多波发射时间域航空电磁系统数据处理及正反演研究

发布时间：2018-03-27 16:29

本文选题：航空电磁　切入点：数据处理　出处：《吉林大学》2015年硕士论文

【摘要】：时间域航空电磁法原始实测数据量庞大且易受噪声影响，因此需要有效的数据预处理方法来精简数据量，提高信噪比。本文对时间域航空电磁法数据处理进行研究和总结，内容包括时间域和频率域的数据预处理，数据处理，成像，正演模拟，反演解释等模块，并且将其集成到可视化软件平台。通过该软件可以实现航空电磁实测数据处理与解释。传统的时间域航空电磁发射系统通过发射单一波形完成航空电磁勘探任务，本文研究在原先单一波形衰减殆尽时，再发射一段小能量的方波，，以便接收线圈在一个半周期可以同时接收两个波形的衰减信号。本文从传统波形特点、频谱、相对异常正演计算、理论数据反演、实测数反演据等5个角度说明该套双波形发射接收系统的特点。本文首先从传统波形的衰减特点和数据处理方法上证明了发射小方波的可行性，从频谱分析角度说明增加小方波可以增加原波形的高频成分，说明双波形对于浅层有更高的分辨率。然后，从麦克斯韦方程组出发推导出任意波形的正演响应计算公式，从而计算出双波形的电磁响应。通过计算对于不同模型的双波形响应说明方波对于浅层异常体可提供更大的相对异常。最后，本文通过反演理论模型和实测数据证明与传统的单一正弦波相比，双波形在保持对深部勘测的能力下，可以提高对浅地表电性的分辨率。
[Abstract]:Time domain airborne electromagnetic method the original data is huge and easily affected by noise, therefore need preprocessing method to streamline data effectively, improve the signal-to-noise ratio. In this paper, the time domain airborne electromagnetic data processing method are studied and summarized, data preprocessing, including time domain and frequency domain data processing, imaging, forward modeling, inversion module, and integrated into the visualization software platform. The software can realize the airborne electromagnetic measurement data processing and interpretation.
The traditional time domain airborne electromagnetic launch system to complete the task by transmitting single waveform airborne electromagnetic exploration, this paper studies on the original single wave attenuation out, and then launch a small energy Fang Bo, in order to receive coil in the 1.5 cycle can receive two waveform signal attenuation. This article from the traditional waveform characteristics, spectrum, relative positive anomaly the theory calculation, data inversion, inversion according to the number of actual 5 angles that the double wave transmitting and receiving system.
This paper from the attenuation characteristics and data processing method of the traditional waveform demonstrates the feasibility of launching small Fang Bo, from the point of view that a small increase in spectral analysis of square wave can increase the high frequency components of the original waveform, indicating double waveform has higher resolution for the shallow layer. Then, starting from the Maxwell equations are derived for arbitrary waveform forward the response calculation formula to calculate the electromagnetic wave response. Through the calculation of two different models for double wave response that square wave for shallow anomaly can provide greater relative anomaly. Finally, this paper through the inversion of single sine wave theory model and measured data show that compared with the traditional double waveform in the ability to keep on deep Department of surveying, can improve the resolution of shallow surface electricity.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.326

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