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Improving real-time clock estimation with undifferenced ambiguity fixing

机译：使用无限的歧义固定提高实时时钟估计

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Real-time clock products are essential and a prerequisite for global navigation satellite system (GNSS) real-time applications, which are usually estimated from real-time observations from reference stations of a ground network without fixing the phase ambiguities. To improve the precision of real-time clock products further, an undifferenced ambiguity fixing algorithm is proposed for the classical real-time clock estimation method without requiring modifications to the current data processing strategy and product consistency. Combined with the wide-lane (WL) ambiguities, the ionospheric-free (IF) ambiguity estimates generated by the traditional clock estimation method are fed to an independent ambiguity fixing process to estimate the WL and narrow-lane (NL) uncalibrated phase delays (UPDs) and fix the WL/NL undifferenced ambiguities at each epoch. The fixed IF ambiguities are recovered from these WL/NL UPDs and integer ambiguities and then used to constrain the float-ambiguity clock solution. The proposed strategy is tested on 30 days of observations of 85 globally distributed reference stations of the international GNSS service (IGS) and multi-GNSS experiment (MGEX) networks. In the experiment, 99.96% of the post-fit residuals of WL ambiguities and 99.31% of the post-fit residuals of NL ambiguities fall in the range of (-0.3, 0.3), with standard deviations (STD) of 0.045 and 0.074 cycles, respectively, which demonstrates the high precision and consistency of UPDs and fixed ambiguities. With the constraint of fixed ambiguities, the traditional float-ambiguity clock solution is further refined, resulting in ambiguity-fixed clock solution. Comparison with the IGS 30s final clock products shows that ambiguity-fixing brings as much as 50-87% precision improvement to the float-ambiguity clock solution, and with an average improvement over 30days of 24-50% for each satellite. When used in the float-ambiguity kinematic PPP test, the ambiguity-fixed clock brings at least 5
机译：实时时钟产品对于全球导航卫星系统（GNSS）实时应用是必不可少的，并且通常从地面网络的参考站的实时观察估计，而不会修复相位歧义的实时观察。为了提高实时时钟产品的精度，提出了一种无限的模糊固定算法，用于经典实时时钟估计方法，而不需要修改当前数据处理策略和产品一致性。结合宽车道（WL）歧义，由传统时钟估计方法产生的无电离层（IF）模糊的估计被馈送到独立的模糊性固定过程，以估计WL和窄通道（NL）未校准相位延迟（ UPDS）并修复每个时代的WL / NL未经定义的歧义。如果从这些WL / NL UPDS和整数歧义中恢复歧义，则固定固定，然后用于限制浮动模糊的时钟解决方案。在国际GNSS服务（IGS）和多GNSS实验（MGEX）网络的85个全球分布的参考站的观察中，测试了拟议的策略。在实验中，99.96％的WL模糊物质剩余残留物和99.31％的NL模糊率的99.31％下降（-0.3,0.3），标准偏差（STD）为0.045和0.074周期分别展示了更新和固定歧义的高精度和一致性。随着固定歧义的约束，传统的浮动模糊时钟解决方案进一步精制，导致模糊的时钟解决方案。与IGS 30S的比较最终时钟产品表明，模糊 - 固定为浮动模糊的时钟解决方案带来了多达50-87％的精确改善，并且每个卫星的平均改善为30天24-50％。在浮动模糊运动的运动PPP测试中使用时，模糊 - 固定时钟会带来至少5个

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