Seems like the main difference in using GPS only and GPS+Glonass is that my recievers used to "float" with 7 satellites now with glonass they "float" with 11 satellites. Agravation factor very high trying to finish a topo within a given timeframe. Should I turn off some satellites? which one s?
The only receivers that use GLONASS in the solution are some of the new Javad ones (and that's if you pay the $1,000 dollar option for it).
At least that's what it says on Javad's website.
Mark,
What type of setup are you running? Base and Rover or Network. Trimble/Topcon/Other. If Network, what kind?
you should have some default settings where satellites are rejected (i.e., elevation angles <20d, poor geometric distribution, etc.) Beyond that, I'm confused as to why you'd want to reject satellites. At any rate, I sure wouldn't reject the GPS constellation for Glonass coverage
I replaced our GPS CORS sites in North Louisiana with GNSS receivers and antennas a few weeks ago because Land Surveyors up there wanted the capability in order to initialize quicker. The sites are: Sicily Island High School, Univ. of Louisiana at Monroe, Louisiana Tech in Ruston, LSU in Shreveport, and Northwestern State University in Natchitoches.
Personally, I don't think too much of that Russian stuff, but that's what our clientele want from the LSU Center for GeoInformatics.
www.C4G.LSU.edu
Just standard Topcon Hiper receiver with glonass option and 915 radio. 90% of the time it works fine then when you need it most it can't offer a solution (just my impatience but an hour wasted is too much). I know the Air Force is going to the 24-3 constelation to spread some sats out. I wonder if it would benefit or degrade a solution to turn off one of two that are very close to each other.
If you have to wait more than a few seconds the solution is likely garbage anyhow. That's pretty how much how RTK works.
if all else fails whip out your total station
> If you have to wait more than a few seconds the solution is likely garbage anyhow. That's pretty how much how RTK works.
LOL...any results that are faster than a few seconds of professional evaluation is likely garbage anyhow. That's pretty much how Bevis and Butthead with RTK work...
Hey Brooks...hold my beer :beer: :beer: :beer: :beer:
DDSM
(are you coming to ASPS' Mt. Magazine meeting? Come teach me about RTK...I'll share with you 'how to wind a plumb bob string)
😉
HAHAHA I'm kicking it around. I need to call and see how much it will take me to get in these days.
I'll bring you a Scrapper shirt if you'll buy me a beer 😉
GeoInfoSystematics?
> ... the LSU Center for GeoInformatics.
"GeoInformatics"! I know I missed the memo on that one, but that's great for Ver 2.0.
Ought one to assume that Ver 3.0 will be GeoInfoSystematics?
GeoInfoSystematics?
The Director is a Geologist. His center, his pick of names. It's about 10 years old.
🙂
RTK doesn't work in canopy. It gives answers but they are more often wrong than not.
I have found that if a unit keeps giving float solution that I could just turn the rover upsdide down to lose sats, and their turn back upright and it gets a fix. Leica 1200's used to give me that problem all the time. Hopefully this technique will help.
Well, since no one else said it, what time of day is it? Did you do mission planning? Just because there's a helluva lot of birds in the air, doesn't mean that they are at a poor geometry direction and your receiver won't solve it. Also, how many NAVSTAR birds are requisite to work anyway, and did you have that many with the russian birds?
Don't knock the gear if you haven't looked at all of the angles. We have GNSS R8's and they've been giving us hell lately. Did a little mission planning, and saw that yes, we were looking at 10 sat, 8 were russian and 2 were NAVSTAR. Won't work, I promise.