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首页> 外文期刊>Microwaves, Antennas & Propagation, IET >Long-range Loran-C ground-wave propagation prediction based on adaptive moving window finite-difference time-domain method with compute unified device architecture parallel computing techniques
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Long-range Loran-C ground-wave propagation prediction based on adaptive moving window finite-difference time-domain method with compute unified device architecture parallel computing techniques

机译：基于自适应移动窗口时域有限差分法的时域Loran-C地波传播预测与统一计算架构并行计算技术

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摘要

Modelling long-range Loran-C signal propagation numerically is challenging because of its extremely high computational cost. Other analytical/semi-analytical methods are not accurate enough because of unavoidable approximations. In this study, the authors put forward a solution using the adaptive moving window finite-difference time-domain (FDTD) method to compute unified device architecture parallel computing techniques. The moving velocity of the window is dependent upon the wave speed adaptively. To achieve the adaptive moving window technique, the original Loran-C signal is truncated first. A further method employed to extract the electric field amplitude and phase is proposed. The electric field amplitude and phase data of each mesh in the computational space are synchronously obtained from the spatial domain as the FDTD updates, without additional storage cost and post processing in the time domain. With all these efforts, a 400 km propagation path was simulated successfully within 22 min. Measurement results between Jinxian and Shangrao in Jiangxi Province, China were taken to validate the numerical approach.
机译：数字化远程Loran-C信号传播的建模非常困难，因为它的计算成本非常高。由于不可避免的近似，其他分析/半分析方法不够准确。在这项研究中，作者提出了一种使用自适应移动窗口时域有限差分（FDTD）方法计算统一设备架构并行计算技术的解决方案。窗口的移动速度自适应地取决于波速。为了实现自适应移动窗口技术，首先将原始的Loran-C信号截断。提出了用于提取电场幅度和相位的另一种方法。随着FDTD的更新，可以从空间域同步获取计算空间中每个网格的电场幅度和相位数据，而无需在时域进行额外的存储成本和后处理。通过所有这些努力，在22分钟内成功模拟了400 km的传播路径。采取了江西省晋县和上饶之间的测量结果来验证数值方法。

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