[time-nuts] lightsquared test in las vegas
Brooke Clarke
brooke at pacific.net
Thu Jun 9 17:28:05 UTC 2011
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
>>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>
>
More information about the Time-nuts_lists.febo.com
mailing list