...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Early-Time GPR Signal Attributes to Estimate Soil Dielectric Permittivity: A Theoretical Study
【24h】

Early-Time GPR Signal Attributes to Estimate Soil Dielectric Permittivity: A Theoretical Study

机译：估算土壤介电常数的早期GPR信号属性：理论研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

High-frequency electromagnetic (EM) surveys have shown to be valuable techniques in the study of soil water content due to the strong dependence of soil dielectric permittivity with moisture content. This quantity can be determined by analyzing the average value of the early-time instantaneous amplitude of ground-penetrating radar (GPR) traces. We demonstrate the reliability of this approach to evaluate the shallow soil water content variations from standard fixed-offset GPR data by simulating the data over different likely EM soil conditions. A linear dipole model that uses a thin-wire approximation is assumed for the transmitting and receiving antennas. The homogenous half-space model is used to calculate the waveform instantaneous amplitude values averaged over different time windows. We analyzed their correlation with the soil surface dielectric parameters, and we found a clear inverse linear dependence on the permittivity values. Moreover, we evaluated how different kinds of noise affect this correlation, and we determined the influence of the electrical conductivity on the trace attributes. Finally, through a two-layered medium, we estimated the effect on the GPR signal of a shallow reflector, we analyzed how its presence can carry out inaccuracies in the soil surface dielectric permittivity estimation, and we determined the best time window to minimize these errors.
机译：由于土壤介电常数与水分含量的强烈相关性，高频电磁（EM）调查已被证明是研究土壤水分的有价值的技术。可以通过分析探地雷达（GPR）迹线的早期瞬时振幅平均值来确定该数量。我们通过模拟不同可能的EM土壤条件下的数据，证明了该方法从标准的固定偏移GPR数据评估浅层土壤水分变化的可靠性。对于发射和接收天线，假定使用细线近似的线性偶极子模型。同质半空间模型用于计算在不同时间窗口上平均的波形瞬时振幅值。我们分析了它们与土壤表面介电参数的相关性，发现对介电常数值存在明显的线性反比关系。此外，我们评估了各种噪声如何影响这种相关性，并确定了电导率对走线属性的影响。最后，通过两层介质，我们估计了对浅反射器GPR信号的影响，我们分析了其存在如何在土壤表面介电常数估计中进行误差，并确定了将这些误差最小化的最佳时间窗口。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号