GPS/GLONASS/GALILEO实时服务（RTS）产品性能评估分析

目前,不同机构提供的GNSS实时服务产品性能存在差异。为了全面揭示实时服务产品的性能，为系统服务和用户应用提供参考，统计了各实时服务产品的历元完整率及卫星数量，基于实时轨道和钟差恢复方法，比较分析了产品精度，并评估了产品定位性能。研究结果表明：正常情况下，实时服务产品的历元完整率较高，基本可保持在95%以上，所提供系统的卫星数量保持稳定且充足。对于GPS，各机构卫星实时轨道平均精度基本一致，约为3cm，实时钟差精度略有差别。对于其他GNSS，不同机构产品精度存在差别。利用实时服务产品进行GPS实时精密单点定位的平面精度优于10cm，高程精度优于20cm。相对于GPS单系统，多系统联合定位精度基本一致，但收敛速度明显提升。

Performance Evaluation and Analysis of GPS/GLONASS/GALILEO Real-Time Service (RTS) Products

At present, there are differences in the performance of GNSS Real-Time Service (RTS) products provided by different institutions. It is of practical significance to comprehensively evaluate the performance of GNSS RTS products, which can provide references for the services and applications of GNSS. The epoch integrity rate and the number of satellites of each RTS product are counted. The accuracy of all RTS products is compared and analyzed based on recovery methods of the real-time orbit and clock-difference products. Real-Time Precise Point Positioning (RT-PPP) performances of RTS products are evaluated through experiments. The results of research show that the epoch integrity rate of RTS products is relatively high under normal circumstances, which can basically be maintained above 95%, and the number of satellites remains stable and sufficient. For GPS, the average accuracy of real-time satellite orbits of all RTS products is basically the same, about 3 cm, and the real-time clock-difference accuracy is slightly different. For other GNSS, there are differences in the accuracy of different RTS products. Using RTS products, the accuracy of GPS RT-PPP is better than 10cm in the east and north components, and 20cm in the vertical components. Compared with RT-PPP using single-GPS, the accuracy of multi-system joint positioning is basically the same, but the convergence speed is significantly improved.