Quality assessment of multi-GNSS orbits and clocks for real-time precise point positioning
Quality assessment of multi-GNSS orbits and clocks for real-time precise point positioning
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DOI：
10.1007/s10291-017-0678-6
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发表时间：
2017-11-06
期刊：
影响因子：
4.9
通讯作者：
Hadas, Tomasz
中科院分区：
文献类型：
--
作者：
Kazmierski, Kamil;Sosnica, Krzysztof;Hadas, Tomasz
全球导航卫星系统（GNSS）卫星数量的增加及其不断现代化使得定位精度得以提高，并能够在具有挑战性的环境中进行GNSS测量。自2016年以来，法国国家空间研究中心（CNES）一直在为所有GNSS提供实时校正，因此可以在真实的时间内实现实际的多GNSS精确点定位，而不会出现与IGS最终产品的轨道和时钟产品延迟相关的任何问题。我们提供了一个全面的评价的可用性和质量的多GNSS实时轨道和时钟产品通过比较最终中心的轨道确定在欧洲（CODE）的轨道，拟合长的连续轨道弧，分析轨道位置的差异，相对于卫星激光测距观测，以及评估时钟的稳定性，使用修改后的Allan偏差图。与CODE产品相比，GPS、GLONASS、Galileo、BeiDou MEO和BeiDou IGSO在1个月测试期内的3D轨道RMS分别为5、10、18、18和36厘米。北斗地球静止轨道的误差在1米以上。最后，我们发现，轨道和时钟的质量是卫星系统，轨道平面和轨道平面上方的太阳高度，卫星高度，以及卫星块和代的函数。
An increasing number of satellites of global navigation satellite systems (GNSS) and their constant modernization allow improving positioning accuracy and enable performing the GNSS measurements in challenging environments. Since 2016, the Centre National d'Etudes Spatiales (CNES) has been providing real-time corrections for all GNSS and thus allows for the actual multi-GNSS precise point positioning in real time without any issues associated with the latency of orbit and clock products as in the case of the IGS final products. We provide a comprehensive evaluation of the availability and the quality of multi-GNSS real-time orbit and clock products through the comparison to the final Center for Orbit Determination in Europe (CODE) orbits, fitting long continuous orbital arcs, analyzing the orbit position differences with respect to satellite laser ranging observations, as well as the assessment of clock stability using modified Allan deviation diagrams. The 3D orbit RMS over a 1-month test period, when compared to CODE products, is 5, 10, 18, 18 and 36 cm for GPS, GLONASS, Galileo, BeiDou MEO and BeiDou IGSO, respectively. The error of BeiDou geostationary orbits is above the 1-m level. Finally, we found that the quality of orbits and clocks is a function of the satellite system, orbital plane and the elevation of the Sun above the orbital plane, the satellite altitude, as well as the satellite block and generation.