of computed apparent resistivity to be erroneously high. In order to avoid the effect, it is necessary to obtain the magnetic permeability of these areas. Based on the uniformity half space model for this problem, the authors have worked out the theoretical numerical solution of electromagnetic response and then adopted the Hankel transformation, gained the electromagnetic response character in different magnetic permeability, different induction number, different flying height and different coil separation, analyzed the relationship between the electromagnetic response character and the magnetic permeability and the relationship between the electromagnetic response character and the flying height, providing the theoretical foundation for settling the magnetic permeability inversion in magnetic areas.