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Towards Computing Exact Horizontal Protection Limits for Satellite Based Navigation Systems
 

Summary: Towards Computing Exact Horizontal Protection
Limits for Satellite Based Navigation Systems
John E. Angus
Claremont Graduate University and Raytheon Systems Company
Abstract
The horizontal protection limit (HPL) with exact level 1- is defined
to be the value that bounds, from above, the radial horizontal error in
satellite based positioning with probability equal to 1-. RTCA D0229A,
dated June 8, 1998, defines a conservative horizontal protection limit for
en route through non precision approach modes of navigation for a mini-
mally capable augmented Global Positioning System (GPS) receiver as a
number that over-bounds radial horizontal error with probability at least
1-(5 10-9
) . This note examines various representations of the distri-
bution of squared radial horizontal error and the computation of HPL at
exact levels under the usual assumptions on satellite pseudo range errors.
Comparison of HPL at the exact level 1-

5 10-9

  

Source: Angus, John - School of Mathematical Sciences, Claremont Graduate University

 

Collections: Mathematics