MeanEYE t1_iwpuwi9 wrote
GPS also supports high precision, but that's locked for military support. Business gets more accuracy but not as much. With Galileo system it's even better and goes down to < 20cm, already at service level 1. So am not finding their accuracy all that impressive considering there are systems in place which already offer same.
Industrial_Jedi t1_iwpwulq wrote
Survey grade GPS can get you in the single digit cm range if you want to spend the $$$ on equioment. The problem is that they may take a few minutes to get there, so it's impractical for things that are in motion.
surveyorandrew t1_iwrq2yu wrote
We can do survey-grade observations while in motion using RTK, the only caveat is you have to maintain satellite lock otherwise you have to re-initialize. The systems are sophisticated enough now that it isn’t much work to setup. Some of my favorite projects I’ve done involved mounting a RTK GPS to an ATV/quad and driving back and forth across a 400-acre farm for a topo survey, with the GPS automatically taking shots every 20 feet. I’d say the more efficient way to do it nowadays would be with drone photogrammetry.
[deleted] t1_iwpxrl7 wrote
[removed]
marigolds6 t1_iwr64wn wrote
It's not that the military code is high precision and civilian is not. M-code is just there to provide a standalone alternative to civilian band that is more resistant to jamming.
Differential gps and WAAS provide sub-centimeter accuracy with civilian bands.
Salisen t1_iwu46mg wrote
Only after long averaging times, suffers from multipath effects and is vulnerable to cyberattacks, missiles, etc.
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