TangoGPS and GPSD

Joerg Reisenweber joerg at openmoko.org
Sun Jul 6 21:26:51 CEST 2008


Am So  6. Juli 2008 schrieb Harald Koenig:
> On Jul 06, Marcus Bauer wrote:
> 
> > On Sun, 2008-07-06 at 19:17 +0200, Bernhard Höll wrote:
> > > Hi,
> > > 
> > > unfortunately I still get no GPS data. I went for a 25 minute trip on a
> > > plain field, so GPS reception should be no prob. .
> > 
> > My Freerunner needs ~5 minutes before it has the time (tangoGPS displays
> > the time of the GPS even if there is no fix) and ~10-15 minutes overall
> > before it gets a fix. If I move, even just walking or have the Neo not
> > in an upright position, I don't get a fix at all. Clear skyview of 80%
> > sky is necessary for my FR too.
> > 
> > 
> > > When connecting via 'nc' to the gpsd I get output
> > > "
> > > GPSD,R=1
> > > $GPRMC,,V,,,,,,,,,,N*53
> > > $GPVTG,,,,,,,,,N*30
> > > $GPGGA,,,,,,0,00,99.99,,,,,,*48
> > > $GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*30
> > > $GPGSV,1,1,00*79
> > > $GPGLL,,,,,,V,N*64
> > > $GPZDA,,,,,00,00*48
> > > $GPRMC,,V,,,,,,,,,,N*53
> > > ...
> > > "
> > 
> > The above log data means that the GPS chip has just no clue about its
> > whereabouts.
> 
> check this mail thread for details:
> 
>       http://lists.openmoko.org/pipermail/hardware/2008-April/000055.html
> 
> this explains that there is a problem with the internal antenna.
> the gps receiver detects a shortage and disables the antenna :-(
> 
> same problem with my new gta02 :-(

I don't understand Andy's findings that way.
Seems more like GPS-receiver can't even switch off antenna at all. The whole 
story about Vcont is just switching between internal and ext. ant., and is 
done by a separate chip (UPG2012TB).
No way to switch ant. off for ublox-receiver

/j
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