|
|
|
|
|
|
by brandmeyer
1336 days ago
|
|
|
> Regular GPS precision due to ionosphere changes is too low. ... for single-frequency receivers. Military receivers have been dual-frequency for a long time. GPS L2C's rollout is pretty slow (and L5 is even farther behind), but Galileo and BeiDou are both fully operational with dual-frequency civil signals right now. All dual-frequency receivers can naturally cancel out the effect of the ionosphere. That's part of why some smartphone baseband chips are coming out with L5 capability: GPS L5, Galileo E5A, and BeiDou B2A all operate in the same spectrum. |
|
|
"The Apple Watch series has always offered GPS support (in addition to other global satellite navigation systems), but the Apple Watch Ultra is the first to come with dual-band GPS (L1 + L5). Most smartwatches on the market, including the Galaxy Watch 5, only support single-frequency GPS and can only receive satellite signals on the L1 frequency. Dual-frequency support allows the Apple Watch Ultra to lock onto L1 and L5 bands simultaneously. This greatly improves navigational positional accuracy and reduces multipath errors in urban areas and other challenging environments."
https://www.xda-developers.com/apple-watch-ultra-gps-support...