Quoting "G.W. Haywood" <[email protected]>:
http://www.satmagazine.com/cgi-bin/display_article.cgi?number=1419024350
Which is very fine for a fixed position, as the original question was.
With moving targets as the article describes, the solution is not only
pointless, but counterproductive.
From my understanding, you will seem to have come to an abrupt halt
at tunnel entrance, and dead reconing will fail completely.
Even worse, sophisticated GPS modules might get confused completely.
:)
Ack.
Retransmitting GPS signals is quite an idea, for short lengths of
copper cables it is even possible without amplification.
I have a setup here that with a passive antenna, ~20m low-loss-cable
(RG393), and a lamba/4 dipole (open ended antenna cable).
Placed very close to the receiver I get reasonable good reception at
my work desk; due to full sky view I have a better signal than from an
active antenna attached to the outer building wall.
It depends on the receiver sensibility, though.
Greetings
M.
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