3 ms·
(warning: armchair expert, I've just read a bunch of wikipedia pages) I believe there's still sources of systemic error that would affect all the signals simil
by ekimekim 10y ago
(warning: armchair expert, I've just read a bunch of wikipedia pages)
I believe there's still sources of systemic error that would affect all the signals similarly, such as atmospheric interference, so even taking (for example) the average of the reported position from all the services may not improve accuracy that much.
https://en.wikipedia.org/wiki/Error_analysis_for_the_Global_Positioning_System https://en.wikipedia.org/wiki/Error_analysis_for_the_Global_... is a good read.
- maxerickson 10y agoThe typical approach seems to be to consider all the visible satellites together (rather than solving for the position indicated by each constellation and averaging them). So in practice having more satellites means that a good position measurement is possible more of the time.
- kittenmittens 10y agoYou can also reduce some of the atmospheric interference by modeling it using both the L1 and L2 signal.