Airborne Transient Electromagnetic Simulation: Detecting geoelectric structures for HVdc monopole operation

Li, Ruiheng; Yu, Nian; Wang, Enci; Wang, Xuben; Mao, Lifeng; Sun, Zhibo; Wu, Xialan

doi:10.1109/mgrs.2021.3097325

Cited by 5 publications

(6 citation statements)

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“…When inversion is performed using the traditional gradient class method [16,17], and when the initial geoelectric structure is a uniform half-space model, it is difficult to find the geoelectric structure that makes a TEM signal appear in the wrong direction (Figure 2a) during the inversion process, and the predicted geoelectric structure cannot be close to the preset structure (Figure 2b). The optimization process is stalled.…”

Section: Inverse With Ip Effectmentioning

confidence: 99%

Enhanced Whale Optimization Algorithm for Improved Transient Electromagnetic Inversion in the Presence of Induced Polarization Effects

Li,

Di,

Zuo

et al. 2023

Mathematics

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The transient electromagnetic (TEM) method is a non-contact technique used to identify underground structures, commonly used in mineral resource exploration. However, the induced polarization (IP) will increase the nonlinearity of TEM inversion, and it is difficult to predict the geoelectric structure from TEM response signals in conventional gradient inversion. We select a heuristic algorithm suitable for nonlinear inversion—a whale optimization algorithm to perform TEM inversion with an IP effect. The inverse framework is optimized by opposition-based learning (OBL) and an adaptive weighted factor (AWF). OBL improves initial population distribution for better global search, while the AWF replaces random operators to balance global and local search, enhancing solution accuracy and ensuring stable convergence. Tests on layered geoelectric models demonstrate that our improved WOA effectively reconstructs geoelectric structures, extracts IP information, and performs robustly in noisy environments. Compared to other nonlinear inversion methods, our proposed approach shows superior convergence and accuracy, effectively extracting IP information from TEM signals, with an error of less than 8%.

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Section: Inverse With Ip Effectmentioning

confidence: 99%

Enhanced Whale Optimization Algorithm for Improved Transient Electromagnetic Inversion in the Presence of Induced Polarization Effects

Li,

Di,

Zuo

et al. 2023

Mathematics

Self Cite

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show abstract

“…When inversion is performed using the traditional gradient class method [15,51] when the initial geoelectric structure is a uniform half-space model, it is difficult to find the geoelectric structure that makes the TEM signal appear in the wrong direction (Figure 1a) during the inversion process, and the predicted geoelectric structure cannot be close to the preset structure (Figure 1b). The optimization process is stalled.…”

Section: Ip Effect On Inversionmentioning

confidence: 99%

“…The inversion results of the proposed method are compared with those of the traditional gradient inversion method, as illustrated in Figure 12. The traditional gradient inversion method employs OCCAM inversion [51], and the specific implementation and inversion termination strategy are referenced from the literature. Due to the absence of a strategy for optimizing polarization parameters, the inversion results at y = 70 m and y = 110 m in the gradient inversion show an inability to accurately recover the predefined geoelectric structure of SMS.…”

Section: Complex Modelmentioning

confidence: 99%

TEM Strata Inversion Imaging with IP Effect Based on Enhanced GCN by Extracting Long-Dependency Features

Li,

Di,

Tian

et al. 2023

Electronics

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Utilizing neural network models to inverse time-domain electromagnetic signals enables rapid acquisition of electrical structures, a non-intrusive method widely applied in geological and environmental surveys. However, traditional multi-layer perceptron (MLP) feature extraction is limited, struggling with cases involving complex electrical media with induced polarization effects, thereby limiting the inversion model’s predictive capacity. A graph-topology-based neural network model for strata electrical structure imaging with long-dependency feature extraction was proposed. We employ graph convolutional networks (GCN) for capturing non-Euclidean features like resistivity-thickness coupling and Long Short-Term Memory (LSTM) to capture long-dependency features. The LSTM compensates for GCN’s constraints in capturing distant node relationships. Using case studies with 5-strata and 9-strata resistivity models containing induced polarization effects, compared to traditional MLP networks, the proposed model utilizing time-domain features and graph-topology-based electrical structure extraction significantly improves performance. The mean absolute error in inversion misfit is reduced from 10–20% to around 2–3%.

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“…High-efficiency and low-cost detection methods for extreme harsh environments have become important research directions in the field of geophysical exploration. Airborne transient electromagnetic method (ATEM) is an important geophysical exploration method with the advantages of fast exploration speed and low detection cost [1,2] and has been widely * Author to whom any correspondence should be addressed. used in geological investigation [3] as well as environmental evaluation [4].…”

Section: Introductionmentioning

confidence: 99%

Combined wave emission system based on dual resonance method for airborne transient electromagnetic detection

Zhang

Pang

Liu

et al. 2023

Meas. Sci. Technol.

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To improve the detection efficiency of airborne transient electromagnetic method (ATEM) and reduce the times of flight experiment, a dual resonance-based combined wave emission circuit is proposed in this paper, which realizes the combined emission of half-sine wave and triangular wave through the selection of different resonant branches. Based on the operating principle of the proposed emission circuit, the model of second-order RLC equivalent circuit is established. Then, the generation process of the combined wave is analyzed, and the segmentation control method is proposed. Finally, the feasibility and effectiveness of the proposed combined wave emission system are verified by simulation model building and prototype testing, and the results show that the emission current is of good quality and high stability. Compared with the traditional emission of single wave current, the combined wave current has the advantages of large magnetic moment of half-sine wave and rich high frequency components of triangular narrow pulse, which can effectively expand the detection range and improve the measurement efficiency of ATEM.

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Airborne Transient Electromagnetic Simulation: Detecting geoelectric structures for HVdc monopole operation

Cited by 5 publications

References 0 publications

Enhanced Whale Optimization Algorithm for Improved Transient Electromagnetic Inversion in the Presence of Induced Polarization Effects

Enhanced Whale Optimization Algorithm for Improved Transient Electromagnetic Inversion in the Presence of Induced Polarization Effects

TEM Strata Inversion Imaging with IP Effect Based on Enhanced GCN by Extracting Long-Dependency Features

Combined wave emission system based on dual resonance method for airborne transient electromagnetic detection

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