Ephemeris Protection Level Equations and Monitor Algorithms for GBAS

The authors would like to thank Todd Walter and Gang Xie for their help during this research. This work was also supported by the efforts of Barbara Clark of FAA AIR-130, Tom Hsiao, Curt Shively, Chris Varner, and Ron Braff of MITRE, Victor Wullschleger and John Warburton of FAA ACT-360, and others participating in RTCA SC-159 WG-4 requirements development. The advice and interest of many other people in the Stanford GPS research group is appreciated, as is funding support from the FAA LAAS Program Office (AND-710). The opinions discussed here are those of the authors and do not necessarily represent those of the FAA or other affiliated agencies.