Re: Using cgps to determine the satellite constellation

[David J Taylor]

Yo David!

On Mon, 18 May 2020 19:18:39 +0100
"David J Taylor" <address@hidden> wrote:

> By asking about the constellation showing in cgps, I meant /which/
> constellation - GPS, Galileo etc.

yes, that is exactly what I meant to, and what recent versions of cgps
do.  What version are you on?

> I can change the receiver using the u-center 20.01 Windows tool, but
> it's not responding as expected.

I don't use WinBlows, so I can't use u-center.  So I can make no
comment on their usage.

> The RX (u-blox MAX-M8Q-0-10) should
> have Galileo when configured, but while it will accept turning
> GLONASS on or off, it balks at enabling Galileo.

Depending on your u-blox model, that is documented behavior.

Did you do the ubxtool as I requested?

> Currently a mystery.

Did you read the PPP Howto?  This exact thing is explained.

RGDS
GARY


=======================================

Gary,

Thanks for your reply.

I'm using 3.17, so that feature isn't included.  Thanks for the screen-shot, 
that helped to explain.  Can I use a recent cgps with the 3.17 gpsd, or have 
the interfaces changed?

It wasn't the usage of u-center I was questioning, simply proof that this 
particular u-blox model does have the capability of changing 
constellations - at least to a degree.

Yes, the MAX-M8Q-0-10 capabilities do include Galileo (in specific mixes):

 
https://www.u-blox.com/sites/default/files/MAX-M8-FW3_DataSheet_%28UBX-15031506%29.pdf

The module is from a reputable supplier whom I trust, and supposedly this 
supplier gets directly from u-blox.  I appreciate there may be issues there. 
I also see that three GNSS is the maximum for that unit.

ubstool isn't included in the apt-get sources for the Buster release for the 
Raspberry Pi.

Unfortunately I have gpsd 3.17, so the ppp "will fail in strange ways" 
according to the doc.

I'm working to provide a module ready to install on an existing Raspberry 
Pi, having configured the GPS module in Windows.  It's good to know that 
once configured gpsd will use all the available data, so I don't need 
further checks on the RPi itself, nor will I be adding or upgrading it from 
the default configuration.

Thanks, again, for your help.

Cheers,
David
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