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High-rate GPS clock corrections from CODE: support of 1Hz applications

Bock, H. ; Dach, R. ; Jäggi, A. ; Beutler, G.

In: Journal of Geodesy, 2009, vol. 83, no. 11, p. 1083-1094

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    Title
    • High-rate GPS clock corrections from CODE: support of 1Hz applications
    Author
    • Bock, H.. Astronomical Institute, University of Bern, Sidlerstr. 5, 3012, Bern, Switzerland
    • Dach, R.. Astronomical Institute, University of Bern, Sidlerstr. 5, 3012, Bern, Switzerland
    • Jäggi, A.. Astronomical Institute, University of Bern, Sidlerstr. 5, 3012, Bern, Switzerland
    • Beutler, G.. Astronomical Institute, University of Bern, Sidlerstr. 5, 3012, Bern, Switzerland
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:312376
    Summary
    GPS zero-difference applications with a sampling rate up to 1Hz 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 (<2h) 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 1Hz 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 5s may be linearly interpolated resulting in less than 2% degradation of accuracy