GPS error: (None, None) coordinates

[fstaine]

Hello,

I am using a Pytrack with my FiPy, and trying to get a location with the L76GNSS lib provided by Pycom.

When getting coordinates, the method always gives me empty data, even after 20 minutes. I tried indoor and outdoor, always the same results.

Is there some kind of initialisation that must be done before ?
Does someone have the same issues ?

Edit: I have two FiPy/Pytrack at my disposal and they both gives the same output.

Thank's

[jmarcelino]

Hi @fstaine

GPS indoors will just not work and outdoors you need clear view of the sky.

Perhaps that's the problem?

[crumble]

Without any additional hard-/software?
Have you tried to print the sentences read from the GPS chip?

[fstaine]

Thank's for your replies !

I though that the module couldn't catch signal for indoor, and this is why I tried outdoor. I had buildings around me but clear a view of sky for about 20 minutes and still no data.

I've tried printing the frames, and I only get invalid data:

'$GPGLL,,,,,000200.800,V,N*70\r\n'

• V means invalid data,
• N means no fix for GPS

I started digging into the protocol specification for L76 device and saw multiple commands to configure it.
Do you know some that may help getting better signal ? (I found Active Interference Cancellation for example, but it is activated by default).

Thank's again !