Hi Ummm, errr ... not so much.
KAL007 went down September 7th 1983. NIST was publishing papers on two way time transfer in 1980: http://tf.nist.gov/general/pdf/192.pdf Much of the early GPS timing and design work was made quite public in various FCS papers in the 1970's. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brooke Clarke Sent: Thursday, June 09, 2011 1:28 PM To: [email protected]; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] lightsquared test in las vegas 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 -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
