Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.2172/1136094 |
报告编号 | LA-UR-14-24917 |
来源ID | OSTI ID: 1136094 |
The Effect of Ionospheric Models on Electromagnetic Pulse Locations | |
Fenimore, Edward E.; Triplett, Laurie A. | |
2014-07-01 | |
出版年 | 2014 |
语种 | 英语 |
国家 | 美国 |
领域 | 地球科学 |
英文摘要 | Locations of electromagnetic pulses (EMPs) determined by time-of-arrival (TOA) often have outliers with significantly larger errors than expected. In the past, these errors were thought to arise from high order terms in the Appleton-Hartree equation. We simulated 1000 events randomly spread around the Earth into a constellation of 22 GPS satellites. We used four different ionospheres: âsimpleâ where the time delay goes as the inverse of the frequency-squared, âfull Appleton-Hartreeâ, the âBobRD integralsâ and a full raytracing code. The simple and full Appleton-Hartree ionospheres do not show outliers whereas the BobRD and raytracing do. This strongly suggests that the cause of the outliers is not additional terms in the Appleton-Hartree equation, but rather is due to the additional path length due to refraction. A method to fix the outliers is suggested based on fitting a time to the delays calculated at the 5 GPS frequencies with BobRD and simple ionospheres. The difference in time is used as a correction to the TOAs. |
英文关键词 | IONOSPHERE |
URL | 查看原文 |
来源平台 | US Department of Energy (DOE) |
引用统计 | |
文献类型 | 科技报告 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/6736 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Fenimore, Edward E.,Triplett, Laurie A.. The Effect of Ionospheric Models on Electromagnetic Pulse Locations,2014. |
条目包含的文件 | 条目无相关文件。 |
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