On Thu, 19 Feb 2004 03:10:41 GMT, Peter wrote:

Unaugmented GPS has insufficient integrity monitoring.
http://www.cts.cv.ic.ac.uk/html/Rese...p?seminarID=62
:
"The assessment results also indicated that the current GPS system cannot
meet the RNP in most of the cases and the current integrity monitoring
mechanism is inadequate for providing the necessary integrity monitoring
capability. Therefore, this study suggests that augmentation systems are
needed to support the navigation function for all phases of flight." Jan.
28, 2004, Imperial College, London, Dr. Shaojun.


I looked at the link you posted. It seems to be a summary of what is
intended to be presented at a seminar, with no associated evidence. It is
also not clear as to what Shaojun's definition of "inadequate" is.

It is not clear to me what method of integrity monitoring is going on in
the British airspace to which Shaojun refers, but it seems to be
unaugmented RAIM.

The summary indicates that his study "route" was London to New York. But
my understanding is that trans-oceanic flights have to have multiple
navigation systems, only one of which can be GPS.




Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)