6 ms·
Out of curiosity, can anyone say the most impactful things they've needed incredibly accurate time for?
by Topgamer7 9mo ago
Out of curiosity, can anyone say the most impactful things they've needed incredibly accurate time for?
- Sanzig 9mo agoSpacecraft state vectors.
- rcleveng 9mo agoSpanner (See https://docs.cloud.google.com/spanner/docs/true-time-external-consistency https://docs.cloud.google.com/spanner/docs/true-time-externa...)
- 0x457 9mo agoDoes it need to be this close to NIST, or just relative to each other? Because the latter one is solved by PTP.
- rcleveng 9mo agoAs far as I remember, near each other, but the comment I was replying to was specifically about needing accuracy. It's been over a decade now since I managed the truetime team at google, things may have changed since :)
- dyauspitr 9mo agoGPS
- srean 9mo agoNot sure but synthetic massive aperture radio telescope would need syncing their local clocks. I defer to the experts.
- jasonwatkinspdx 9mo agoAs far as I'm aware they just timestamp the sample streams based on a local gps backed atomic reference. Then when they get the data/tapes in one computing center they can just run a more sophisticated correlation entirely in software to smooth things out.
- pezezin 9mo agoI work at a particle accelerator. We use White Rabbit (https://white-rabbit.web.cern.ch/ https://white-rabbit.web.cern.ch/) to synchronize some very sensitive devices, mostly the RF power systems and related data acquisition systems, down to nanosecond accuracy.
- abeyer 9mo agoTelling people at the bar that I have an atomic clock at home.
- ted_dunning 9mo agoAs a very coarse number, 5µs is 1500 meters of radio travel. If (and it isn't very conceivable) GPS satellites were to get 5µs out of whack, we would be back to Loran-C levels of accuracy for navigation.