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Cedar Rapids, Iowa | A receiver will use whatever is available to produce the most accurate solution possible. A Glonass-enabled receiver that is configured to run on WAAS will be tracking the Glonass satellites, but they won't be used in the solution so long as the WAAS data is good and there are a sufficient number of GPS satellites available. If the WAAS data stream were to be interrupted long enough that it drops DGPS and goes to autonomous, then the receiver will start using all the satellites in the position solution. WAAS (GPS-only) is almost always better than Autonomous (GPS+Glonass).
The JD SF3000 is Glonass enabled and Glonass correction data is included in both the SF1 and SF2 data streams. If you have a SF3000 rover on RTK and have a SF3000 base, they will use the Glonass satellites in the RTK solution. However, if that SF3000 rover is getting RTK data from an iTC base (GPS-only), then the RTK solution will be GPS-only. The SF3000 will still be tracking the Glonass satellites, but they aren't that useful without any correction data, compared to GPS satellites with RTK quality correction data.
OmniStar offers a service known as G2 that has accuracy similar to XP, but includes data for both GPS and Glonass. I've tested it on a MR10 a year ago, and it behaved exactly as advertised. I recall the receiver tracking 21 satellites at once, and Russia has launched a few more into orbit since then.
-Lance | |
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Will Glonass help with WAAS accuracy?
