Denys Fedoryshchenko <nuclearcat@nuclearcat.com> wrote:
On 2019-06-21 14:19, Niels Bakker wrote:
Have you tried this? Because I have, and it's absolutely terrible. GPS doesn't give you the correct time, it's supposed to give you a good 1pps clock discipline against which you can measure your device's internal clock and adjust accordingly for drift due to it not being Cesium-based, influenced by room temperature etc.
You're unlikely to get the 1pps signal across USB, and even then there'll likely be significant latencies in the USB stack compared to the serial interface that these setups traditionally use.
I think it depends on recipe you are using. Raspberry have low latency GPIO, and some receivers have 1pps output. https://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html
And there are tricks for avoiding temperature-related deviations :-) https://blog.ntpsec.org/2017/02/01/heat-it-up.html Tony. -- f.anthony.n.finch <dot@dotat.at> http://dotat.at/ defend the right to speak, write, worship, associate, and vote freely