URA/SISA Analysis for GPS-Galileo ARAIM Integrity Support Message
URA/SISA Analysis for GPS-Galileo ARAIM Integrity Support Message
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发表时间：
2015-10
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通讯作者：
S. P. Diaz;M. Meurer;M. Rippl;B. Belabbas;M. Joerger;B. Pervan
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作者：
S. P. Diaz;M. Meurer;M. Rippl;B. Belabbas;M. Joerger;B. Pervan
本文提出了一个URA/SISA分析，以支持ARAIM的基础上，随时间变化的统计特性的轨道和时钟误差观测。对于每个单独的GPS和伽利略卫星，通过比较精确的轨道广播星历数据，这项工作计算的信号在空间距离误差（SISRE），需要由包含在ISM中的URA/SISA值的超限。通过对GPS七年多和Galielo四个月的服务历史数据的分析，表明距离误差主要受卫星时钟性能的影响。在历史上表现良好的$\sigma_{SISRE}$卫星都配备了稳定的时钟，显示小的误差分散。一个具体的例子是GPS SVN 65/PRN 24，其铯时钟与配备铷时钟的GPS模块IIF的其余部分相比，其卫星的性能更好。随时间变化的结果表明，轨道和时钟误差分布不是零平均每月的基础上，虽然他们没有表现出显着的偏差，在长期的规模。这一事实可能会打开ISM中包含的短期自适应$B_{nom}$和$\sigma_{URA}$超限参数的可能性。
This paper presents a URA/SISA analysis to support ARAIM based on a time-dependent statistical characterization of orbit and clock errors observations. For each individual GPS and Galileo satellites, by comparing precise orbits to broadcast ephemeris data, this work computes the Signal in Space Range Error (SISRE) which needs to be overbounded by the URA/SISA value included in the ISM. Over seven years of service history data for GPS and four months for Galielo are computed in this analysis, showing that range error is manly driven by satellite's clock performance. Satellites that historically have presented well behaved $\sigma_{SISRE}$ are equipped with stable clocks which display small error dispersion. A particular example is provided through GPS SVN65/PRN24 whose Cesium clock worsens satellite's performance as compared to the rest of the GPS block IIF equipped with Rubidium clocks. Time-dependent results show that orbit and clock error distributions are not zero mean on a monthly basis, although they do not exhibit a significant bias in a long-term scale. This fact might open the possibility of a short-time adaptable $b_{nom}$ and $\sigma_{URA}$ overbounding parameters contained in the ISM.