广域实时精密定位系统可以提供大范围、实时、高精度定位服务，具有广泛的应用前景，是当前GNSS领域的研究热点。卫星钟差和初始相位偏差（UPD）产品由于其时变不规律性，需要实时估计以满足用户精度需求，是系统算法的核心。目前，基于整网固定解方式同时提取两类产品无法满足实时更新频率需求，而分步提取时产品精度相对偏低，需要开展进一步的研究工作。.本项目旨在提出一种改进的产品分步提取策略，首先设计引入多种约束信息的实时高频卫星钟差估计优化算法，然后固定卫星钟差，按照单站-网络的思路，设计基于双差模糊度固定解的UPD快速提取方法。重点研究内容包括如何加速卫星钟差初始时刻偏差收敛，如何引入PPP模糊度固定的天顶对流层湿延迟结果提高钟差变化估计精度，以及如何快速获取双差模糊度固定解并用于UPD产品快速提取。本项研究可以为系统建设提供技术支持，进一步提高系统服务性能，具有重要的理论意义和应用价值。

Wide-area real time precise positioning system can provide real time precise positioning service to users in great regions, thus has broad application prospects and becomes the hotspot in the GNSS research field. Due to the irregularity of satellite clock error and un-calibrated phase delay (UPD), these products should be estimated in real time to satisfy the accuracy requirements, which is the key problem in system design. Currently, the updating frequency requirement cannot be satisfied when generating two products together based on the fixed network solution, while the accuracy is comparably lower when generating them sequentially. Consequently, further research should be done..An improved multi-layer processing strategy will be proposed in the project. Firstly, an improved real time high-rate satellite clock error estimation algorithm is designed by importing several constraints. Then, the clock error is fixed, and a real time UPD estimation method based on the fixed double difference ambiguity information is designed. The main focus include how to accelerate the convergence of satellite clock error initial bias, how to import the zenith wet delay results from PPP ambiguity resolution to improve the accuracy of clock error variation estimation, together with how to obtain fixed double difference ambiguity results efficiently and import them to the UPD estimation process. Our method is of important theoretical significance and application value, since it can provide technical support to the construction of the system, and further improve the performance of the system.