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Old 02-13-2013, 09:46 PM   #1 (permalink)
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Default Most accurate RTK system???

Hi all, I'm looking for numbers that would compare Trimble, J-D and Topcon RTK systems. In their ad they all say less than 1'' accuracy from pass to pass.

It use to be showed as less than 1'' 70% of the time for example or 85% etc...

I tried to find those numbers but couldn't find them. Just wondering if one of you would have them somewhere...

I ain't shopping for a system but would just need those number for a presentation I have to do on land leveling.

Thanks!
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Old 02-13-2013, 09:59 PM   #2 (permalink)
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Shouldn't they be all equal and exact?
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Old 02-13-2013, 10:06 PM   #3 (permalink)
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I'm trying to setup a trial this summer with some friends comparing a couple gps systems to a laser for land leveling. From what we've seen they aren't all the same. For guidance they probably don't have any difference but it is harder to have real good precision when measuring height.
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Old 02-13-2013, 10:12 PM   #4 (permalink)
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Are you working with your own base station(s)? Otherwise you will have some inconsistencies depending on where each of the receivers are getting their correction signal from. From memory accuracy loss is approx 1cm/km from base station (or it certainly used to be in that ballpark).
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Old 02-13-2013, 10:56 PM   #5 (permalink)
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I know Trimble RTK is less then 1 inch accuracy for 95% of the time and here is a chart from a John Deere Manual -- Copied directly from a manual

Customers should experience errors at or below this level
50% of the time.
Pass to Pass Straight Track
Errors (inch) Low speed High Speed
SF1 4.8 5.0
SF2 2.3 2.7
RTK 1.9 2.3
Customers should experience errors at or below this level
95% of the time.
Pass to Pass Straight Track
Errors (inch) Low speed High Speed
SF1 14.2 14.7
SF2 6.9 7.9
RTK 5.7 6.8


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Old 02-13-2013, 11:29 PM   #6 (permalink)
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Thanks for the info! do you know if your info for J-D is with their new correction with glonass?

We use a base station that we carry in the field. That is definitely the most precise way for levelling. We compared it with RTK on cellular network and it seems like the information is too long to reach the receiver and the blade doesn't react as fast. Cellular network is awesome for guidance though so we use both systems...
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Old 02-13-2013, 11:37 PM   #7 (permalink)
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The information is directly copied from a Installation manual, without Glonass I believe

A surveyed Base is the best way to go for high accuracy, for leveling and water management their is a good reason almost every contractor uses Trimble, RTK accuracy is top notch and the vertical accuracy is also greater with Trimble over the deere system and I will leave it at that
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Old 02-14-2013, 04:55 AM   #8 (permalink)
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I would be interested in knowing the results of your trial. I have neighbours running Trimble GPS for lasering and I have been using the JD for only about 50hrs so far. Trimble guys have had problems with the system jumping up to 7cm then after a few hrs resetting. We haven't had any probs with the JD yet will keep you informed.
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Old 02-14-2013, 01:20 PM   #9 (permalink)
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Static Accuracy Testing | Lefebure


Lance lefebure did some tests on the static accuracy of a few different brands. Interesting read.

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Old 02-14-2013, 05:46 PM   #10 (permalink)
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I am the neighbour, haven't noticed this height issue he speaks of - he was certainly satisfied with the work I did for him using Trimble gear, - this is a rice growing area, if this problem existed - everybody would already know about it......
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