6 ms·
How does it solve for time without location? With GPS location and time are one solution to an equation with 4 unknowns (x,y,z,t). Without location you won't kn
by The_Double 1y ago
How does it solve for time without location? With GPS location and time are one solution to an equation with 4 unknowns (x,y,z,t). Without location you won't know the time delay between you and the transmitter.
- fnordpiglet 1y agoThe the transmitters are of fixed terrestrial locations.
- namibj 1y agoThe satellites are on known positions too, once you know the time.
- michaelt 1y agoSo you set your clock up by telling it its own location, so it can offset for the signal's flight time?
- rocqua 1y agoNo, you tell it the location of multiple towers it receives signals from, then it can compute the unique solution x, y, z, t
- brookst 1y agoBut the comment several levels up said they were demoing time with a single tower.
- mcculley 1y agoYou can get time with a single tower, but not location.
- brookst 1y agoHow do you know time of flight for the signal? Tower sends its coordinates, client uses GPS?
- rocqua 1y agoPerhaps they were just hand-fed to demonstrate accuracy. If instead of PPS it gave a 10Mhz reference, then there is a pretty good use in keeping nearby systems sample-synchronized. In which case you don't care about 'time' just about frequency accuracy.