roaming | thefarmers - 5/22/2022 17:34
I thought sbas is the correction signal for waas. Thought dgps was the correction signal used before sbas., but I was never real clear on some of these terms.
DGPS (technically should be "DGNSS" since "GPS" is technically the US system and "GNSS" would be the generic term) is the "largest" category, and includes any correction signals that compensate for the difference between "real" and "calculated" position. If you don't have DGPS then you're running an uncorrected DGPS/DGNSS signal and your accuracy is not going to be reliable for much more than general automotive navigation.
SBAS is one kind of DGPS, and in theory includes any satellite-based correction signal. WAAS, EGNOS, OmniSTAR, RTX, TerraStar-L, TerraStar-C, etc, are all different flavors of SBAS, although in many contexts SBAS specifically refers to WAAS.
GBAS is a "ground-based augmentation system", where the corrections are broadcast or sourced from a ground station. This would include the ancient Coast Guard Beacon signal, as well as any radio or cellular RTK signal. |
Is there a difference between WAAS and SBAS?
