Re: SPS/Pulsars

--- "K.H.Ranitzsch" <KH.Ranitzsch@t-online.de> wrote:
> 
> ----- Original Message -----
> From: "Indy" <kochte@stsci.edu>

> Not really neccessary. If you have one fake, he has
> 50% chance of picking
> the wrong one. Make you beacon appear stronger than
> the pulsar, and the
> electronics may be dumb enough to go for the wrong
> one 90% of the time.

     Well if one coule gather the output from several 
stars to create and power the false signal, the likely
hood of the false data being used in the nav.
calculation is very small and ONLY has a chance of
success if the 'plot' is only using three points.
If five or more points are used the 'false' dats 
of the 'spoof' source would be detected as 'non-
standard' and would be rejected by even a civilian 
freighter.   Not to mention the creation of such a
device would cost more that most the major powers 
fleets.

Bye for now,
John L.

__________________________________________________
Do You Yahoo!?
Yahoo! Sports - Coverage of the 2002 Olympic Games