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Re: R: Problems with AstronavPC
From: Federico Rossi
Date: 2004 Feb 17, 14:15 +0100
Messaggio
From: Federico Rossi
Date: 2004 Feb 17, 14:15 +0100
Dear
George,
thank you very much
for writing down the equations about fix error from
AstronavcPC.
I've read your email
and it proved useful in clarifyng some aspects of the problem, still one thing
is still obscure to me: the formula to calculate the variance S
reads:
S = F - DdB - EdL
cos B(F)
I guess that D and E
are the same that appear in the formulas to calculate lat and long of fix while
B(F) is the latitude of fix.
What about dB and
dL? Are they the difference respectively in latitude and longitude between the
fix and the initially assumed position? If so, what is F?
Thanks in
advance.
Federico