多波發(fā)射時間域航空電磁系統(tǒng)數(shù)據(jù)處理及正反演研究
本文選題:航空電磁 切入點(diǎn):數(shù)據(jù)處理 出處:《吉林大學(xué)》2015年碩士論文
【摘要】:時間域航空電磁法原始實(shí)測數(shù)據(jù)量龐大且易受噪聲影響,因此需要有效的數(shù)據(jù)預(yù)處理方法來精簡數(shù)據(jù)量,提高信噪比。本文對時間域航空電磁法數(shù)據(jù)處理進(jìn)行研究和總結(jié),內(nèi)容包括時間域和頻率域的數(shù)據(jù)預(yù)處理,數(shù)據(jù)處理,成像,正演模擬,反演解釋等模塊,并且將其集成到可視化軟件平臺。通過該軟件可以實(shí)現(xiàn)航空電磁實(shí)測數(shù)據(jù)處理與解釋。 傳統(tǒng)的時間域航空電磁發(fā)射系統(tǒng)通過發(fā)射單一波形完成航空電磁勘探任務(wù),本文研究在原先單一波形衰減殆盡時,再發(fā)射一段小能量的方波,,以便接收線圈在一個半周期可以同時接收兩個波形的衰減信號。本文從傳統(tǒng)波形特點(diǎn)、頻譜、相對異常正演計(jì)算、理論數(shù)據(jù)反演、實(shí)測數(shù)反演據(jù)等5個角度說明該套雙波形發(fā)射接收系統(tǒng)的特點(diǎn)。 本文首先從傳統(tǒng)波形的衰減特點(diǎn)和數(shù)據(jù)處理方法上證明了發(fā)射小方波的可行性,從頻譜分析角度說明增加小方波可以增加原波形的高頻成分,說明雙波形對于淺層有更高的分辨率。然后,從麥克斯韋方程組出發(fā)推導(dǎo)出任意波形的正演響應(yīng)計(jì)算公式,從而計(jì)算出雙波形的電磁響應(yīng)。通過計(jì)算對于不同模型的雙波形響應(yīng)說明方波對于淺層異常體可提供更大的相對異常。最后,本文通過反演理論模型和實(shí)測數(shù)據(jù)證明與傳統(tǒng)的單一正弦波相比,雙波形在保持對深部勘測的能力下,可以提高對淺地表電性的分辨率。
[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.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:P631.326
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