High-rate GPS clock corrections from CODE: support of 1 Hz applications
High-rate GPS clock corrections from CODE: support of 1 Hz applications
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DOI：
10.1007/s00190-009-0326-1
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发表时间：
2009-11-01
影响因子：
4.4
通讯作者：
Beutler, G.
中科院分区：
文献类型：
--
作者：
Bock, H.;Dach, R.;Beutler, G.
采样率高达1 Hz的GPS零差应用需要相应的高速率GPS时钟校正。在完整的网络解决方案中确定时钟校正是一项耗时的任务。欧洲轨道确定中心（CODE）开发了一种基于历元差分相位观测的有效算法，该算法可以在合理的短时间内（< 2小时）生成高速率时钟校正，并具有足够的精度（分别与CODE的快速或最终时钟校正相同）。详细介绍了CODE的时钟确定过程和新算法。它示出的简化，以加快处理不会导致时钟校正的准确性的显着损失。高速率时钟校正在本质上具有与在全网络解决方案中确定的时钟校正相同的质量。为了支持1 Hz应用，需要1-s时钟校正。然而，即使对于有效算法，计算时间也是不可忽略的。因此，我们研究了减少采样是否足以使GPS卫星时钟校正达到与完整的1-s时钟校正集相同或略差的精度水平。我们表明，间隔5秒的高速卫星时钟校正可以线性插值，导致准确度下降不到2%。
GPS zero-difference applications with a sampling rate up to 1 Hz require corresponding high-rate GPS clock corrections. The determination of the clock corrections in a full network solution is a time-consuming task. The Center for Orbit Determination in Europe (CODE) has developed an efficient algorithm based on epoch-differenced phase observations, which allows to generate high-rate clock corrections within reasonably short time (< 2 h) and with sufficient accuracy (on the same level as the CODE rapid or final clock corrections, respectively). The clock determination procedure at CODE and the new algorithm is described in detail. It is shown that the simplifications to speed up the processing are not causing a significant loss of accuracy for the clock corrections. The high-rate clock corrections have in essence the same quality as clock corrections determined in a full network solution. In order to support 1 Hz applications 1-s clock corrections would be needed. The computation time, even for the efficient algorithm, is not negligible, however. Therefore, we studied whether a reduced sampling is sufficient for the GPS satellite clock corrections to reach the same or only slightly inferior level of accuracy as for the full 1-s clock correction set. We show that high-rate satellite clock corrections with a spacing of 5 s may be linearly interpolated resulting in less than 2% degradation of accuracy.