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位场相关成像是根据实测异常与地下不同位置地质体所产生异常之间的相关系数来快速获得地质体的空间位置.现有的相关成像方法是利用球体模型来模拟地下地质体的形状,当场源体的实际形状与球体相差较大时,计算结果势必出现较大误差.为了解决这一问题,对该方法进行改进,以不同模型来模拟地下地质体形状,计算其产生异常与实测数据的相关系数,理论上使相关系数取得最大值的模型与实际地质体情况一致.因此,改进后的方法不仅可以获得地质体的位置参数,还可以对地质体的类型(构造指数)进行估计.磁异常的相关成像计算采用异常的解析信号来完成,这样可有效地避免磁化方向的干扰,且计算公式相对简单.通过理论模型试验,证明此方法可以成功地完成位场数据的反演工作,且稳定性较高.最后将其应用于上海实测磁异常数据的解释中,获得了地下未爆炸物的分布情况.
Field-related imaging is based on the correlation coefficient between the measured anomalies and the anomalies generated by the geologic bodies in different places to obtain the spatial position of the geological bodies quickly.Existing related imaging methods use the spherical model to simulate the shape of underground geological bodies, When the difference between the actual shape of the source body and the sphere is large, the calculation result will inevitably have a big error.In order to solve this problem, this method is improved to simulate the shape of the underground geological body with different models and to calculate the abnormality and the measured data The correlation coefficient and the theoretic model that maximizes the correlation coefficient are consistent with the actual geologic body.Therefore, the improved method can not only obtain the location parameters of the geological body, but also can estimate the type of geological body (structural index). Abnormal correlation imaging is performed by using anomalous analytical signals, which can effectively avoid the interference of magnetization direction, and the calculation formula is relatively simple. The theoretical model test proves that this method can successfully complete the inversion of the field data Its stability is higher.Finally it is applied to the interpretation of the measured magnetic anomaly data in Shanghai, Distribution thereof.