The quality of real-time satellite clock offsets products is one of the key elements for real-time satellite clock performance monitoring and real-time precise point positioning (PPP). However, impacted by the station location, environment, communication equipment, receiver performance, network delay, temporary modem failure or other reasons, the observation data of clock offset datum receiver occasionally outage, resulting in all satellite clocks offset cannot be estimated. In this contribution, an efficient clock offset datum switching compensation method for BDS real-time satellite clock offset estimation is proposed. One hundred stations distributed around the world, from day of year (DOY) 074 to 075 in 2019 are used to estimate BDS real-time satellite clock offset. Four schemes: clock offset datum switching without compensation (S1), clock offset datum switching with satellite clock offset jump compensation (S2), clock offset datum switching with satellite clock offset jump and receiver clock drift compensation (S3, the proposed method), clock offset datum without switching (S4), are used to validate the proposed method. By using the proposed method, the satellite clock offset jump can be eliminated and the satellite clock offset consistency can be maintained. The satellite clock offsets STD for S1, S2, S3 and S4 are 0.184, 0.183, 0.183 and 0.150 ns, respectively. The fitting precision of S1, S2, S3 and S4 are 70907.344, 0.731, 0.502 and 0.543 ns, respectively. The frequency stability of S3 shows the best performance among S2, S3 and S4 when the averaging interval time is 10,000 and 20,000 s, which can be attributed to the effectiveness of proposed method and frequency stability difference of clock offset datum receiver. The fitting precision and frequency stability cannot be reflected correctly by clock offset due to the satellite clock offset jump in S1. For precise point positioning (PPP), the coordinates jump and re-convergence can be eliminated by using the proposed method. Thus, this method can provide a reference for obtaining real-time, continuous and reliable BDS satellite clock offset products.

实时卫星时钟偏置产品的质量是实时卫星时钟性能监测和实时精确点定位（PPP）的关键要素之一。但是，受台站位置、环境、通信设备、接收机性能、网络延迟、调制解调器临时故障或其他原因的影响，时钟偏移基准接收器的观测数据偶尔会中断，导致无法估计所有卫星时钟偏移。在此贡献中，提出了一种用于 BDS 实时卫星时钟偏移估计的有效时钟偏移基准切换补偿方法。分布在世界各地的 100 个站，从 2019 年的第 074 天到 075 日，用于估计 BDS 实时卫星时钟偏移。四种方案：无补偿时钟偏移数据切换（S1），时钟偏移数据切换与卫星时钟偏移跳跃补偿（S2），时钟偏移数据切换与卫星时钟偏移跳跃和接收器时钟漂移补偿（S3，建议的方法），时钟偏移数据不切换（S4），用于验证提出的方法。采用该方法可以消除卫星钟差跳跃，保持卫星钟差一致性。S1、S2、S3 和 S4 的卫星时钟偏移 STD 分别为 0.184、0.183、0.183 和 0.150 ns。S1、S2、S3和S4的拟合精度分别为70907.344、0.731、0.502和0.543 ns。当平均间隔时间为10,000和20,000 s时，S3的频率稳定性在S2、S3和S4中表现最佳，这可以归因于所提出方法的有效性和时钟偏移数据接收器的频率稳定性差异。由于S1中的卫星时钟偏移跳跃，时钟偏移不能正确反映拟合精度和频率稳定性。对于精确点定位（PPP），使用所提出的方法可以消除坐标跳跃和重新收敛。因此，该方法可为获取实时、连续、可靠的北斗卫星钟差产品提供参考。