Quality assessment of CNES real-time ionospheric products
Quality assessment of CNES real-time ionospheric products
复制标题
CNES实时电离层产品的质量评估
DOI：
10.1007/s10291-018-0802-2
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发表时间：
2018-11
期刊：
影响因子：
4.9
通讯作者：
Wang Zhenjie
中科院分区：
文献类型：
--
作者：
Nie Zhixi;Yang Hongzhou;Zhou Peiyuan;Gao Yang;Wang Zhenjie
实时单频精确点定位（RT-SF-PPP）已成为一种理想的定位方法，因为它可以用低成本的全球导航卫星系统（GNSS）芯片组或接收器实现高定位精度。在单频精确点定位（SF-PPP）应用中，电离层延迟是主要的误差源，因此电离层产品的质量对SF-PPP的性能至关重要。为满足RT-SF-PPP用户的需求，国际GNSS业务（IGS）计划提供开放接入的实时电离层产品。到目前为止，……国家Études空间中心（CNES）是唯一通过其实时服务（RTS）广播实时电离层垂直总电子含量（VTEC）信息的IGS分析中心（AC）。CNES实时电离层产品的质量越来越受到全球导航卫星系统界的关注。在电离层校正域和定位域对CNES实时VTEC信息的质量进行了评价。首先，收集了连续374天的CNES VTEC产品，并与IGS最终的全球电离层图（GIM）产品进行了比较。其次，利用CNES VTEC信息计算的倾斜总电子含量（STEC）与双频GNSS测量得出的STEC进行了全面评估。最后，利用RT-SF-PPP对CNES实时电离层产品在定位域的质量进行评估。在收集数据的时间跨度内，CNES VTEC消息中传播的球谐展开的度和阶数从6变化到12，在上述实验中同时研究了更高的度和阶数参数的影响。
Real-time single-frequency precise point positioning (RT-SF-PPP) has become a desired positioning approach because it can achieve high positioning accuracy with a low-cost global navigation satellite system (GNSS) chipset or receiver. For single-frequency precise point positioning (SF-PPP) applications, the ionospheric delay is a dominant error source, and thus the quality of applied ionospheric products is critical to the performance of SF-PPP. To meet the demands of the RT-SF-PPP users, the international GNSS service (IGS) is planning to provide open-access real-time ionospheric products. By now, the .Centre National d’Études Spatiales (CNES) is the only IGS analysis center (AC) to broadcast real-time ionospheric vertical total electron content (VTEC) message through its real-time service (RTS). The quality of the CNES real-time ionospheric products is drawing increasing attention from the GNSS community. We evaluate the quality of CNES real-time VTEC message both in the ionospheric correction domain and positioning domain. First, 374 consecutive days of CNES VTEC products are collected and compared with the IGS final global ionospheric map (GIM) products. Second, slant total electron content (STEC) computed with CNES VTEC message is fully assessed with respect to STEC derived from dual-frequency GNSS measurements. Finally, RT-SF-PPP is conducted for assessing the quality of CNES real-time ionospheric products in the positioning domain. The degree and order of the spherical harmonic expansions broadcasted in the CNES VTEC messages changed from 6 to 12 in the time span of collected data, the effects of higher degree and order parameters are investigated at the same time in the experiments above.
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