Investigation and Comparison of Horizontal Protection Level and Horizontal Uncertainty Level in FDE Algorithms.
SC-FDE公司
计算机科学
算法
作者
Ryan S.Y. Young,Gary A. McGraw,Brian T. Driscoll
出处
期刊:Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996)日期:1996-09-20卷期号:: 1607-1614被引量:12
The fault detection and exclusion (FDE) function in a
GPS receiver ensures the integrity of the navigation
solution and prevents the display and use of hazardous
and misleading information (HMI). The FDE function is
required to provide a figure of merit of its current
protection capability which is known as the horizontal
protection level (HPL). For primary-means GPS
navigation, the FDE function is also required to provide
an estimate of current horizontal position uncertainty,
based on measurement inconsistency, which is the
horizontal uncertainty level (HUL). There are subtle, but
important, differences between HPL and HUL that have
not been fully explained in the current literature. This
paper compares design philosophies of HPL and HUL
and examines differences between them for stand-alone
GPS navigation. HPL and HSJL algorithms for snapsot
parity space FDE approaches are proposed which meet
requirements for all phases of non-precision flight. The
performance of various HPL algorithms discussed in the
literature are evaluated through detailed Monte Carlo
simulation studies.