中文摘要：

研究了观测数据短时失锁或中断情况下的精密单点定位-模糊度解算（precise point positioning-ambiguity resolution,PPP-AR）模糊度快速重收敛方法,给出了合理的观测值精化信息外推时间阈值,从系统端和用户端分别论证了该方法对提升现有非差网络RTK（undifferenced network real time kinematic positioning,URTK）服务可靠性的重要意义,并设计了相应的实时测试方案进行验证分析。测试结果表明,观测值精化信息可有效外推至少30s,采用PPP-AR模糊度快速重收敛技术后,即使在周跳频繁发生的恶劣观测条件下也能使URTK系统端和用户端保持较高的服务可靠性。用户无需区域增强系统支持即可独立实现模糊度快速重收敛,有效降低了用户从URTK系统端获取区域增强信息时的实时数据通讯负担。

英文摘要：

We study PPP-AR rapid ambiguity re-convergence in the case of short-term loss or disruption of observation data,offer a reasonable extrapolation time threshold for using augmentation information,demonstrate the reliability improvement of existing URTK services when using this method,and design a corresponding real-time testing scheme to verify its availability.The results show that,augmentation information can be extrapolated for at least 30 s,and that the PPP-AR rapid ambiguity re-convergence method can improve the reliability of URTK service for control center and rovers even in poor observation conditions.Rovers can independently realize ambiguity rapid re-convergence without the support of regional URTK augmentation service,which will reduce the real-time data communication burden between rovers and control center significantly.