[time-nuts] lightsquared test in las vegas
brooke at pacific.net
Thu Jun 9 17:28:05 UTC 2011
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.
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.
>> 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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