T2 with WAAS

[JVan]

Please excuse my partial knowledge of GPS, I'm a geophysicist not a Surveyor. I'm trying to run my T2 using WAAS corrections. This is how I have the positioning setup:

In this mode it only uses GPS satellites in the positioning, not GLO or SBAS satellites:

If I change the Position Computation Mode to cd, it uses GLO and SBAS satellites, but the solution is StandAlone and the SEP goes up:

I don't understand why this is.

 

[Matt Johnson]

You need to enable SBAS solutions:

 

[JVan]

Thanks Matt.
According to the ToolTip for Enable SBAS Code Differential, "This parameter doesn't affect behavior of receiver running in cd, wd, or sp modes." Nevertheless, I tried it:

No change in the position:

 

[Matt Johnson]

In your last screenshot it is showing a DGPS solution.

 

[JVan]

Yes. I guess I'm wondering why SBAS corrections turns off GLONASS satellites. Kind of negates the GLONASS option I bought.

 

[Matt Johnson]

The WAAS satellites only broadcast corrections for GPS satellites I believe so this is why they aren't being used for DGPS positions.

 

[Shawn Billings]

I agree with Matt. If you have corrections that include GLONASS, then I suspect these corrections would be used with GLONASS by the Triumph-2. If the corrections do not include GLONASS then there is nothing to add to the DGPS solution as there is no "D" (i.e. differential).

 

[Zoltan Varga]

Hello,
Is the accuracy of SBAS positioning published somewhere ? On the data sheet I can find only "DGPS accuracy", but I do not know if this is RMS, CEP, R95 or else. Not clear if this is for base-rover kind DGPS, or for SBAS DGPS.