> 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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