Hi John:
It's my understanding the the GPS system was designed by the military so
that the received signal is below the thermal noise. That means that if
you look for it with a spectrum analyzer you will see noise. It wasn't
untill the KAL007 shoot down that the goverment disclosed it's existence
to prevent a similar thing from happening. The new GPS L5 "Safety of
Life" signal is to make aviation safer. So it appears that the focus
has changed from military to aviation.
http://en.wikipedia.org/wiki/Korean_Air_Lines_Flight_007#Aftermath
http://www.prc68.com/I/DAGR.shtml#GPSs
Have Fun,
Brooke Clarke
http://www.PRC68.com
J. Forster wrote:
Perhaps not in the abstract, but on-orbit power is severely limited, and
you can't get more RF watts out of a transmitter than you put in as DC.
Can you imagine the uproar if every GPS bird had a 10 KW transmitter on
board, powered bu a nuclear reactor?
The low received power is a direct consequence of engineering of satellites.
-John
================
On the other hand, what can be said about the wisdom of engineers that
designed a product that cannot withstand any interference from adjoining
spectrum holders? It has been known for at least the last 6 years that
LightSquared's predecessor was going to occupy that spectrum with a land
based system.
Does the GPS world really have much to say about the interference if
LightSquared keeps their transmitters clean and out of the GPS spectrum?
-Chuck Harris
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