GPS

[Mathias Ballner]

hi all,
today i tried to get the gps running, but i didn't get a gps fix
i tested it with tangogps (nice tool!) and openmoko-agpsui
the only output i got was:
$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

$GPVTG,,,,,,,,,N*30

$GPGGA,,,,,,0,00,99.99,,,,,,*48

$GPGSA,A,

http://scap.linuxtogo.org/files/6d11990f0c82d92f0252742d7ef44950.png
what do i do wrong?
mathias

-------- Original-Nachricht --------
> Datum: Mon, 7 Jul 2008 15:37:08 +0100
> Von: Al Johnson <openmoko at mazikeen.demon.co.uk>
> An: community at lists.openmoko.org
> Betreff: Re: GPS

> On Monday 07 July 2008, Kai Römer wrote:
> > Hi Al,
> > If you need testers, please contact me. I have several gta02v5
> > available and can do tests in Germany Munich.
> 
> First stab uses the example perl functions from ublox for generating the 
> aid-ini data, replacing their hardcoded x,y,z with values for my location.
> The copyright notice on the example code says you can't do anything with
> it 
> without permission so I can't give you the script, but I can tell you how
> to 
> reproduce it ;-)
> 
> Get the AssistNow online client application note from:
> http://people.openmoko.org/matt_hsu/ImplementationAssistNowServerAndClient(GPS.G4-SW-05017-C).pdf
> 
> Create a new script aid-ini.pl and start with:
> 
> #!/usr/bin/perl
> print(clientdata_prepare());
> 
> Go to section B - Sample Server implementation and append subroutines 
> clientdata_prepare and ubx_checksum to aid-ini.pl
> 
> You need to replace the $posx, $posy and $posz values in
> clientdata_prepare 
> with some that match your location. These are ECEF coordinated in m.
> There's 
> an explanation of the calculation method in:
> http://www.u-blox.com/customersupport/docs/GPS.G1-X-00006.pdf
> 
> Alternatively you can use the attached spreadsheet if it survives the
> list. 
> Just replace the lat and lon with values for your location.
> 
> You probably want to change the time accuracy to reflect the accuracy of
> the 
> Freerunner clock, and possibly the accuracy of your location estimate.
> 
> Now copy the script to somewhere suitable on the Freerunner and make it 
> executable. I'm using /usr/local/bin. You need to install perl if you
> don't 
> have it already:
> opkg install perl
> 
> Switch on the GPS then run the script:
> /usr/local/bin/aid-ini.pl > /dev/ttySAC1
> 
> If you cat /dev/ttySAC1 you should be able to see it using the current
> time 
> according to your Freerunner. TangoGPS makes it easier to see what it's 
> doing. In the only test I've managed so far it got a fix with a poor view
> of 
> the sky, while my Garmin Geko was still struggling to see 3 sats. It
> wasn't 
> quick, but it was better than the Garmin. It would be interesting if you 
> could try 2 units side by side, one with aid-ini and one without, to see
> if 
> it really makes a difference or if I was just lucky. I'll try to get some 
> more testing in, but the weather isn't good here, and I don't want to get
> my 
> new toy wet ;-)

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