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Thank you! Francesco Ledda Garland, Texas -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on Behalf Of Magnus Danielson Sent: Sunday, November 15, 2009 9:01 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] The Demise of LORAN (was Re: Reference oscillator accuracy) b...@lysator.liu.se wrote: > John, > >> If a LORAN transmitter were destroyed by a terrorist team, a backup could >> be in operation in hours. A damaged GPS system could easily take many >> months or even years to fix. >> >> -John > > A LORAN site, with a several hundred meter high mast, a small house full > of transmitter, signal generation and Cs clock(s?)... on a remote > Norwegian island... would not be back online within a few hours after an > attack. Regardless of location, it will take some time to restore functionality. About a year maybe. The LORAN-C station would reduce navigation in a certain area. However, since most "interesting" targets use GPS, it is a more interesting target. > GPS is supposed to work without _any_ terrestrial support for days or > weeks. I doubt that anyone can get something lethal for the SVs up in > orbit without making it very obvious who they are. GPS now has lots of hot > spare birds in orbit, that a instantly online with one or a few satellites > going bust. The AutoNAV feature should keep it up for 180 days. It has never been used. Essentially, what if you wipe out the ground segment and needs to rebuild it. The ground segment points of GPS is fewer than the LORAN-C stations. Firing rockets to down the birds is above the average terrorist budget and infrastructure. While not all 30 GPS birds needs to go down, a significant number of them needs to for a significant system impact. Downing a single of them is sufficient for the political effect, so that is more likely. Using jammers is far more likely. It has been analyzed quite deeply. It is not impossible to locate a GPS jammer. In Iraq, they had relative high power jammers and they where able to locate them and finally take them out. > That said, I think LORAN should be kept running as a backup, also with a > firm commitment that it WILL KEEP running for 10+ years, giving vendors a > reason to develop modern receivers. The electronics needed to support LORAN-C and eLORAN is not very complex by todays measure. Could be integrated with a GPS receiver. Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. E-mail message checked by Spyware Doctor (6.0.0.386) Database version: 5.13700 http://www.pctools.com/en/spyware-doctor-antivirus/ E-mail message checked by Spyware Doctor (6.0.0.386) Database version: 5.13700 http://www.pctools.com/en/spyware-doctor-antivirus/ _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
