I've been in a conversation concerning the new GPS unit from Emlid. It's an L1 only RTK system. Someone there stated that "L1 RTK is okay as long as you are near the base station. You will always get the same accuracy as on L1/L2, but it's more fragile the further you get away from it."
Thoughts?
Here are the original threads:
https://www.reddit.com/r/UAVmapping/comments/5r0ut5/emlid_unveil_reach_rs_fieldready_rtk_gnss/
https://www.reddit.com/r/Surveying/comments/5r0xag/emlid_unveils_reach_rs_fieldready_rtk_gnss/
Many of the early survey receivers were L1, Trimble 4000ST's for instance were a huge seller in the late 1980's and is what I started with, we did a lot of work with those, just kept the baselines in the 10-20 km range (maximum). That said, there can be a lot of variations in chipset design and in particular antennas that could degrade the accuracy of a small L1 or for that matter L1/L2 receiver, but in theory for shorter lines L1 can be just fine.
SHG
L1 rtk is not a good solution.i have used promark3 rtk and i can say it is wasting money.in open sky area with good satellites over a 100 meters you loose your fix solution and you need to reinitialize .so today gnss companies do not produce l1 rtk receivers.you could only use it for static projects.
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there's a related reply in another thread:
https://surveyorconnect.com/community/threads/fwd-google-opens-up-gnss-raw-observables.327051/#post-379400