RTK fixed, RTK lost

Paul...

Looks like a Cypress

A wet cedar grove cam actually shut down any GPS.

The pines around here have needles that are the right length to mess with the wavelength and will disrupt short setups.

A tall HI and long multiple setups will get a usable solution under dry conditions.

0.02

I always do a static observation on questionable shots, but I use a base and rover, hiper lite + with 4mb ram. I guess you could do it with a network setup like yours, if you have storage memory on your receiver, and cors stations are close enough. When it fixes, I will store it and stake out the stored point for comparison. Opus-RS might be helpful, also, but a short observation usually won't work very well under canopy or in marginal areas.

Paul...

ditto

Thanks, everybody! I picked up some gems while reading through the comments. I will incorporate many of these in my normal operations from now on. I do about half of my work with base and rover, and the other half with my cellular network rover.

The Okolona CORS station near my house was installed by the National Weather Service to measure moisture in the atmosphere. At last check, it was no longer operating.:-/

Stephen is correct. Cell Tower

Stephen was correct. It is a cell tower. Concrete trunk and limbs are steel and leaves are aluminum.
I wonder why it doesn't cause interference. It was put up about 15 years ago.

http://www.waymarking.com/waymarks/WM4CVY_Mandevilles_Disguised_Cell_Tower

Concrete Power Pole

It is the rectangular array of internal rebar (possibly wire mesh) that can give more problems than a steel pipe tower.

That cell tower has much fewer antenna than the ones I've seen on the Garden State Parkway, usually at least three tiers. In any event, a single tree, real or imagined, does not a forest make.

Paul in PA

:good: :good: :good:

I don't even waste time hoping when a pine tree is involved. It is a crap shoot or I need so many multiple checks that I'm better off switching to total station.

Pine trees

We might find a few under 30-feet high that were intentionally planted in yards. Other than that, the only ones we see have Christmas decorations on them somewhere inside the house.

Hi,

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Been using my RTK Topcon Hiper Sr for six months now. and just this morning it stop connecting upon setup, My rover wont find the Longlink bluetooth of my Base even though they are just few meters away.. Any ideas on how to fix?

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thanks in advance!

Chinosky

This thread has some good stuff in it. Even Kent has a few gems.

Nate

Yeah, I knew trees were bad but I didn't know pine trees were especially bad.

I've been burned on a group of about 20 points with a bad fix once so far and I've tried keeping a closer eye on the RMS stats since then, but I've realized there is only so much babysitting I can do before I may as well break out the robot.

It'll be interesting to see how the technology improves over the coming years.

If you not tried to clear the Non-Volatile Ram, aka NVRAM, I would suggest doing that on both receivers.

If that is Magnet as it appears to be, after connecting to first the Base, go to the Set Up menu and select Status.?ÿ Tapping the Magnet icon in the upper left-hand corner of the display will access a pull-down menu.?ÿ On that pull-down menu you will see the option "Clear NVRAM"?ÿ?ÿ

Initiating this action will cause the receiver to flush its reference position and the ephemeris it has in memory as well as restoring default settings.?ÿ You will need to give it a few minutes to collect a new broadcast ephemeris.?ÿ Do this with both receivers to assure best results.?ÿ While you are waiting for the receivers to resume normal operation, you may as well reboot the data collector as well.

On another note, if you find the display hard to read in outdoor conditions, from the Main Menu page in Magnet, select "Configure"

under the Configure menu select "Global"

In the Global settings screen, at the bottom of the items on that page, you will see "Color Scheme"?ÿ - there will be a window to the right that should say "Dark" based on the way your display appears in the picture.?ÿ Click on the pull-down arrow at the right of that field to select from one of several pastel colored backgrounds for your Magnet software.?ÿ This does not change any other settings but it should really improve visibility of the display when you are outdoors.

This thread is over four years old now! Wow, how time flies! Much has changed for me in the past four years.

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A couple of days ago, @BStrand made the comment:

It'll be interesting to see how the technology improves over the coming years.

Four years ago, I made the comment:

As to fooling receivers, I've certainly not handled them all, but I have seen every receiver I've test report a bogus fix. I'm holding out hope in a new receiver that reportedly has tremendous redundancy built into the solution, but until I test it, I remain skeptical. The best advice I can give is to build redundancy into your system, particularly on critical shots. Test your receiver in practice scenarios and learn to read other indicators beyond fix and float.

The receiver I was alluding to back then was the Javad Triumph-LS. At the time, I knew it had six RTK engines. But I did not know where the development would go from there. Today, Javad has automated many of the processes good surveyors use manually with other RTK equipment every day. Redundancy is now achieved at the press of a button. When I wrote this four years ago, I had some idea of the other indicators beyond fix and float that surveyors should be mindful of, but I had no idea of the information available to LS operators today.

I also mentioned that Glonass may not be as useful in canopy as some might think. This is because the system I was using in my practice at the time would not use Glonass to acquire a fixed solution. The receiver would fix using only GPS, then would add Glonass to the solution to help maintain the fix. Today, many receivers actually acquire a fixed solution using satellites from various constellations. I've actually used the LS to acquire a fix using only Glonass. So other constellations offer more improvement today than in previous years.

In November of last year, I made this short video of the Triumph-LS working on a point that was at the East base of an 8" pine tree, with several trees all around. This demonstrates how the LS achieves this redundancy automatically.

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Perfectly documented!

thanks for sharing here,

Is the same workflow possible when working in a VRS solution? I suppose this system here was connected to your own base.

Christof.

Thank you Christof. Yes the same process works with VRS as well. Here I was using my own base.