The full-time electromagnetic modeling for time-domain airborne electromagnetic systems
The full-time electromagnetic modeling for time-domain airborne electromagnetic systems
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DOI：
10.6038/cjg20130928
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发表时间：
2013-09-01
影响因子：
1.4
通讯作者：
Ben Fang
中科院分区：
文献类型：
--
作者：
Yin Chang-Chun;Huang Wei;Ben Fang
近年来，许多专家致力于机载电磁系统的正演建模和反演研究。在本文中，我们对ID分层媒体和3D地球进行了建模。我们不仅计算磁响应的垂直分量，还计算磁响应的直线分量。这为机载电磁波多分量测量提供了理论基础。通过比较机载电磁系统的脉冲响应和阶跃响应，我们发现脉冲系统响应在早期存在奇异性，导致电磁建模存在稳定性问题，而阶跃系统响应是非奇异的，因此我们可以开发一种稳定的算法来计算时域机载系统的全时电磁响应。事实证明，该算法精确，并且很好地保持了磁场B与磁感应强度dB/dt之间的积分/微分关系。将算法扩展到3D模型也取得了良好的效果。
In recent years, many experts dedicated their research to the forward modeling and inversion of airborne EM systems. In this paper, we carry out the modeling for ID layered media and 3D earth. We calculate not only vertical component but also the in-line component of the magnetic responses. This offers the theoretical basis for airborne EM to have multi-component survey. After comparing the impulse response and step response for airborne EM systems, we find that the impulse system response has singularity at the early time, resulting in stability problems in the EM modeling, while the step system response is non-singular, so that we can develop a stable algorithm for the calculation of the full-time EM responses for time-domain airborne systems. It is proved that the algorithm is precise and maintains well the integral/derivative relationship between the magnetic field B and the magnetic induction dB/dt. Extending the algorithm to 3D models has also obtained good results.