RTK surveyor accuracy?

GPS/GNSS
1

I have a few questions….

  1. Shouldn’t this get to sub cm accuracy?
  2. I’m connected, and receiving corrections from CORS in my state, but still not even getting the 10cm light
  3. Should I connect the RTK surveyor directly to the CORS Ntrip?

My surveyor is currently sending info to my tablet, via bluetooth, and the application on my laptop is handling the cors corrections.

We haven’t been able to get the wifi connection to work reliably….that’s another issue. I could use the hotspot on my phone, but we can’t get it to connect. Changed my local wifi to support more IOT devices, then it connected to that, but not after a reboot for some reason.

Can anyone send me in the right direction?

2

  1. It should get to ~1.4cm in ideal situations with a base within 10km

  2. How far away is the CORS base station being used for corrections?

  3. Sure - have you poked through Quick Start - SparkFun RTK Product Manual

    Are you on android or iOS?

3

Welcome @njxc500 !

Add as much detail about your setup as possible. There’s likely people here with very similar setups that can provide some hints.

What State Network, phone model, data collector app on tablet, NTRIP client, etc.

A very common issue is the requirement to use BLE if you have an iPhone (quick setting change on the Surveyor).

SW Maps (& it’s NTRIP Client) with a BLE connected iPhone is my preferred setup to get started (no tablet).

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4

I don’t see the RTK light…ever.

I don’t know which base station it’s using ofr corrections.

Yes, I’ve looked in the manual.

Android.

Thx.

5

I’m using a program called subsurface maps. My Samsung Galaxy a9+ tablet is connected to the rover via bluetooth. Subsurface has the ntrip login information on it.

I’m using MN state system, MNCORS.

I will try on my phone with SW maps, I have not tried that yet.

6

That’s a white-labeled Diamond Maps, so you shouldn’t have any problems.
What does Subsurface/Diamond Maps tell you when you connect to the mountpoint for MNCORS in the NTRIP client ?

7

It allows me to select a mountpoint….I’m not even sure I’m picking the right one because there’s very little documentation on MNCORS.

After the connection, it starts, and I see a bitrate for corrections at the bottom.

8

Ah… screenshot the MP list and we will help ya.

Or, login with SW Maps and you can see the Baseline Length. Might be able to with Subsurface also (IDK).

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9

RTKsurveyor
RTKsurveyor1920×1930 251 KB

10

Here is a collage of info that I’m seeing….any clues? Also I notice that “E” and “B” satellites aren’t used?/greyed out kindof.

11

Select the RTCM_34_NAD83(2011) MountPoint and give it a spin.

The press GNSS Status, you should see the baseline length at the bottom.

Also, EDIT the NTRIP setup to make sure you’ve turned ON the slide button “Send NMEA GGA to Caster”

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12

The CMRx MountPoint that you were using is a proprietary correction format used by Trimble receivers. The SparkFun Surveyor uses a U-Blox F9P chip.

13

I’d assume it’s using the closest, or VRS from several of the others.

The uBlox and Quectel want the RTCM MSM so either the RTCM 3.1 or 3.4 forms which mostly would be the supported constellations, as each has it’s own MSM message

Presumably the AG and NAD83(1996,2011) with slightly pulled 1005 type antenna position variations for them.

Yeah, the CMR variants will be unworkable with the SparkFun boards, except probably the Septentrio based ones.

https://customersupport.septentrio.com/s/article/CMR-messages

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14

Thx for the explanation…..that explains it. After selecting the other mount point, I now get RTK fix, and 1.0cm accuracy.

Thanks much!

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