Improving integrated precise orbit determination of GPS, GLONASS, BDS and Galileo through integer ambiguity resolution
Improving integrated precise orbit determination of GPS, GLONASS, BDS and Galileo through integer ambiguity resolution
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通过整数模糊度分辨率提高GPS、GLONASS、BDS和Galileo的综合精确定轨能力
DOI：
10.1007/s10291-019-0830-6
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发表时间：
2019-04
期刊：
影响因子：
4.9
通讯作者：
Zhou Xingyu
中科院分区：
文献类型：
--
作者：
An Xiangdong;Meng Xiaolin;Chen Hua;Jiang Weiping;Xi Ruijie;Chen Qusen;Zhou Xingyu
2018年12月27日，中国卫星导航办公室宣布，北斗三号初步系统建成，可提供全球服务。在此之前，GPS和GLONASS是仅有的两个支持全球定位服务的全球导航卫星系统(GNSS)，共有50多颗卫星在正常运行。此外，伽利略计划在2020年左右达到其完整的星座。到那时，可用的GNSS卫星将增加到100多颗，这为高精度定位和定轨带来了机遇和挑战。整周模糊度解算(AR)可以显著提高轨道的精度，尤其是对GLONASS和BDS来说，由于频率间的偏差和卫星引起的码偏差，整周模糊度解算的实现尤为困难。因此，为了解决这一局限性，进一步提高多GNSS定轨的精度，我们尝试将系统内的双差模糊度修正为整数，并提出了一种用于多GNSS POD的整数AR方法。为了验证AR的贡献，对141个覆盖全球的站点进行了实验。结果表明，该方法全年对GPS、GLONASS、BDS和GALILEO的平均定位率分别为98.1%、96.4%、84.6%和92.6%。在与国际全球导航卫星系统(IGS)最终轨道相比的精度、重叠日边界处的不连续性以及卫星激光测距残差方面，使用AR进一步改进了GNSS轨道。因此，整数AR提高了多颗GNSS精密定轨的精度，可以加强多颗GNSS的综合数据处理及其在未来的应用。
The China Satellite Navigation Office announced on December 27, 2018 that the BDS-3 preliminary system had been completed to provide global services. Before this, GPS and GLONASS were the only two global navigation satellite systems (GNSS) supporting global positioning service, and have totally more than 50 satellites in normal operation. Furthermore, Galileo is intending to reach its full constellation around 2020. By that time, the number of available GNSS satellites will increase to more than 100, which brings both opportunities and challenges for high-precision positioning and orbit determination. The precision of orbits could be significantly improved through integer ambiguity resolution (AR), while AR is particularly difficult to achieve especially for GLONASS and BDS due to inter-frequency biases and satellite-induced code biases. Therefore, to address this limitation and further enhance the precision of multi-GNSS orbit determination, we try to fix the double-differenced intra-system ambiguities to integers and propose an integer AR method for multi-GNSS POD. To verify the contribution of AR, an experiment of 141 sites with global coverage is conducted. The results imply that the approach realizes an average fixing rate of 98.1%, 96.4%, 84.6% and 92.6% for GPS, GLONASS, BDS and Galileo over a whole year. The GNSS orbits are further improved with AR in terms of the precision compared with the International GNSS Service (IGS) final orbits, the discontinuity at overlapping day boundaries, and satellite laser ranging residuals. Thus, the integer AR improves the precision of multi-GNSS precise orbit determination, which can enhance integrated data processing of multi-GNSS and their applications in the future.
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影响因子：
4.4
作者：
Ge, M;Gendt, G;Zhang, FP
通讯作者：
Zhang, FP
影响因子：
4.9
作者：
P. Steigenberger;O. Montenbruck
通讯作者：
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影响因子：
2.3
作者：
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通讯作者：
Francis, Olivier
DOI：
--
发表时间：
2013
期刊：
--
影响因子：
--
作者：
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通讯作者：
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影响因子：
4.9
作者：
Cai, Changsheng;Gao, Yang
通讯作者：
Gao, Yang