On 2011-08-29, Harlan Stenn <st...@ntp.org> wrote: > GPS can be done very affordably and can offer great time. There are > several *potential* pitfalls: > > - It is *possible* for the US Gov't to detune the GPS system (locally or > in-general). Since GPS is now increasingly used for "human safety" > things, the costs/risks for doing this have gone up significantly so > this risk may now be more of a threat than a reality
At worst this would degrade the time of a gps to a few 100ns, rather than 10s of ns. > > - bugs happen, and relying on one of anything can cause a problem. If > you have enough souces of time, ntpd will throw away information from > a source (including GPS) that it does not believe. Or GPS jamming either deliberate (in times of war by an enemy, or a friend, in times of peace by stupid commercial people accidentally deplying a system whose consequence is to jam the GPS) . > > There are other potential failure modes as well, but most everything has > these issues. > > H _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
