FDTD Medium Dimension Selection Guidelines for GPR Synthetic Data Generation

Noushin Khosravi Largani;Seyed Zekavat;Himan Namdari
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Abstract

Ground-penetrating radar (GPR) has been traditionally used for subsurface assessment. In many applications, such as precision agriculture via drone-borne radar, it is critical to use machine learning (ML) techniques to map GPR received signals into soil subsurface moisture and texture. Supervised ML methods need a large number of labeled data for their training process which is expensive and time-consuming to attain through actual field measurements. The gprMax software, which is created based on the finite difference time domain (FDTD) method, has been introduced as a reliable tool to emulate soil media and create synthetic labeled data. Proper selection of gprMax soil medium dimensions is critical to the generation of reliable synthetic data. The selection of large soil medium dimensions for gprMax emulations leads to synthetic data consistent with realistic scenarios. However, larger medium dimensions lead to higher computation complexity. This letter investigates and validates a proper selection of medium dimensions that maintains a tradeoff across the accuracy and computational complexity of creating synthetic data. The results of this study are critical to researchers who adopt gprMax or any FDTD-oriented emulations for soil subsurface assessment. To maintain a tradeoff between accuracy and complexity, the letter confirms that the minimum medium surface dimension should be in the order of 1.5 times the maximum wavelength.
探地雷达合成数据生成的FDTD中维选择指南
探地雷达(GPR)传统上用于地下评估。在许多应用中,例如通过无人机雷达进行精准农业,使用机器学习(ML)技术将GPR接收的信号映射到土壤地下水分和质地中是至关重要的。监督式机器学习方法在训练过程中需要大量的标记数据,通过实际的现场测量来获得这些数据既昂贵又耗时。本文介绍了基于时域有限差分(FDTD)方法的gprMax软件,作为模拟土壤介质和生成合成标记数据的可靠工具。正确选择gprMax土壤介质尺寸对生成可靠的综合数据至关重要。gprMax模拟选择大土壤介质尺寸,使合成数据与现实场景一致。然而,更大的中维会导致更高的计算复杂度。这封信调查并验证了中等维度的适当选择,以保持创建合成数据的准确性和计算复杂性之间的权衡。本研究结果对于采用gprMax或任何面向fdtd的模拟进行土壤地下评价的研究人员至关重要。为了在精度和复杂性之间保持平衡,该信函确认最小介质表面尺寸应该是最大波长的1.5倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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