基于菲涅爾帶理論的無線電波層析正則化方法研究
[Abstract]:Radio wave perspective method is one of the commonly used methods to detect geological structure in coal face. At present, the combined algebraic reconstruction (SIRT) tomography method based on ray theory is used to retrieve the attenuation coefficient of electromagnetic wave in coal mine. Because the frequency range of electromagnetic wave is from several hundred to several megahertz, the ray theory based on high frequency approximation has limitations in simulating electromagnetic wave propagation, but the SIRT method itself is limited by mine observation mode. The resolution of inversion in vertical line direction is not high. In this paper, the forward modeling method based on Fresnel band theory is studied. The higher the frequency of electromagnetic wave is, the smaller the radius of the first Fresnel band is, that is, the closer the ray condition is. In this paper, the constrained regularization method is used for tomography, and the minimization problem expression of Tikhonov regularization is derived. The function and significance of the regularization parameters are explained, and the optimal compromise solution is obtained by iterative inversion method. Experiments on different anomalous models and actual data show that the theoretical resolution of Fresnel band of low-frequency electromagnetic wave is better than that of ray theory, and the regularization method has better resolution. The identified anomaly structure is basically consistent with the known suspected structure location, which shows its feasibility in practical application.
【作者單位】: 國土資源部海底礦產(chǎn)資源重點(diǎn)實(shí)驗(yàn)室;中國地質(zhì)調(diào)查局廣州海洋地質(zhì)調(diào)查局;中國地質(zhì)大學(xué)(北京);
【基金】:國家自然科學(xué)基金(40804024) 海西(平潭-湄洲灣)海岸帶綜合地質(zhì)調(diào)查(GZH201400211)聯(lián)合資助
【分類號(hào)】:TD163.1;P631.3
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