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首页> 外文期刊>GPS Solutions >Comparison of 4D tomographic mapping versus thin-shell approximation for ionospheric delay corrections for single-frequency GPS receivers over North America
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Comparison of 4D tomographic mapping versus thin-shell approximation for ionospheric delay corrections for single-frequency GPS receivers over North America

机译：北美单频GPS接收机电离层延迟校正的4D层析成像映射与薄壳近似的比较

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摘要

The majority of navigation satellite receivers operate on a single frequency. They compensate for the ionospheric delay using either an ionospheric model which typically only corrects for 50% of the delay or a thin-shell map of the ionosphere. A 4D tomographic imaging technique is used to map the free electron density over the full-height of the ionosphere above North America during autumn 2003. The navigation solutions computed using correction based upon the thin-shell and the full-height maps are compared in this paper. The maps are used to calculate the excess propagation delay on the L1 frequency experienced by GPS receivers at selected locations across North America. The excess delay is applied to correct the single-frequency pseudorange observations at each location, and the improvements to the resulting positioning are calculated. It is shown that the thin-shell and full-height maps perform almost as well as a dual-frequency carrier-smoothed benchmark and for most receivers better than the unfiltered dual-frequency benchmark. The full-height corrections perform well and are considerably better than thin-shell corrections under extreme storm conditions.
机译：大多数导航卫星接收机在单个频率上运行。它们使用通常只校正50％延迟的电离层模型或电离层的薄壳图来补偿电离层延迟。在2003年秋季期间，使用4D断层成像技术绘制了北美上空电离层全高的自由电子密度图。在此方法中，比较了基于薄壳图和全高图进行校正而得出的导航解。纸。这些地图用于计算GPS接收器在北美选定位置经历的L1频率上的多余传播延迟。应用多余的延迟来校正每个位置的单频伪距观测值，并计算对所得定位的改进。结果表明，薄壳图和全高图的性能几乎与双频载波平滑基准相同，并且对于大多数接收机而言，其性能优于未滤波的双频基准。在极端风暴条件下，全高改正效果很好，并且比薄壳改正好得多。

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