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Multi-GNSS real-time precise clock estimation considering the correction of inter-satellite code biases
GPS Solutions ( IF 4.9 ) Pub Date : 2021-01-15 , DOI: 10.1007/s10291-020-01065-z
Liang Chen , Min Li , Ying Zhao , Zhigang Hu , Fu Zheng , Chuang Shi

For reasons mostly related to chip shape distortions, global navigation satellite system (GNSS) observations are corrupted by receiver-dependent biases. These are often stable in the long term, though numerically different depending on the signal frequency, satellite system and receiver manufacturer. Based on the mixed-differenced model combining undifferenced pseudorange with epoch-differenced carrier phase observations, we present a multi-GNSS real-time precise clock estimation model considering correction of inter-satellite code biases (ISCBs). Pre-estimated receiver-dependent ISCB corrections are introduced to correct the inter-receiver, inter-satellite and inter-system biases largely. Then the number of estimated parameters is reduced to a manageable level for real-time estimation. Comparisons with post-processed data show that compared to undifferenced, epoch-differenced and non-bias-corrected mixed-differenced models, the proposed bias-corrected model can greatly reduce the precise clock offset systematic biases, especially for GLONASS and BeiDou. The test results show the root mean square data reductions are improved by up to 96% for GLONASS, 78% for BeiDou and 40% for GPS and Galileo.



中文翻译:

考虑到星际码偏差校正的多GNSS实时精确时钟估计

由于主要与芯片形状失真有关的原因,全球导航卫星系统(GNSS)的观测值因接收机相关的偏差而受到破坏。尽管在数值上取决于信号频率,卫星系统和接收器制造商,但它们通常长期稳定。基于将无差异伪距与历时差分载波相位观测值相结合的混合差分模型,我们提出了一种考虑到星际代码偏差(ISCB)校正的多GNSS实时精确时钟估计模型。引入了预先估计的依赖于接收机的ISCB校正,以在很大程度上校正接收机间,卫星间和系统间的偏差。然后,将估计参数的数量减少到可管理的水平,以进行实时估计。与后处理数据的比较表明,与无差异,历时差异和无偏差校正的混合差异模型相比,所提出的偏差校正模型可以大大减少精确的时钟偏移系统偏差,尤其是对于GLONASS和BeiDou。测试结果表明,GLONASS,北斗78%,GPS和Galileo的均方根数据减少量提高了96%。

更新日期:2021-01-15
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