多模GNSS精密卫星钟差估计与分析

对基于历元间差分相位和非差伪距观测值的混合差分卫星钟差估计方法进行了改进，实现了多模全球导航卫星系统（Global Navigation Satellite System，GNSS）卫星钟差联合快速估计。选择了全球分布的50个跟踪站进行实验，对卫星钟差精度进行了分析和精密单点定位（Precise Point Positioning，PPP）验证。结果表明:多模卫星钟差与武汉大学提供的最终精密卫星钟差互差优于0.2 ns，精密单点定位结果与武汉大学发布的最终精密卫星轨道和钟差产品的定位精度相当。

Multi-GNSS Satellites Clock Estimation and Analysis

By improving the satellites clock offset estimation method with epoch-differenced phase and un-differenced pseudo-range observations, we realize the estimation of GPS, GLONASS, BDS, and Galileo satellite clock offsets. Moreover 50 GNSS stations distributed worldwide were used to acquire multi-GNSS satellites clock offsets. Their precisions were analyzed. PPP was used to validate the estimated satellite clock offsets. The experimental results illustrate that the biases between satellite clock offsets as estimated and the final multi-GNSS precise satellites clock offsets generated using PANDA software package of Wuhan University were less than 0.2 ns. The PPP results using the estimated satellite clock offsets were close to the results estimated using the final multi-GNSS satellite clock offsets generated with the Wuhan University PANDA software.