Ionospheric delay corrections for single-frequency GPS receivers over Europe using tomographic mapping
Ionospheric delay corrections for single-frequency GPS receivers over Europe using tomographic mapping
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DOI：
10.1007/s10291-008-0107-y
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发表时间：
2009-03-01
期刊：
影响因子：
4.9
通讯作者：
Mitchell, Cathryn N.
中科院分区：
文献类型：
--
作者：
Allain, Damien J.;Mitchell, Cathryn N.
大多数导航卫星接收器工作在单一频率上，并由于电离层延迟而产生定位误差。这可以使用本文中比较的各种方法进行补偿。这项研究的重点是最近的太阳活动高峰期。一个4D层析成像技术被用来映射电离层电子密度在2002年和2003年期间的欧洲地区。电子密度图，然后用于计算在整个欧洲的选定位置的GPS接收机所经历的L1频率上的多余的传播延迟。多余的延迟被应用于校正每个位置处的伪距单频观测值，并且计算对所得到的定位的改进。实时层析成像技术给出的导航解决方案，比经验建模方法和方法的准确性的完整的双频解决方案。定位精度的提高每天都有不同，取决于电离层的状况，但在欧洲中纬度的这些太阳活动最大期，中午的提高幅度可达25米。
The majority of navigation satellites receivers operate on a single frequency and experience a positioning error due to the ionospheric delay. This can be compensated for using a variety of approaches that are compared in this paper. The study focuses on the last solar maximum. A 4D tomographic imaging technique is used to map the ionospheric electron density over the European region during 2002 and 2003. The electron density maps are then used to calculate the excess propagation delay on the L1 frequency experienced by GPS receivers at selected locations across Europe. The excess delay is applied to correct the pseudo-range single frequency observations at each location and the improvements to the resulting positioning are calculated. The real-time tomographic technique is shown to give navigation solutions that are better than empirical modelling methods and approach the accuracy of the full dual-frequency solution. The improvements in positioning accuracy vary from day to day depending on ionospheric conditions but can be up to 25 m during mid-day during these solar maximum conditions at European mid-latitudes.