3 ms·
No, those markers work by listening to the GPS signals for an extended period of time and maybe PPK or perhaps an alternative network that's not satellite based
by tinco 7y ago
No, those markers work by listening to the GPS signals for an extended period of time and maybe PPK or perhaps an alternative network that's not satellite based.
- supermatt 7y agoSo it would be regular GPS assisted with some basestation at a known location to boost accuracy, as opposed to GNSS (Galileo)?
- tinco 7y agoYes, I'm not in land surveying myself, but my company builds georeferenced 3D models of buildings at high resolution and sub cm precision, and we never rely solely on GPS information. There's too many things that can go wrong with GPS to reliably fly a drone around a building for example.
- AnssiH 7y ago"GNSS" just means satellite positioning systems in general, and e.g. "GPS" and "Galileo" are examples of GNSS systems. At least regular receivers (e.g. in phones) utilize signals from multiple satellite constellations simultaneously, not sure if this is the case here as well.
- jhayward 7y agoYes, exactly. They use the signal as received at a nearby marker previously surveyed with high accuracy to calculate a local 'correction' to the GPS/GNSS signal, and give that correction to the roving units.