[time-nuts] lightsquared test in las vegas
lists at rtty.us
Thu Jun 9 16:17:04 EDT 2011
Ummm, errr ... not so much.
KAL007 went down September 7th 1983. NIST was publishing papers on two way
time transfer in 1980:
Much of the early GPS timing and design work was made quite public in
various FCS papers in the 1970's.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brooke Clarke
Sent: Thursday, June 09, 2011 1:28 PM
To: jfor at quik.com; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] lightsquared test in las vegas
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
>> 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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