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Working RTK Base Station for less than $1,000
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nnielsen
Posted 5/25/2024 03:50 (#10750699 - in reply to #10747778)
Subject: RE: Working RTK Base Station for less than $1,000


New Zealand		I have only done this on an fmx in the past, but here are the rough instructions:

1: Park out in your yard somewhere with a good clear view to the sky. you must be able to get the corrections from your base into the display at the location where your park. I assume you use some kind of cellphone modem to do this.

2: This one is important: Set the FMX up to use manual guidance (disable autopilot). If you do not use manual guidance, the Navcontroller will interfere by trying to apply roll corrections and direction adjustments. These will jump around when you swap correction sources. With manual guidance you are only using the measurements from the antenna on the roof.

Do not move the tractor at all until you have finished

3: Open a field and let the FMX converge fully on RTX
4: Once it is converged, take a picture of the gps disgnostics page (the one you just sent a picture of)
5: from the run screen, press the "pause" button
6: Without moving the tractor, switch your correction source to your mosaic base station
you should see the distance to pause increase once it has swapped corrections.
7: Once you have a fix from your own base and had it for a minute, take another picture of the gps diagnostics page

The coordinates should be different in the last numbers for N and W
This is all you have to do in the tractor for now but if possible, leave it there without moving it.

8: Go to where your base is set up and you can change the settings.
9: To find out how much you need to alter the coordinates in your base, you want to do the following calculation on the DMS coordinates from the diagnostics page: Coordinate from RTX (minus) Coordinate from your base.
(the degrees and minutes should be the same, so it is likely just the seconds you need to do the calculation on)
You have to do this for both the N and W coordinate. The results will be the errors you are having.

10: If both degrees and minutes are similar in both coordinates, divide the results for N and W with 3600. This will give you the result in decimal degrees.

11: In your base station setup screen, take a picture of the coordinate you have your base set at at the moment (I believe this is set in decimal degrees). And at the status page where it displays the current coordinate in degrees minutes seconds
12: Add the results from step 9 to the coordinates in the base setup (in geodetic1 I guess)
13: Save the settings, and save to boot in the popup box
14: Go back to your tractor and get a new RTK fix from your base. If you were successful, the coordinates should now match with the first picture you took of the RTX fix. If the coordinate is not the same, but now have the double difference compared to step 4 and 7, I probably got things in the wrong order. you then have to go back to your base again and subtract the results from step 9 from the values you have in the picture from step 11 (instead of adding them).

15: If everything fails, basically you just need the FMX to get the same coordinates on RTX and RTK. you can also do this by change one number at a time until the FMX coordinate matches. If the coordinate has to be a larger numver, increase the value on your base. And decrease the number if the coordinate has to be smaller. Adjust N first, then W.

You can still upload the pictures here and I'll look, but I have a feeling you will be more satisfied if you get it to work by doing the numbers yourself :-)

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