Yes, we did it. In fact, we started by do it! But it's manual, so wze wrote a python script to automatically run some test. Antenna was also tuned, inside the plastic enclosure, with a VNA. We had checked also that in normal case, we have enought sensibility.
But, it seems that sometimes, we have more than 3 or 4 SV in tracking, and after more than few minutes, we don't have a fix;
It's strange, because with 3 SV (C/N>25), we should get a the 2D fix, and with 4, a 3D fix.
Another strange things, it's that when I send a COLD start ($PMTK103*30\r\n) (with Init frame sent, sometimes I get the fix in 2s, that it's very strange for COLD start, it seems be more an HOT start, isn't it? I can have like a cold start only I send the FULL COLD START command ($PMTK104*37\r\n). Is it normal ?
We think that perhaps, we didn't have the right init sequence: we found only few documenations about some advanced functionnality, like for the predictivity, we the description is very short. I think that perhaps theses functions are not initialized on the right way...
Do you have any idea of what could happen ?
Thanks to you