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为了解观测面以下位场场源体产生的异常，设计了一种波数域的滤波器，该滤波器可在无需岩石物性资料的前提下用于位场数据的反演．对位场资料用解析法和差分法上、下延拓，以消除浅表干扰源的影响，并最后下延至观测面以下，根据下延后场的极值确定场源的质心深度．理论模型的试算和实际资料的处理均获得了令人满意的效果．
In order to understand the anomaly generated by field sources below the observing surface, a wave number domain filter was designed, which can be used for the inversion of the field data without the petrophysical data. Using the analytic method and the differential method, the data of the potential field are extended upwards and downwards to eliminate the influence of superficial interference sources, and finally down to below the observation surface. The depth of the center of mass of the field source is determined according to the extremum of the post-delay field. Trial calculation of the theoretical model and the actual data processing have obtained satisfactory results.