5 ms·
Technically yes but the user of that system doesn't have to have an accurate clock, the GPS system itself provides the time signal. I think the first stage of G
by 15457345234 3y ago
Technically yes but the user of that system doesn't have to have an accurate clock, the GPS system itself provides the time signal. I think the first stage of GPS positioning is clock signal acquisition and training the local oscillator. Once synced you can proceed with almanac download or whatever comes next.
(The accurate (atomic) clocks are on the satellites and base stations.)
- nequo 3y agoSeiko also builds watches that use GPS signals to set the time zone and the time.[1] Seems like a cool idea if you cross time zones often and have an extra $2,000 on your hands. [1] https://www.seikowatches.com/us-en/products/astron/features_gps https://www.seikowatches.com/us-en/products/astron/features_...
- throw0101a 3y agoAs does Citizen: * https://www.citizenwatch.com/ca/en/technology-satellite-timekeeping.html https://www.citizenwatch.com/ca/en/technology-satellite-time...
- WalterBright 3y agoMy phone does that, too !!
- 15457345234 3y agoI think most phones with a GPS receiver don't use it for time, they use the native network time signal instead. This is annoying as the (formerly) GSM time signal in many cases used to be _way_ off, like, 5-10 seconds off. This situation has improved somewhat in the last 10 years or so.
- killingtime74 3y agoUm, most gps sports watches do. There are even ones that are multi-band gps (L1/L5)
- AlotOfReading 3y agoGPS receivers are required to have excellent stability (<<1ppm), but not accuracy. The problem of marine chronometry was also about stability and not accuracy. After all, if you have a stable but inaccurate clock and can't tune it for some reason, it's straightforward to compensate for the offset when measuring to calculate your position.