The Stanford - ESA Integrity Diagram: Focusing on SBAS Integrity
The Stanford - ESA Integrity Diagram: Focusing on SBAS Integrity
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发表时间：
2006-09
影响因子：
2.6
通讯作者：
M. Tossaint;J. Samson;F. Toran;J. Ventura-Traveset;J. Sanz;M. Hernández‐Pajares;J. Juan
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文献类型：
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作者：
M. Tossaint;J. Samson;F. Toran;J. Ventura-Traveset;J. Sanz;M. Hernández‐Pajares;J. Juan
在这篇文章中，SBAS完整性验证的新概念。所提出的概念是众所周知的斯坦福大学图[2]的修改，其中2D直方图示出了使用全视野卫星选择的一组测量的位置误差与保护水平的关系。新方法由两个图组成：最差安全指数图和“全几何”图，在这里分别称为斯坦福-ESA和全斯坦福-ESA。第一个包括在每个采样时间和给定位置，从SBAS完整性裕度的角度来看，最坏的可能的卫星几何组合（所有可能的组合）。在第二种情况下，显示所有可能的几何形状，并且在MI的情况下，与每个时期相关联的几何形状用不同的符号和颜色进行调整。它允许，很容易地识别不同的集群，并评估事件的时间相关性。这里给出的真实的测量结果表明，在这个非常紧急的标准下，EGNOS完整性裕度仍然是安全的，这是一个肯定非常积极的结果。这里建议使用斯坦福-欧空局完整性概念进行常规性能监控，并使用真实的实验数据支持和补充EGNOS系统的安全案例。
In this article, a new concept for SBAS integrity validation is presented. The proposed concept is a modification of the well known Stanford diagram [2], where a 2D histogram shows the relationship of position errors against protection levels for a set of measurements using an all in view satellite selection. The new method consists on two diagrams: the Worse-Safety Index diagram and the “All-Geometries” diagram, known here as the Stanford-ESA and the All-Stanford-ESA, respectively. The first consist on taking, at each sample time and given location, the worst possible satellite geometrical combination (out of all possible combinations) from a SBAS integrity margin viewpoint. In the second, all possible geometries are displayed and, in case of MIs, the geometries associated to each epoch are leveled with different symbols and colors. It allows, to easily identify the different clusters and to assess the time correlation of the events. Real measurement results are presented here showing that the EGNOS integrity margins remain safe under this very exigent criterion, a certainly very positive result. It is suggested here to use the Stanford-ESA Integrity concept, for routine performance monitoring and to support and complement the safety case of the EGNOS system with real experimental data.