Terje Mathisen wrote: > John Hasler wrote: >> ScottyG writes: >>> Has anyone had any experience doing this? Can anyone suggest how to >>> achieve this accuracy? >> >> Talk to the very long baseline radio astronomers. >> >>> We do have some budget but this but if I need to spend a whole lot on >>> this I need to get in front of my management with the reasons. >> >> You will need to. Has someone already gotten in front of them with the >> reasons for this accuracy? >> >> Of course, recording timestamps with 100 nanosecond _precision_ is easy. > > That is probably the real requirement: > > Windows' os clock runs with 100 ns ticks, but the actual resolution and > accuracy is normally 10-17 ms. > > That said, yes you can get down to sub-us timestamps, but it requires > dedicated hardware to do so: > > First you must have a timing-optimized gps receiver, then you need some > hardware which can be slaved to the pps signal from that gps, and which > can also be used as the time base of all your logs. > > I.e.a PCI card or similar which your apllications can query directly to > get the current timestamp. >
ISTR that both Symmetricomm and Meinberg Funkurhren offer such cards at prices somewhere betwen $1250 and $2500; IOW they are not cheap!! I believe that both support an optional GPS receiver. For more money, of course! _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
