I used to work with CHCNAV i80 and it works well under canopies. I am thinking to buy another set of GNSS Receivers. thinking about buying Trimble R12, CHCNAV i90, or Trimble SPS986. which one do you think is better? can you suggest also other products with the same caliber?
thank you
Only used one of them...Trimble R-12 is great. I am sure i90 is fine too. Trimble Construction stuff makes no sense to me, so I would never buy one of those. Javad LS is also very high quality.
It is not clear if you still have the i80's, but if you do and they have not had the OEM (Trimble BD930 Firmware) updated in a while, updating to V5.45 (might be no-cost) will make a heck of an improvement (assuming current version is 5.21 or earlier). The break point was 5.42 I think.
We use an R-10 and the R-10_2(R12 chip with upgraded firmware) and they both work great. I suppose it comes down to budget and software and application.
At the airport I'm surveying now, I have lots of detailed "words of a colorful nature" as I lose the sky between the metal hangars and the fancy firmware/processor can't keep up.?ÿ That being said, the technology is still evolving and works better than expected most times.
We have R10s (first model); they perform great but I was amazed when I tested the R12s. I was in between two large metal buildings and was able to maintain a repeatable fix until I was almost under one of the canopies.
what are your tolerances? I still have yet to get that "Sales pitch" performance in between or next to hangars unless I add lots of slop, and end up just using the SX10 to grab all the wonky stuff so its tight.
I just had everything set to the Access defaults. I wouldn't necessarily expect to be able to use GNSS where I was testing the R12s; I was pushing it to see how far I could go. I was in between the two buildings shown in the attached, which are about 85' apart as you can see; they're both at least 20' high. I was able to get repeatable positions until I was only about 3' - 4' from being under the building to the south.
Hey Lee,
Understood. In the first photo, that lower right corner is about the distances I am getting stuck with at times. The R12 does allow for the degrading signal to process the best recent fixes when you lose the birds, which is probably why for a brief time, when you were under the sheds, you were still getting a fixed solution. I do like that function of the R12 engine for sure.
If you are going to go to Trimble, I definitely recommend getting the R12 over the R10-2.?ÿ While you do get the ProPoint RTK engine upgrade with the R10-2, you will not be able to get any of the other upgrades that may or may not be available in the future for the R12.?ÿ Trimble has not let on what will be available, but I have my suspicions.?ÿ?ÿ
Update with photos:?ÿ R10-2 in action!
?ÿ
Don't forget a lot of how well it will work in that situation is where the base is. If I set the base in a field in a hollow that runs east-west I can survey up through the hollow really well with the R12 until it starts to turn to a different orientation (say north south, but even a 45 degree bend in terrain makes a big difference), then I need to move the base ahead - pretty much like a traverse (but way faster).
The R10-2 amazes me everyday.?ÿ Thick canopy may take a few minutes, but as long as the rod is static on a bipod, it doesn't take long to get fixed.?ÿ The key is in the base placement.?ÿ The base likes a full open sky to the horizon and the rover can be under a roof overhang up against the wall and get a topo shot.?ÿ The internal radios have performed quite well so far. Just today with the base up high on a hill, I took the rover 3 miles up a draw and over a ridge and still got a 3 minute observation in moderate canopy.
I'm certainly not repping for Trimble,(but several guys I worked with actually appear in their videos) but I think this shot had residuals of H 0.04 x V 0.08
that being said, just past this next to the big ol metal building,and tree trunk i got squat.
VRS base. its ok for TBC and other stuff, but I still enjoy and look forward to real glass on glass shots because you cant hide your poor technique in the GPS slop.
IMHO
@sub-d-vider For those of you with the R10-2/R12, so you get that point under canopy. Then what happens when you reset satellite tracking, leaving the rod in the same spot, using a bipod, to observe the point again? How is the repeatability? Getting points under canopy is great, but how accurate is it?
The H & V precision at the bottom or top of your screen doesn't necessarily mean that's how "good" that observation is. A repeat observation is what will help prove your position.
