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直升机航空瞬变电磁法一次作业覆盖面积广,数据采集量巨大,信息丰富,对于剖面成像解释有很大的优势.本文利用航空电磁数据量大的优势,采用微分电导参数与相关叠加相结合的技术,实现航空瞬变电磁快速成像解释.首先,利用等效导电平面法求取视纵向电导与视深度.然后,将纵向电导对视深度求二次导数获得微分电导参数.最后,利用相关叠加算法对微分电导数据进行合成,形成合成后的微分电导剖面,实现航空瞬变电磁相关叠加快速成像.利用文中所述的成像算法对模型数据和航空瞬变电磁实测数据进行解释分析,结果表明基于微分电导的相关叠加成像算法不仅具有很好的抗噪性,而且计算速度快可以进行实时成像,对于地下介质的电性分层具有较好的分辨,有效提高了航空瞬变电磁法的解释精度.
Helicopter airborne transient electromagnetic method has the advantages of wide operation coverage, huge amount of data acquisition and rich information, which has great advantages for the interpretation of profile imaging.Based on the advantage of large amount of aviation electromagnetic data, this paper uses the combination of differential conductance parameters and related superposition Technology to realize the rapid electromagnetic transient imaging interpretation of aviation.Firstly, the equivalent longitudinal conductivity and depth of view are calculated by the equivalent conductive plane method.And then, the derivative of the vertical derivative is obtained by calculating the derivative of the vertical derivative.Finally, Algorithm to synthesize the differential conductance data to form the synthesized differential conductance profile to realize the aerial transient electromagnetic correlation superposition and fast imaging.Using the imaging algorithm described in the text to explain and analyze the model data and the transient electromagnetic field measured data, The differential conductance correlation superposition imaging algorithm not only has good anti-noise performance, but also realizes the real-time imaging with fast calculation speed, and has good resolution for the electrical stratification of underground media and effectively improves the interpretation accuracy of the airborne transient electromagnetic method .