Perhaps in this new world of computing power and differing ways of achieving Fixed RTK, initialization, or Convergence, L1 RTK can work?
In the early days of RTK with L1 only, we had to initialize the rover over a known point or by using this 2 meter subtense bar hooked to the base. Very cumbersome and not very useful when initialization drops. With L1/L2, the delay between the two signals provides for modeling of the ionosphere and thereby allows for "On the Fly" Initialization. Do these new L1 RTK engines allow for OTF initialization? How?
To be most useful L1 RTK requires base and receiver to be capable of ranging from the fixed SBAS (WAAS) satellites, which definitely improves the initialization. That would have been the last series of Ashtech receivers. I do not know how that transferred over to Spectra Precision and if any other receivers have similar capability.
Soon you should see low cost L1/L5 capable receivers with meaned independent L1 & L5 solutions, rather than the more complicated, i.e. expensive, cross correlation of L1/L2.
Paul in PA
Paul, even though the Emlid RTK system is L1 only, couldn't you essentially model the ionosphere using the delay between GPS/Glonass?
Tim Reed, post: 413287, member: 420 wrote: Paul, even though the Emlid RTK system is L1 only, couldn't you essentially model the ionosphere using the delay between GPS/Glonass?
I think that delay calculations require a similarity of the broadcast timing clock systems.
BTW, SBAS (WAAS) satellites will also broadcast L5 corrections such that L5 ranging from SBNAS will also be possible.
Paul in PA
