We report the GPS satellite clock estimation using 20 globally distributed receivers with an external hydrogen maser atomic clock. By applying corrections for the Sagnac effect, the relativistic effect due to orbit eccentricity, tropospheric and ionospheric delays, satellite and receiver antenna phase center offsets and variations, solid earth tides, ocean tide loading, phase wind-up effect, and P1-C1 bias, our satellite clock results matches the IGS final clock product within ± 1.4 ns with comparable frequency stability for an averaging time of less than 1000 sec and a 10–30% worse frequency stability for an averaging time of greater than 1000 sec, on MJD 58244. This small atomic clock network results in a fast computation that becomes increasingly appealing when the real-time satellite orbit and clock estimation is needed and as the GNSS constellations and the GNSS signals expand.

我们使用 20 个全球分布式接收器和外部氢脉泽原子钟报告 GPS 卫星时钟估计。通过对 Sagnac 效应、由于轨道偏心、对流层和电离层延迟、卫星和接收器天线相位中心偏移和变化、固体地球潮汐、海洋潮汐载荷、相位缠绕效应和 P1-C1 偏差造成的相对论效应进行修正，我们的卫星时钟结果在 ± 1.4 ns 内与 IGS 最终时钟产品匹配，平均时间小于 1000 秒，频率稳定性相当，平均时间大于 1000 秒，频率稳定性差 10-30%，在 MJD 58244 上.