Yang Xuhai (2011) presented a new method for determining the offset of navigation satellite onboard clock that processes ion-free code and phase combinations together with simultaneous TWSTFT measurements in the mode of transmitting and receiving with the same station (TWTRS for short) (signal flow: ground station-satellite-own ground station), which was called combination solution. The estimation error of the radial component of the orbit is not correlated with the clock estimation error. But there are still some details to analyze further. A successful determination of clock offset with respect to the master clock depends to a large extent on the correct determination of the inter-system bias. Two aspects of this paper are as follow: on the one hand, code measurement accuracy is limited as some minor errors are submerged in the overall trend and not easy to find. So the carrier phase smoothed code measurement can be used to improve the code measurement accuracy. On the other hand, clock offset onboard can be calculated independently from individual ground station by the combination solution. Taking difference for the same clock offset onboard during the same period can assess the combination solution. The RMS of residual value is less than 2 ns.
展开▼
机译：杨旭海（2011）介绍了一种确定导航卫星板载时钟的偏移的新方法，该时钟处理离子卫星和相位组合以及在发送和接收的同一站点（TWTRS for Short）的方式同时进行离子码和相位组合（信号流动：地面站 - 卫星户主地面站），被称为组合解决方案。轨道的径向分量的估计误差与时钟估计误差不相关。但还有一些细节进一步分析。关于主时钟的时钟偏移的成功确定在很大程度上取决于系统间偏置的正确确定。本文的两个方面如下：一方面，代码测量精度受到限制，因为一些小错误被淹没在整体趋势，并不易找到。因此，载波相平滑的代码测量可用于提高代码测量精度。另一方面，船上的时钟偏移可以通过组合解决方案独立地从各个地面站计算。在同一时期的同一时钟偏移的相同时钟偏移可能评估组合解决方案。残余值的rms小于2ns。
展开▼
