Hi Brooke, Could well be, but I know the system was severely constrained by satellite design considerations. 30+ years ago, high power was simply not available on orbit for long periods of time. The only real option is solar cells, then as now.
-John ============== > 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.
